High strength aluminum alloys are required in some industry like construction, equipment, automobile, boat-building and aircraft area. Strength is an important factor that must be considered in product design. When it is an aluminum alloy component as a component, an appropriate alloy should be selected according to the pressure it is subjected to. Pure aluminum 1000 series has the lowest strength, while 2000 series and 7000 series heat-treated alloys have the highest degree of hardness, and there is a certain lower phase relationship between hardness and strength.
High strength aluminum alloys refer to aluminum alloys whose tensile strength is greater than 480MPa, mainly based on Al-Cu-Mg and Al-Zn-Mg-Cu alloys, namely 2XXX (hard aluminum alloys) and 7XXX (superhard aluminum alloys) series alloys. The static strength of the former is slightly lower than that of the latter, but the operating temperature is higher than that of the latter. Due to the chemical composition of the aluminum alloys, the way of melting and solidification, the processing technology and the heat treatment system, the properties of the alloy vary greatly. The highest strength of 7090 aluminum alloy in North America is 855MPa, the strength of European aluminum alloy is 840MPa, the strength of Japanese aluminum alloy is 900MPa, and the strength of ultra-high-strength aluminum alloy reported in my country is 740MPa.
High strength aluminum alloys have the characteristics of low density, high strength, good processing performance and excellent welding performance. It is widely used in the aviation industry and civil industry and other fields, especially in the aviation industry, it occupies a very important position and is one of the main structural materials in the aviation industry. In recent decades, scholars at home and abroad have carried out a lot of research on the heat treatment process and properties of high-strength aluminum, and have made important progress, which has greatly promoted the wide application of such materials in the production of the aviation industry.