The Application of Aluminum Alloys in Special Fields

1. The Application of Aluminum Alloys in Special Fields Abstract: The aluminum sheets are widely used in shipbuilding, fuel tank making, automobile manufacturing and airplanes. The alloy grades are usually from 5xxx, 6xxx, 7xxx and 2xxx like 5052, 5083, 5754, 5454, 6014, 7075, 2024,etc. Marine Grade Aluminum Alloys 5052 5083 The marine aluminum sheet is soaked in water all the year round and requires high corrosion resistance. The aluminum alloy 5052 is an Al-Mg alloy with excellent corrosion resistance and medium strength. It is suitable for the manufacture of economical aluminum alloy ships. In addition to being used in the hull, it can also be used in cable bridges, ship sinks, ship compartment floors and other parts on ships. 5052 aluminum sheet is a typical 5xxx aluminum alloy. The Mg content is 2.2%-2.8%. It has the characteristics of light weight, medium strength, good corrosion resistance and weldability, and easy processing and forming.

2. Among its mechanical properties, the tensile strength σb can reach 215-265Mpa, and the elongation δ5≥5%. Under different work hardening and heat treatment states, the mechanical properties will be different. Aluminum alloy yachts for freshwater lakes are mostly made of 5052-H32 or 5052-0 aluminum plates, while luxury yachts on the sea are generally made of high-magnesium alloy 5083H116 or 5083H321 aluminum plates. The thickness of the marine grade aluminum alloy plate is generally 3-30mm, and the thickness below 12mm is more widely used.

3. In the ship design industry, the 5083 ultra-wide aluminum plate in the state of 5083H116/H321/H112 is mostly used, and it is used in the main deck of the ship, the diesel engine pedestal, the side of the ship, and the outer side of the ship. 5083 h116 aluminum plate is the most widely used military and civilian aluminum alloy in the field of ships, and has broad application prospects in the fields of military speedboats and high-speed passenger ships. The content of Mg and Mn in the 5083 alloy is controlled at the middle and upper limits, which can ensure that the strength performance of the 5083 aluminum plate meets the requirements, and the plasticity and corrosion resistance of the 5083 aluminum sheet are also good at this time. Cr plays a supplementary strengthening role in the 5083 alloy, which can increase the recrystallization temperature, and Ti refines the cast structure. Special attention should be paid to controlling the content of impurities Fe and Si. When the content of Fe is high, the plasticity and corrosion resistance of the alloy will be reduced; compared with Fe, si has a greater negative impact on plasticity, and the mass fractions of Fe and Si should be controlled below 0.25% respectively.

4. Automotive aluminum alloys The density of aluminum is small (2.7 g/cm³), which is about 1/3 of steel (7.8 g/cm³). Replacing steel with aluminum alloy can reduce weight by about 50%. Since the surface of aluminum is easily anodized to form a dense and stable oxide film (passivation), it has good corrosion resistance. Aluminum has good castability. Because aluminum has a low melting temperature and good fluidity, it is easy to manufacture parts of various complex shapes. Aluminum alloys are formed by adding one or several elements to aluminum. Aluminum alloys can improve strength and hardness compared to pure aluminum. In addition to solid solution strengthening, some aluminum alloys can also be strengthened by heat treatment, so that the tensile strength of some aluminum alloys can be more than 600 Mpa. The thermal conductivity and electrical conductivity are 3 times that of steel. The aluminum alloys used for automobile body panels mainly include 2000 series, 5000 series and 6000 series alloys. From the perspective of materials required for automobile bodies and their processing characteristics, 2000 series and 5000 series are mainly used as inner panels of automobile panels, while 6000 series is mainly used for the outer panels of automobile panels. 5000 series and 6000 series

5. automotive aluminum sheets are often used to replace traditional steel panels like aluminum alloy 5754. The performance requirements for aluminum alloy sheets for car manufacturing are: in addition to mechanical properties and corrosion resistance that meet standards and specifications, they should also have the following properties: 1. Good formability, low yield-to-strength ratio and high forming limit. 2. Smooth surface. 3. Good welding performance. In order to meet the process performance requirements of welding processing of automobile parts, aluminum alloy plates need to have good welding performance. 4. Good baking hardening performance. 5. High dent resistance. 6. Excellent surface treatment and coating performance. 7. Certain anti-aging stability performance. Comparison of 6xxx series and 5xxxx series aluminum alloys for car making As mentioned before, aluminum alloy automobile body panels mainly include 6xxx series and 5xxx series alloys. Typical grades include AA6014, 6016, 6111, 6022, 6181, 5052, 5182, 5754 and other aluminum alloys; the thickness specifications of aluminum plates for cars are generally 0.7-2.0mm. 6xxx Al-Mg-Si(-Cu) alloy Al-Mg-Si-(Cu) alloys are widely used in automotive panels and other fields due to their high strength and good formability. The requirements for this type of alloy are to have good plasticity before baking and high precipitation hardening ability during the baking process, that is, to have a high paint hardening response. Al-Mg-Si-(Cu) alloy is an aluminum alloy that can be strengthened by heat treatment and has good formability, strong corrosion resistance, high strength and good high temperature resistance.

