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一、绪言自从发现了时效硬化现象以来,铝因为具有重量轻,强度好等特性,所以在近数十年内做为重要工业材料已经形成基础,成为近代物质文明的宝贵材料.工业材料的铝合金,其延伸率之大,是其他合金所不能相比的.1940年前后,把铝合金确定为飞机使用的固定材料后,相继,又大量地应用于机械、电气、交通工具及建筑上.当前,民用上,已被广泛地应用于各家各户.
I. INTRODUCTION Since the discovery of the phenomenon of age hardening, aluminum has become a valuable material for modern material civilization as an important industrial material in recent decades due to its characteristics of light weight and good strength. Aluminum alloy for industrial materials , Its elongation is large compared to other alloys can not be compared before and after 1940, the aluminum alloy to determine the fixed material used in aircraft, one after another, but also extensively used in machinery, electrical, transport and construction. , Civilian, has been widely used in various households.