Recently, the Russian National Research University of Technology has developed a low-cost aluminum alloy that can withstand high temperatures of 400℃. Compared with other similar alloys, the bearing range is 100℃ to 150℃ higher. It is expected to greatly reduce railway transportation, aviation and Weight and carbon footprint of other equipment. In the context of carbon neutrality and lightweight, my country is also actively exploring the development model of "substituting aluminum for steel" to promote the development of the aluminum alloy industry.

Market scale of aluminum alloy industry

Due to the advantages of high temperature resistance, recyclability, and low cost, aluminum alloy has been widely used in various fields in recent years. The market size of the aluminum alloy industry in 2017 was 2011.118 billion yuan, and in 2020 it will grow to 276.553 billion yuan. It is estimated that the market size of the aluminum alloy industry will reach 299.755 billion yuan in 2021, and it will further reach 331.834 billion yuan in 2022.

In recent years, my country's aluminum alloy output has continued to grow. In 2016, the output of aluminum alloy was 74.5 million tons, and in 2020 it will increase to 9.64 million tons. From January to September in 2021, the output of aluminum alloy was 8.35 million tons, an increase of 19.2% year-on-year.

Development and research status of aluminum alloy materials at home and abroad

(1) Development and research status of foreign aluminum alloy materials

In general, the development and application of aluminum alloy materials in industrially developed countries has a long history, a good foundation, a strong research accumulation, a strong system of aluminum alloy materials, and a relatively high level of industrial technology. In particular, the United States, Russia and other industrial powers have carried out research and development of aluminum alloy materials earlier, and applied for a large number of aluminum alloy grades, which are widely used in automobiles, ships, aerospace and other fields, and have formed a certain degree of patent hegemony.

In the automotive field, aluminum alloy is an important material for achieving lightweight automotive. Regarding 2XXX series aluminum alloys, Rey Lufi Company of the United States and Sibenet Company of France have successively developed 2036-T4 and AU2G-T4 aluminum alloy plates for automobile bodies. With regard to 5XXX series aluminum alloys, Alcoa has developed aluminum alloys such as X5085-O and 5182-O for use in body inner panels. With regard to 6XXX series aluminum alloys, the United States has developed 6009 and 6010 body aluminum alloy plates. Norwegian Hydro Aluminum Company[2] developed HHS360 alloy in 2018. Compared with 6082 alloy, the tensile strength is increased by 10.8% to 360 N/mm2, and the elongation rate reaches 10%. Later, the company built on this basis. Developed HHS400 alloy, which has a compressive strength of 400 N/mm2, a yield strength of not less than 370 N/mm2, and an elongation rate of 8%. It is mainly used in automobile manufacturing. The United States' Kenlian Aluminum Company[2] developed the HSA6 series of alloys. The lowest yield strength of HSA6-T6 alloy extruded profiles is 370 N/mm2 and the lowest tensile strength is 400 N/mm2, which is different from the traditional aluminum alloy. 

Compared with the quality of all-aluminum cars made of materials, the weight can be reduced by more than 30%. At present, advanced foreign aluminum processing companies are committed to the development of low-cost automotive sheets. India's Novelis Aluminum Company has launched the AdvanzTM series alloy Ac5754R to further reduce the weight of the car. The company has also cooperated with Jaguar Land Rover Automotive Co., Ltd. to develop AC-170PX aluminum alloy with excellent forming and hemming properties [3] for use in outer panels of automobile panels. On the other hand, Okoninck in the United States has successfully developed a new generation of automotive sheet production equipment and process "Micro-Mill" technology, which has greatly improved the performance of aluminum panels for automotive bodies and panels, with a 20% increase in overall performance and a 30% reduction in cost. . At present, in the field of automobile body panels, 6082 aluminum alloy is the most widely used. In the front and rear anti-collision beams, many companies try to use 6XXX series or 7XXX series extruded profiles to prepare.

