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70年代末以来,人们对结构材料提出了一系列新的要求,希望它们具有更高的强度、更轻的重量和/或更好的耐高温性能,特别是对航天材料.这些要求导致了许多新型先进铝合金的诞生.那些合金大体上可分为三类:第一类是强度高、耐蚀性好的粉末冶金合金,如雾化粉末合金7091和CW67,其性能大大超过了铸锭冶金7000系合金的.第二类合金为低密度、高刚性Al-Li基合金,对于铸锭冶金其含锂量不可超过
Since the late 1970s, a series of new requirements have been put on structural materials in the hope that they will have higher strength, lighter weight and / or better high temperature resistance, especially for aerospace materials. These requirements have led to many The birth of a new advanced aluminum alloy. Those alloys can be roughly divided into three categories: The first category is high strength, good corrosion resistance of powder metallurgy alloys such as atomized powder alloy 7091 and CW67, its performance greatly exceeded the ingot metallurgy 7000 series alloy.The second type of alloy is a low density, high rigidity Al-Li-based alloy, for the ingot metallurgy its lithium content can not exceed