What is the difference between aluminum alloy and aluminum block?

by:Caiyi     2019-12-27
Zinc Alloy is an alloy based on zinc and added with other elements. Frequently added alloying elements include aluminum, copper, magnesium, cadmium, lead, titanium and other low-temperature zinc alloys. Zinc Alloy has low melting point, good fluidity, easy fusion welding, brazing and plastic processing, corrosion resistance in the atmosphere, and easy recovery and remelting of residual waste; However, the creep strength is low and the size change caused by natural aging is easy to occur. Preparation by melting, die casting or pressure processing. According to the manufacturing process, it can be divided into cast zinc alloy and deformed zinc alloy. Aluminum Alloy is a general term for aluminum-based alloys. The main alloying elements are copper, silicon, magnesium, zinc and manganese, while the secondary alloying elements are nickel, iron, titanium, chromium and lithium. Aluminum Alloy is the most widely used non-ferrous metal structural material in industry. It has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industries. With the rapid development of science and technology and industrial economy in recent years, the demand for aluminum alloy welded structural parts is increasing day by day, which makes the research on the weldability of aluminum alloy further. The wide application of aluminum alloy has promoted the development of aluminum alloy welding technology, and the development of welding technology has expanded the application field of aluminum alloy. Therefore, the welding technology of aluminum alloy is becoming one of the research hotspots. The density of pure aluminum is small (ρ = 2. 7g/cm3), About 1/3 of iron, low melting point (660 ° C) Aluminum is a face-centered cubic structure, so it has a high plasticity ( δ: 32 ~ 40%, Ψ: 70 ~ 90%) It is easy to process and can be made into various profiles and plates. Good corrosion resistance; However, the strength of pure aluminum is very low, and the σ B value in annealed state is about 8kgf/mm2, so it is not suitable for structural materials. Through long-term production practice and scientific experiments, people gradually strengthen aluminum by adding alloy elements and using heat treatment, which has resulted in a series of aluminum alloys. The alloy formed by adding certain elements can have higher strength while maintaining the advantages of light weight of pure aluminum, and the σ B value can reach 24 ~ 60kgf/mm2. This makes its 'specific strength '(The ratio of strength to specific gravity σb/ρ) It is better than many alloy steels and becomes an ideal structural material. It is widely used in machinery manufacturing, transportation machinery, power machinery and aviation industry. The fuselage, skin and compressor of aircraft are often made of aluminum alloy, to reduce self-weight. Using aluminum alloy to replace the welding of steel plate material can reduce the structural weight by more than 50%. Aluminum Alloy has low density but high strength, is close to or exceeds high-quality steel, has good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance, and is widely used in industry, the usage is second only to steel. Aluminum Alloy is divided into two categories: cast aluminum alloy, used in as-cast State; Deformed aluminum alloy, can withstand pressure processing ,. Can be processed into various forms and specifications of aluminum alloy materials. Mainly used for manufacturing aviation equipment, building doors and windows, etc. Aluminum alloy can be divided into deformed aluminum alloy and cast aluminum alloy according to processing methods. Deformation aluminum alloy can be divided into non-heat treated reinforced aluminum alloy and heat treated reinforced aluminum alloy. Non-heat treatment strengthening type cannot improve mechanical properties through heat treatment, but can only be strengthened through cold working Deformation. It mainly includes high purity aluminum, industrial high purity aluminum, industrial pure aluminum and antirust aluminum. Heat-treatable reinforced aluminum alloy can improve its mechanical properties by heat treatment methods such as quenching and aging. It can be divided into hard aluminum, forged aluminum, ultra-hard aluminum and special aluminum alloy. Some aluminum alloys can be heat treated to obtain good mechanical properties, physical properties and corrosion resistance. Cast aluminum alloys can be divided into aluminum-silicon alloy, aluminum-copper alloy, aluminum-magnesium alloy, aluminum-zinc alloy and aluminum rare earth alloy according to their chemical composition, of which aluminum-silicon alloy has simple aluminum-silicon alloy ( Can not be heat treated, low mechanical properties, good casting performance), Special aluminum-silicon alloy ( Heat treatment strengthening, high mechanical properties, good casting performance).
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