In the field of ships, the application of aluminum alloys on ships has gradually expanded. Early development abroad. So far, mainly 5XXX series and 6XXX series aluminum alloys have been used for ship hull and shipbuilding, respectively. In terms of deformed aluminum alloys [4], there are mainly: 5086 and 5456 alloys in the United States, 5083 alloys in Japan, N8 (5083) alloys in the United Kingdom, AMr6 (5A06), AMr61, B48-4 (01980), and K48 in the former Soviet Union. -1, K48-2 alloy. Russia has developed high-strength Al-Zn-Mg alloys (such as 01970, 01975 alloys, etc.) containing scandium (0.1% to 0.3%). In terms of casting aluminum alloy [4], there are mainly: the Soviet Union's BAП5, AП4M (ZL111), AП8 (ZL301), AП13, AП25, AП27 alloys, the United States 356 (ZL101), SEM328 (ZL106), 514 (ZL302), 515, 518 (YL302), 520 (ZL301), X250 alloy, etc. At present, the use of aluminum alloy materials in the marine industry is still mainly based on 5083 alloy and its improved alloys, making full use of its comprehensive advantages in corrosion resistance, welding performance, easy formability and mechanical properties.

In the aerospace field, modern aerospace aluminum materials are developing in the direction of high comprehensive performance, low density, large specifications, high uniformity and integration of power and structure. Aiming at 2XXX series aluminum alloys, Alcoa and Alcoa de France have developed 2026 and 2027 alloys with high strength and high damage tolerance [5]. Its extrusions (thickness 12~82 mm) and plates (thickness 12 ~55mm) are 20%~25% and 10% higher than 2024 alloy. With regard to 7XXX series aluminum alloys [5], Alcoa, Alcoa France and Aleris Alcoa have developed high-strength and tough aluminum alloys with low quenching sensitivity: 7085, 7140, 7081. In terms of ultra-high-strength aluminum alloys, Alcoa France has developed 7056-T79/T76 alloy, which has been used in A380 aircraft wing panels. In terms of Al-Li alloys, Russia has developed 1460 alloys, and the United States has developed Weldlite series alloys and 2097, 2197, and 2195 aluminum-lithium alloys. The United States Kenlian Aluminum Corporation has developed 2050 and 2198 alloys (Al-Cu-LiMg-Ag) with low density, high toughness and high damage tolerance properties. In 2010, American Kenlian Aluminum Corporation registered the Airware trademark for Al-Cu-Li series alloys. At present, the demand for aluminum alloy materials in the aerospace field is mainly concentrated in high-strength 2XXX and 7XXX series alloys, as well as low-density aluminum-lithium alloys.

(2) Development and research status of domestic aluminum alloy materials

Since the "13th Five-Year Plan", my country's aluminum production capacity and technical level have made great progress [1]. In 2019, aluminum production reached 5.252×107 t, ranking first in the world. my country has independently developed LC4, LC9, LY12, 2A12, 2A16, 7A04, 7B04, 7A50, 7B50 and other series of aluminum alloys[6,7], and established the first, second and third generation aluminum alloy material processing technology systems . In recent years, the properties of new high-strength and toughness cast aluminum alloys, third-generation aluminum-lithium alloys, and high-performance aluminum alloy profiles developed by my country have reached the international advanced level. In the "Chemical Composition of Wrought Aluminum and Aluminum Alloys" (GB/T 3190-2020), my country has added 29 domestic aluminum alloy brands in the past 10 years. Among them, Beijing University of Technology took the lead in the world to master the preparation and processing technology of erbium-containing dispersion strengthened aluminum alloys, and developed 5 alloy grades including erbium-containing 5E83 aluminum alloy cold-rolled sheet, 5E06 aluminum alloy hot-rolled sheet, and hot-extruded wall panel. Listed in the national standard [8], it has been applied in important fields such as national defense and automobile, and some varieties have replaced imported products.

