平衡相对8090Al－Li合金力学性能的影响

EFFECTS OF EQUILIBRIUM PHASES ON MECHANICAL PROPERTIES OF 8090 Al-Li ALLOY

研究了一种８０９０Ａｌ－Ｌｉ合金中平衡相Ｔ２（Ａｌ６ＣｕＬｉ３）和δ（ＡｌＬｉ）数量变化对合金室温力学性能的影响。结果表明，合金经过双级时效（２１０－３００℃，４ｈ＋回复处理＋１６０℃，１００ｈ）后，Ｔ２相的大量析出会使合金的强度有所降低，塑性有一定程度升高，而δ相的大量析出迅速降低合金的强度，大幅度提高塑性。

Effects of contents of equilibrium phases T2 and δ in 8090 Al-Li alloy with composition (mass fraction, %) of Al-2.45Li-1.21Cu-1.20Mg-0.15Zr on its mechanical properties had been studied. The results show that, after double-aging treatments (210-300℃, 4h+retrogression+160℃, 100h), a large amount of precipitation of T2 may reduce the strength and improve the enlongation of the alloy to a certain extent, but a large amount of precipitation of δ may reduce the strength and improve the elongation of the alloy greatly.