通过不同变形量的弯曲试验 ,结合X射线衍射对相结构的分析 ,研究了热机械循环对Fe- 17Mn - 5Si- 9Cr- 4Ni记忆合金记忆效应的影响 .结果表明 :热机械循环能显著提高合金的记忆效应 ;当变形量为 4%时 ,经五次循环后 ,相对回复率fsme为 80 .8% ,绝对应变回复率εT 为 3.12 % ;当变形量为 6 %时 ,fsme为 79.3% ,εT 为 4.4% ;随着变形量的增加 ,fsme逐渐减少 ,但绝对回复率相对提高 ;并且亚晶界及晶体内的胞状亚结构逐渐减少 ,晶粒度逐渐粗大 The effects of thermo-mechanical cycles on the memory effect of Fe-17Mn-5Si- 9Cr-4Ni memory alloy were studied by different bending deformation tests and X-ray diffraction analysis. The results show that the thermo- The fsme was 80.8% and the absolute strain recovery εT was 3.12% when the amount of deformation was 4%. The fsme was 79.3% when the amount of deformation was 6% εT was 4.4%. With the increase of deformation, fsme decreased gradually, but the absolute recovery rate increased relatively. And the subgrains and the intracellular intracellular sub-structure gradually decreased and the grain size gradually became coarse