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此系变形鋁合金已有很长的历史。日本早在1942年就在零字战斗机上使用了住友公司的超强杜拉鋁(ESD)(5.5％Zn-2.5％Mg-1.5％Cu-0.2％Mn-0.3％Cr)作結构材料。美国模仿这一牌号急忙制造了75S。这是目前已知的鋁合金中强度最高的热处理合金(抗張强度約57公斤/毫米~2),現正致力于研究改善其抗蝕性。据发明者叙述,从改善抗蝕性方面考虑,鋅含量限制在5.5％左右,但因强度不够而加入一定量的銅使合金补强,而为了防止晶間腐蝕加
This Department has a long history of aluminum deformation. As early as 1942, Japan used Sumitomo Super Duralumin (ESD) (5.5% Zn-2.5% Mg-1.5% Cu-0.2% Mn-0.3% Cr) as a structural material on a Zero Word fighter. The United States hastily manufactured the 75S imitating this grade. This is the highest-strength heat-treated alloy known in the art (tensile strength of about 57 kg / mm 2) and is currently being studied to improve its corrosion resistance. According to the inventor’s description, from the aspect of improving corrosion resistance, the content of zinc is limited to about 5.5%, but due to insufficient strength, a certain amount of copper is added to reinforce the alloy, and in order to prevent intergranular corrosion