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本文采用电阻分析、Ｘ射线衍射和电子探针等方法，研究了热加工条件对Ｆｅ－Ｍｎ－Ｓｉ基合 金马氏体相变和形状记忆效应（ＳＭＥ）的影响。当合金在热拉并７５０℃退火后发现，正常退火条件 下的ｆcｃ ｈｃｐ马氏体相变受到抑制，材料明显脆化，ＳＭＥ完全丧失。研究表明，这一热加工脆性 是由于合金中非平衡相的沉淀所致。材料重新加热到９３０℃以上，随着相重新溶解过程的完 成，上述热加工脆性得到消除，马氏体相变和ＳＭＥ也得到恢复。
In this paper, the influence of hot working conditions on martensitic transformation and shape memory effect (SME) of Fe-Mn-Si based alloys was studied by means of resistance analysis, X-ray diffraction and electron probe. When the alloy was annealed at 750 ℃, it was found that the martensitic transformation of fcc hcp under normal annealing was inhibited, the material was obviously embrittled and the SME was completely lost. Studies have shown that this hot working brittleness is due to the precipitation of the non-equilibrium phase in the alloy. The material is reheated to above 930 ° C. With the completion of the phase redissolution process, the thermal processing brittleness is eliminated and the martensitic transformation and SME are also restored.