At present, with the rapid development of aerospace technology, aluminum alloy and its composite materials are widely used in aerospace due to their high specific strength, excellent corrosion resistance and excellent formability.
7075 aviation aluminum sheet was the first aluminum alloy material used in aircraft in the late 1940s. After that, by adding other types of alloying elements, changing the content of its alloying elements and changing its heat treatment process, many aerospace materials with excellent properties were obtained.
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As a stressed component of contemporary aircraft, 7075 anti-rust aluminum plate has the advantages of high specific strength, large yield ratio, and strong plastic toughness. It is the pillar structural profile for many industries in the future. But at present, there are many shortcomings in the industrialization of 7075 series ultra-high-strength aluminum alloys. Moreover, the disadvantages of such aluminum alloys, such as poor corrosion resistance and low fatigue strength, limit their wide application.
In the future, ordinary high-strength aluminum alloys should be improved and developed from the following aspects:
(1) Develop a new type of ultra-high-strength aluminum alloy with higher strength by applying rapid solidification and external field (electromagnetic field, etc.) during casting to strengthen the matrix and solid-solve more alloy elements;
(2) Strengthen the research of furnace smelting technology, deepen the development of purification technology, reduce the internal impurity content of the molten pool, and it is impossible to allow macroscopic defects to appear, reduce crack propagation defects, and improve its uniformity;
(3) Develop aluminum-based composite materials to obtain composite coatings with excellent corrosion resistance.