形状记忆Fe－Mn－Si合金中马氏体相变和扭转形变的恢复

The Martensitic Transformation and Recovery of Torsionally Deformed Samples in the Shape Memory Alloy of Fe-Mn-Si

研究了Ｆｅ－２９．４４Ｍｎ－６．２０Ｓｉ合金中的γ ε相变和顺磁性反铁磁性转变（以下简称磁转变）。用电阻测量跟踪了此过程。用ｘ射线衍射法（ＸＲＤ）作了相分析。硅急剧增加六方相的电阻率，ε→γ相变表现为电阻降低，γ→ε转变表现为电阻升高。ＸＲＤ表明，淬火后样品中除γ相外有少量六方ε相。扭转形变恢复率与形变量和形变前有无热诱发马氏体存在有很大关系。

Theγεtransformation andparamagnetism antiferromagnetism transformation(magnetic transformation)in Fe-29. 44Mn-6. 20Sialloy were investigated with electrical resistancemeasurement and X-ray diffraction method.Silicanincreases resistivity of hexagonal phase. Theresistance decreases when ε→γtransformation occursand increases when γ→ε transformation occurs,Therecovery of torsional deformation has an intimaterelation with the existed thermally inducedmartensite and degree of torsional deformation.