Aiming at the extrusion forming process and equipment of high-performance aluminum alloy profiles, CRRC and universities have developed aluminum alloy refining, purification, and ingot homogenization technologies, and developed large-scale extrusion molds and equipment to enable the development of aluminum alloy profiles. The cycle is shortened by 25%, the cost is reduced by 15%, and the yield rate is increased to 62%. Northeastern University and Dalian Jiaotong University respectively developed continuous extrusion short-flow processing technologies for liquid metal, semi-solid metal and solid metal, and realized industrialization, reaching the international advanced or leading level in this technical field. Shandong Nanshan Aluminum Co., Ltd. has successfully entered the Boeing Company's global supplier list. China Zhongwang Holdings Co., Ltd. has successively acquired the controlling rights of German Una Aluminum Co., Ltd. and Silver Yachts Ltd., an all-aluminum superyacht manufacturer based in Australia. A large number of advanced weapons made of key aluminum alloy materials provided by Chinalco Northeast Light Alloy Co., Ltd., Southwest Aluminum (Group) Co., Ltd., and Northwest Aluminum Co., Ltd. appeared on the battlefield. In addition, Northeastern University, Shanghai Jiaotong University, China Aluminum Material Application Research Institute Co., Ltd., and Jilin University have reached international advanced or leading levels in high-strength and high-conductivity deformable aluminum alloys, aluminum alloys for automobiles, and cast aluminum alloys. At present, some aluminum alloy materials with my country's intellectual property rights have been used in automobiles, ships, aerospace and other fields.

Problems in the field of aluminum alloy materials in my country

It is worth noting that although my country’s aluminum alloy materials have achieved remarkable results in terms of industrial scale and technical level, the construction of my country’s modern industrial system started late and has a weak foundation. Self-sufficient. my country will be a major demand country for key basic materials for a long period of time in the future, and the demand for the number and types of such materials will continue to increase. However, high-end materials do not account for a high proportion of the industrial system, original innovations are relatively small, and basic common key technologies and intensive processing technologies are insufficiently developed. Alcoa has 30,000 patents. In contrast, Chinese companies have few original patents and hundreds of commonly used brands. However, China's own research and development are very few. At the same time, the consistency, uniformity, and stability of product quality are not high. . The quality stability of pre-stretched thick plates and skin plates for large aircrafts, and passenger car panels needs to be improved, and some high-end aluminum plates, strips, and foils still rely on imports. In addition, the extensive development of my country's aluminum alloy material industry is a serious problem. Although the industrial scale is growing rapidly, there is little research and development. The technological innovation of "production, study and research" integration is weak, and universities and enterprises cannot give play to the advantages of collaborative innovation. Therefore, it is very important to gradually promote the development of related research and industries to high-quality, high-innovation, and high-efficiency.

In the automotive field, my country's automotive aluminum alloy sheets still face three major problems: ① lack of automotive aluminum alloys with independent intellectual property rights, and high-end automotive aluminum has not been serialized, which makes it difficult to meet the individual needs of automotive companies; ② automotive sheet applications Insufficient construction of technology research and development platform. Research needs to be strengthened in terms of advanced forming, connection of dissimilar materials, low-cost and environmentally friendly parts manufacturing and surface treatment; ③The application of aluminum alloy profiles in new energy vehicles needs to be strengthened, and corresponding technological innovation platforms need to be established Develop related products such as body structure, electric drive system, battery tray, sub-frame, surface treatment, etc.

In the field of ships, my country’s marine aluminum alloys still have two technical bottlenecks: one is that there are few types of aluminum alloys for ships, and the overall performance and quality stability of the alloy are lower than those of the same brand in foreign countries; the other is aluminum alloy materials for ships. Application technology is mainly reflected in welding technology. There is still a gap between my country and foreign countries in friction stir welding and laser welding, which limits the development of aluminum alloys for ships.

In the aerospace field, my country still has a significant gap with developed countries in the R&D and application of aerospace aluminum alloys. The development of new alloys in my country is at the stage of imitation, and there are few alloy varieties developed; there is little research on the basic theory of alloying. There is still a certain gap between the quality stability and cost of my country's aviation material products and imported materials.

Market demand and development trend of various series of aluminum alloy materials

The market demand for aluminum alloys often determines the types, output and performance characteristics of aluminum alloy products. Due to the wide variety of aluminum alloys, the development process and status quo at home and abroad are not the same, and some aluminum alloys will be cross-applied in the fields of automobiles, ships and aerospace, so this part is classified and explained in terms of aluminum alloy series.

