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Hamilton和周善佑都指出:由于高强铝合金7075(成分与LC_4铝合金相似)中Fe、Si杂质的含量高于7475铝合金,因而其超塑性低于7475铝合金。在文献[1]中报道的7475铝合金的最大延伸率为1200％,而在文献[3]中报道的LC_4铝合金最大延伸率只有500％。本文的研究工作表明:通过改变高强铝合金的形变热处理工艺参数,并增加人工时效,可以大大提高LC_4铝合金的超塑性。
Both Hamilton and Zhou Shanyou pointed out that because the content of Fe and Si impurities in high-strength aluminum alloy 7075 (similar in composition to LC4 aluminum alloy) is higher than that of 7475 aluminum alloy, its superplasticity is lower than that of 7475 aluminum alloy. The maximum elongation of 7475 aluminum alloy reported in [1] is 1200%, whereas the maximum elongation of LC_4 aluminum alloy reported in [3] is only 500%. The research work in this paper shows that the superplasticity of LC_4 aluminum alloy can be greatly improved by changing the parameters of the heat treatment for the deformation treatment of high strength aluminum alloy and increasing the artificial aging.