铁在铝铁合金加工软化中的作用

Effect of lron on the Work-softening of Al-Fe Alloy

铝及铝铁合金加工软化行为表明，质量分数为０．９９９６的铝没有加工软化现象．而在其中加入铁配成Ａｌ－Ｆｅ合金（其中Ｆｅ的质量分数为０．０２），当轧制率达９０％以上时出现加工软化现象．研究认为，Ａｌ中Ｆｅ的质量分数接近Ａｌ－Ｆｅ相图中共晶成分时，形成ＦｅＡｌ３粒子，起到净化Ａｌ基体作用，净化后的Ａｌ基体层错能提高，促使加工软化现象出现．

Research on work-softening behaviour of aluminum and its alloy with iron shows that the phenomenon of work-softening doesn't occur in the 99.96% Al, however it happens in the alloy of 99.96% Al added with 20% Fe when the rolling rate is more than 90%. The mian reason is that aluminum with iron's content approacing the eutecte point of Al-Fe diagram forms the second phase FeAl 3 with the result of purifying the Al-matrix. At the same time, the stacking fault energy will be increased and the work softening will also be promoted.