(1) 2XXX series aluminum alloy

2XXX (A1-Cu-Mg) series aluminum alloy has high tensile strength, toughness and fatigue strength, good heat resistance, processing and welding properties, and is widely used in aerospace, automotive and weapon industries. The main grades are 2A01, 2A02, 2A06, 2A11, 2A12, etc. A series of alloys, such as 2024, 2124, 2524, 2324 alloys, have been developed to improve strength, matching of strength and toughness, and damage tolerance. my country's equipment models are developing towards light weight, long life, high reliability, and low cost, and have higher requirements for the fracture toughness, crack growth resistance and corrosion resistance of the fuselage skin materials. On the basis of 2024-T351 aluminum alloy thick plate, foreign countries have developed 2324, 2624 and other high-damage tolerance aluminum alloys with different strength, toughness, fatigue, and corrosion resistance matching for the lower wing surface of the wing, and realized installed applications. We urgently need to carry out the development of high damage tolerance 2XXX series aluminum alloys. In the future, composite microalloying will be an important development direction of Al-Cu-Mg series high-strength aluminum alloys.

(2) 4XXX series aluminum alloy

At present, my country's automobile pistons mainly use eutectic and hypoeutectic Al-Si alloys, but with the continuous improvement of engine performance requirements, it is difficult to meet the performance requirements. Hypereutectic Al-Si alloy has low density, low linear expansion coefficient, higher wear resistance and volume stability. Compared with hypoeutectic and eutectic Al-Si alloy, it is a more ideal piston material. The eutectic Al-Si alloy pistons have been mass-produced abroad and used in trucks and cars, such as the A390 alloy in the United States, the AC9A and AC8A (ZL109) alloys in Japan, and the A390 alloy in Australia. However, at present, there are few manufacturers of eutectic Al-Si alloy pistons in my country, and most of them rely on imports. In addition, there is a big gap between automotive turbocharged aluminum alloy materials and foreign countries. High-performance automotive turbocharged aluminum alloy materials mainly rely on countries such as Japan. Therefore, it is imperative to develop key automotive aluminum alloy materials for high-performance pistons and turbocharged impellers.

(3) 5XXX series aluminum alloy

Al-Mg alloy, especially the Al-Mg alloy with high Mg content, has high specific strength, good weldability and corrosion resistance, and will become a very competitive material in the future aerospace, high-speed train, ocean and other fields. At present, Al-Mg alloy plates, profiles, and welding wires for aerospace, train, marine and other applications mainly rely on imports. The high-end welding wire market is basically monopolized by the US ALCOA. ER5183 and ER5356 alloys mainly rely on imports, and imports account for about its sales. 70%, Al-Mg alloy used in naval vessels is mainly dependent on Russia. Conventional ingots with high Mg content have developed dendrites, severe eutectic phase segregation, and poor forming performance. There are still many problems in current processing methods, such as low performance, poor apparent quality, long procedures, unstable quality, and low yield Wait. Sub-rapid solidification and forming can inhibit the precipitation of Mg, and at the same time can control and obtain fine equiaxed crystals and nano-precipitated phases, greatly improving the performance and uniformity of the material. Therefore, the development of high-performance Al-Mg alloy sub-rapid solidification continuous rheological extrusion and rolling technology is expected to solve the demand for high-quality Al-Mg alloy.

(4) 6XXX series aluminum alloy

6XXX series aluminum alloy materials are key materials in the fields of rail transit, automobiles, and electronics. Since the 1980s, developed countries and regions such as Europe, America and Japan have developed automotive aluminum alloys, and registered trademarks of 6009, 6016, 6010, 6111, 6022, 6082, etc., forming a relatively complete car body panel and extruded material , Forgings and other production and application systems. The industrialization of my country's 6XXX series aluminum alloy body panels and forgings has just started, and there is a significant gap. The automotive aluminum alloy sheets proposed by the Ministry of Industry and Information Technology of my country for the key development are: 6016-S, 6016-IH, 6016-IBR, 6A16-S, 6A16-IBR, 6022, etc. The elongation rate of typical 6XXX series aluminum alloy sheets is A50 Not less than 25%, r value not less than 0.60, 60 d parking yield strength Rp0.2 not less than 140 N/mm2, baking paint hardening yield strength increase not less than 80 N/mm2. In response to different needs, the development of the design, preparation and processing technology of 6XXX series aluminum alloys has become an inevitable trend of development.

