采用力学性能试验机、透射电子显微镜(TEM)、应力时效炉等手段研究时效拉应力对2E12铝合金的力学性能和微观组织的影响,并分析应力对2E12铝合金的作用机理.结果表明:外加应力能提高2E12铝合金的强度,增大合金各向异性的差异；外加应力能促进S相的析出,并产生明显的应力位向效应；应力时效能使2E12铝合金的无沉淀析出带变窄,阻止晶界沉淀相的连续析出；应力时效为控制高强铝合金的各向异性提供了一种新方法.
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