6. 5xxx aluminum alloys It is an aluminum alloy that cannot be strengthened by heat treatment. It has the characteristics of medium strength, good corrosion resistance, good processing performance and good welding performance. It is easy to produce delayed yielding and Leders lines and when the grain size is >100μm, the plate is prone to the "orange peel effect", so it is usually used to make inner panels of the car body. 5754 5454 Aluminum Sheet for Making Fuel Tanker 5754 aluminum plate is a typical Al-Mg alloy. It has the characteristics of medium strength, good corrosion resistance and weldability, and easy processing and forming. 5754 aluminum alloy plates in different heat treatment states are widely used in welded structural parts, large roof panels, automobile manufacturing, rail transit, shipbuilding manufacturing and other fields.Among them, 5754 h22 and h32 are more often used. What are the aluminum 5754 h22 properties? 5754 h22 aluminum means that after the work hardening, its strength is 190-240 MPa, elongation is over 12, and its yield strength is over 80 MPa.

7. 5754 aluminum alloy contains low magnesium content, and its plates are mostly used in the annealed state. The cold working rate of the 5754H2n aluminum alloy before annealing is more than 75%. The annealing temperatures of the H22, H24, H26, and H28 states are 250, 230, 210, and 180 degrees Celsius respectively, and the holding time is 2 hours. 5454 aluminum alloy is also a kind of rust-proof aluminum sheets, which can adapt to harsh corrosive environments. Its strength is about 20% higher than that of 5052 aluminum plate, and its characteristics are similar to that of 5154 aluminum plate. However, its corrosion resistance in harsh environments is better than 5154. It is commonly used in fuel tankers, marine facility pipelines, automobile wheels,

8. etc. Whether from the perspective of economic benefits, social benefits, or safety and environment, the aluminum alloy load tankers made of 5454 alloy have incomparable advantages. Aluminum tank trucks are about 20% lighter than steel tank trucks of the same size, and their transportation capacity is increased by 30%. At the same time, because the 5454 aluminum alloy has high strength, good corrosion resistance and wear resistance, it ensures that the tank truck is more wear-resistant and durable, has a long life, is more economical and environmentally friendly, and achieves a lightweight vehicle body. Haomei Aluminum can offer 5754 and 5454 aluminum sheets with thickness ranging from 0.15-600mm, width ranging from 20-2650mm, and length ranging from 500-16000mm, to meet the diverse needs of different customers. When packaging 5754 and 5454 alloy, the aluminum plates should be sandwiched with paper or film to ensure that the surface of the aluminum material is intact and without scratches. When packing, wooden pallets are installed and reinforced with steel strips to avoid collisions during transportation and ensure that the geometric shape of the aluminum plates remains unchanged. Aluminum Sheet for Airplane Fuselage As a relatively mature lightweight and high-strength alloy, aluminum alloy is widely used in aerospace. The aircraft aluminum alloys are are generally used as structural materials and have higher specific strength and better processing properties than steel. The aerospace field mainly develops aluminum alloy sheets with high strength, high toughness and strong corrosion resistance to meet the harsh usage conditions of aerospace. Traditional aluminum alloys used for large aircraft structures are mainly high-strength 2××× series (2024, 2224, 2324, 2424, 2524, etc.) and ultra-high-strength 7××× series (7075, 7475, 7050, 7150, 7055 , 7085, etc.).

9. After the 1980s, although competition from new materials such as aluminum-lithium alloys, rapidly solidifying aluminum alloys, and composite materials emerged, the traditional 2××× series and 7××× series aluminum alloys still show strong vitality. 7075 aluminum alloy is a high-strength, heat-treatable deformed alloy developed by Alcoa in 1943. The alloy contains zinc, magnesium, chromium and copper as hardeners, along with smaller amounts of iron, silicon, manganese and titanium. After heat treatment, Al-7075 is much stronger than carbon steel. Its common tempers are 7075-T6, T651, T7351, T73, T76, T7651, O, W, W51, etc. 7075 t651 has an ultimate tensile strength of 570 MPa (83,000 psi) and a yield strength of 500 MPa (73,000 psi). It has an elongation to failure of 3-9%. These properties can vary depending on the form of material used. 7075 thick aluminum sheet may exhibit lower strength and elongation than the numbers listed above. How about aa2024 properties? 2024 aluminum alloy is an aluminum alloy with copper as the main alloy element. It is used in applications requiring a high strength-to-weight ratio as well as good fatigue resistance. It can only be welded by friction welding and has moderate machinability. Due to poor corrosion resistance, they are often protected by aluminum cladding, although this may reduce fatigue strength. 2024-T3 is one of the most widely used alloys in airframe structures. It has moderate yield strength, good resistance to fatigue crack growth and good fracture toughness. 2024 aluminum alloy remains an important aircraft structural material due to its

10. excellent damage tolerance and high resistance to fatigue crack growth under T3 aging conditions.