(5) 7XXX series aluminum alloy

7XXX series aluminum alloy has good stress corrosion resistance, is the highest strength series of aluminum alloys, and is an internationally recognized aviation backbone material. Recently, 7055 alloy (Al8Zn-2.05Mg-2.3Cu-0.16Zr) has been developed abroad, which has a yield stress of over 620 MPa in the T77511 state, and is used in Boeing 777 aircraft, reducing weight by 635 kg. At present, my country’s aviation-used 7XXX series aluminum alloy lacks systematic alloy design and preparation and processing technology, and some products are totally dependent on imports. Because 7XXX series aluminum alloy large-size ingots have many alloy elements, wide solidification interval, large casting stress, easy oxidation/segregation of alloy elements, etc., the metallurgical quality of ingots is poor, and the room temperature formability is low. It is important to develop new 7XXX series aluminum alloys. significance.

(6) Aluminum lithium (Al-Li) alloy

Aluminum-lithium alloy is the most rapidly developed lightweight material in aviation materials in recent years. It has the characteristics of low density, high elastic modulus, high specific stiffness, good fatigue performance, corrosion resistance, etc. After replacing conventional aluminum alloys, the quality can be reduced by 10% ~20%, the stiffness is increased by 15%~20%. The American ALCOA company launched the "ALCOA Aviation 20/20 Plan" at the beginning of the 21st century. The goal is to reduce the cost and weight of aviation aluminum alloy by 20% within 20 years. Kenlian Aluminum has developed 2050 and 2198 aluminum-lithium alloys (Al-Cu-Li-Mg-Ag) with low density, high toughness and high damage tolerance. There are very few Al-Li alloy grades independently developed in my country, and only 1420 alloy has been used. The aluminum-lithium alloy used in the C919 passenger plane is provided by Alcoa. Only limited alloy grades such as 1420, 2195, 2197, and 2A97 can be produced in China, and the ingots are only slabs below ((310~400)×1280×4000) mm and round ingots below φ650 mm. In high-end aviation applications, slabs (2B16) with a thickness of more than 60 mm and a width of more than 1500 mm (2B16), and ingots (2B16) with a diameter of more than 1500 mm have not yet achieved industrial production. Therefore, it is of great significance to develop new aluminum-lithium alloy design, super large-size ingot preparation and deep processing technology.

(7) Heat-resistant aluminum alloy

Heat-resistant aluminum alloys can control Si, Fe, Ni, Ag, rare earths and other elements to make aluminum alloys resistant to oxidation and creep at high temperatures [9]. It is a key basic material in the fields of aerospace, automobiles, and rail transit. . Traditional heat-resistant aluminum alloys include: 2519, 2618, 2219, 2D70, etc. With the rapid development of the aerospace and automobile industries, higher requirements are placed on heat-resistant aluminum alloys. The new generation of fighter aircraft has a high cruising speed, and the working temperature of the fuselage skin is above 150℃. At present, the long-term use temperature of heat-resistant aluminum alloys such as 2618, АК4-1ч and 2D70 are all below 150℃. The development of new heat-resistant aluminum alloys is likely Must do.

(8) Al-Sc alloy with ultra-low scandium (Sc) content

Al-Sc alloy has excellent properties such as high strength, good plasticity, and corrosion resistance, and has become a new generation of lightweight materials for aerospace, ships, etc. after Al-Li alloy. The tensile strength of Al-Mg alloy containing trace scandium is 30% higher than that of 5083 alloy, and the yield strength is more than twice as high. Its weldability is equivalent to that of conventional 5XXX series alloys. The mechanical properties of the heat-affected zone and weld are approximately equal to those of the matrix, and the corrosion resistance is equivalent to that of 5083 alloy. The replacement of 5XXX series or 6XXX series alloys for aerospace parts can achieve significant reductions. It is also an excellent material for automobiles and rail vehicles. Russia ranks in the forefront of the world in the development of aluminum alloys containing scandium, and has formed Al-Mg-Sc, Al-Mg-Li-Sc, Al-Zn-MgSc, Al-Zn-Mg-Cu-Sc, Al-Cu-Mg- Sc alloy, the scandium content is 0.18%~0.5%. In order to promote the application of aluminum-scandium alloys in aerospace and automobiles, the Ministry of Industry and Information Technology of my country has selected scandium-containing aluminum alloys as one of the priority new materials for development. my country is rich in scandium resources, and a high-purity scandium oxide extraction production line has been built, laying the foundation for the development of aluminum-scandium alloys.

(9) 500 MPa class hot stamping aluminum alloy for automobiles

my country's hot stamping high-strength aluminum alloy materials are still blank. The combination of new materials and new forming process development is an effective means to solve the forming of high-strength aluminum alloy automotive parts. Focusing on 7XXX series alloys, actively exploring 2XXX alloys, and developing 500 MPa-class hot stamping aluminum alloy materials, which have important prospects for manufacturing complex-shaped automotive parts.

(10) Aluminum-based composite materials

Aluminum-steel multi-layer composite panel: The effective connection of aluminum and steel deck has become one of the restricting factors for the lightweight of the superstructure of large ships. The aluminum-steel composite transition joint used for welding between aluminum and steel hull provides a solution to replace the traditional riveting process. Honda has developed the joining technology of steel and aluminum, which will be applied to mass-produced car frames worldwide. At present, the aluminum-steel composite joints used in China are mainly imported from abroad, and the price is as high as 4×105 CNY/t. With the large-scale ships of the future, higher welding temperature, greater load-bearing stress, and stronger bonding interface are required for transition joints, and there is an urgent need to develop high-performance aluminum-steel joints.

Aluminum alloy composite materials for automobile radiators: Aluminum alloy composite foils, strips and plates are key materials for the manufacture of brazed heat exchangers such as automobile air conditioners, radiators, and hand dryers. The composite material is made by laminating and rolling 2~3 kinds of alloys. The coating layer is mostly high silicon alloy or low potential alloy, such as 4004, 4045, 4047, 4A13, 7A01 alloy, etc. The core material is mainly 3003, 3003 +1.5%Zn and 3004 alloy etc.

Aluminum honeycomb panel: usually composed of two thin and strong panels and a middle honeycomb core. It has the advantages of light weight, high strength, high rigidity, good stability, heat insulation, sound insulation, etc. It has been used in aircraft, trains, ships, etc. Used in. The existing products in the market are generally adhesive products, except for the imported materials for aviation, which are welded products. The panels are easy to be degummed in environments with high humidity, strong vibration, and high temperature. The development of light-weight, high-strength, corrosion-resistant, and brazable honeycomb structural panels and core panels is the development trend of honeycomb panels. Some foreign countries developed brazed aluminum honeycomb panels in the early 1990s, and developed high-strength, age-strengthened, corrosion-resistant, and brazable honeycomb materials. In the past five years, my country's honeycomb aluminum production has maintained an average growth rate of 22%. In 2012, the market capacity of adhesive honeycomb aluminum products in my country's construction market alone reached 7.674 billion yuan. It is estimated that by 2035, the demand for high-strength and corrosion-resistant honeycomb composite panels will reach 7×107 m2, and the prospects are very broad.

Development prospects of aluminum alloy industry

1. Policies are good for the development of the aluminum alloy industry

Compared with other metal materials, aluminum alloy has comprehensive advantages such as green, environmental protection, high efficiency, high precision and recyclability. In recent years, the aluminum alloy industry has been encouraged and supported by national industrial policies. Actively promote the new principles and new technologies of new lightweight and high-strength materials, and focus on the research and development of new lightweight materials/structure integration, intelligent, flexible design and manufacturing technology of advanced aluminum alloys, magnesium alloys, titanium alloys and other lightweight and high-strength materials Research and development. Actively promote the application of aluminum alloys, which is beneficial to the development of the aluminum alloy industry. The specific policies are as follows:

2. Lightweight automobiles promote the growth of demand for aluminum alloys

Lightweight materials are the most direct and effective way to reduce the weight of automobiles. Compared with steel, aluminum alloy has a lower density and greater potential for weight reduction; compared with magnesium alloy, it has a lower cost and a more mature forming process and connection method. In addition, aluminum has a large reserve, good corrosion resistance, and high recycling rate. Therefore, it has gradually become the mainstream material for automobile lightweight, which promotes the growth of demand for aluminum alloy and further drives the increase of aluminum alloy consumption.

The application of aluminum alloy in automobile lightweight mainly includes aluminum alloy forgings, metal die castings, aluminum alloy extrusion and drawing products, etc.

Cast aluminum alloy is the most widely used in the current automobile lightweight process. It is mainly used in automobile engine, chassis, wheel hub and other structures. The engine has been called the "heart" part of the automobile, in the cylinder head, cylinder block, piston, etc. The application of aluminum alloy to the parts can not only effectively reduce the overall weight of the engine, but also dissipate the heat generated in the engine work in a timely manner, and improve the working efficiency of the engine.

The weldability of aluminum alloy sheet is worse than that of steel during use, which improves the welding performance and welding quality of aluminum alloy sheet, and increases the application range of aluminum alloy. Application of hot forming technology, superplastic forming technology and electromagnetic coincidence forming technology to improve the formability and forming quality of aluminum alloy panels.

At present, in addition to traditional aluminum alloy metal materials, aluminum-based composite materials have been widely used in automobile lightweight manufacturing due to their advantages of low density, high strength, and high corrosion resistance. Compared with traditional cast iron pistons, automobile engine pistons reduce their weight by about 10%, while their heat dissipation performance is increased by 4 times. Restricted by price and production quality control, aluminum-based composites have not yet formed a large scale, but have shown their excellent performance on some auto parts.

3. The expansion of aluminum alloy application fields boosts the development of the industry

Aluminum alloy is the most widely used non-ferrous metal structural material in the industry. At present, the aluminum alloy industry has developed into a relatively mature market. As the low-carbon economy has become the general trend, due to the increase in market demand and the improvement of aluminum processing technology, the application of aluminum alloy in high-end fields such as new energy vehicles, high-speed rail, ships, and aviation has become more and more widespread. It is expected that the application of aluminum alloy The continuous exploration and expansion of the field will further promote the development of the aluminum alloy industry.

4. The pattern of aluminum alloy cable industry is gradually taking shape

As the market management of aluminum alloy cables is gradually standardized, the quality supervision mechanism is gradually improved, and the Ministry of Housing and Urban-Rural Development has vigorously promoted the gradual implementation of the five-party lifetime responsibility system (builder, designer, general contractor, constructor, and supervisor), and With the further popularization of aluminum alloy cable technology and product knowledge, it is believed that the proliferation of inferior and substandard products on the market will be effectively curbed. As a result, mid-range users will follow high-end users and truly choose and make good use of aluminum alloy cable products. Low-level users will definitely change their current demand for aluminum alloy cable products and choose aluminum alloy cable brands more rationally. It is certain that the brands of aluminum alloy cable products that are cost-effective and can guarantee safety and no hidden dangers in the market will attract more and more users' attention and inevitable choices. The aluminum alloy cable market has gone from a blank and difficult cultivation at the initial stage of promotion, to chaos in the mid-term, and now it has gradually moved towards rationality.

Young companies that have entered the aluminum alloy cable industry family are working hard to conquer aluminum alloy cable technology, improve production technology and technology, in order to produce qualified cable products as soon as possible. In addition to continuing to improve production technologies and processes and improve product quality and stability, some outstanding companies that entered the industry in the early stages are also actively using and absorbing advanced tools and thinking such as Internet +, working hard to practice the craftsmanship, taking the road of quality, and winning with quality. Seek healthy and steady development of the enterprise.

From the perspective of industry development and market trends, in the aluminum alloy cable industry, the company's future technological progress direction, quality positioning, and product matching requirements are already very clear. The level of product brand in the market has been basically clear with the baptism of the survival of the fittest, the composition of user groups, the distribution of needs, and the mainstream forces leading the market. Generally speaking, the aluminum alloy cable industry has entered a stage of gradual maturity, the development trend is basically clear, the development trend is basically healthy, and the road is tortuous, but the future is bright. The market management of aluminum alloy cables is gradually standardized. The market management of aluminum alloy cables is gradually standardized.

In today's rapid economic and social development, facing new energy crises and environmental problems, lightweight vehicles can effectively improve the fuel efficiency of vehicles, thereby reducing pollutant emissions. In the process of automotive lightweighting, magnesium alloys, aluminum alloys and other metal materials have been widely used due to their advantages and characteristics. In the future, technological improvements will be used to reduce material costs, increase material utilization, and develop environmentally friendly and feasible materials. Recyclable new materials are also an inevitable trend in the research and development of automobile lightweight.

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