【摘要】 采用X射线衍射法对Fe 17Mn 5Si 10Cr 5Ni和Fe 17Mn 5Si 2Cr 2Ni 1V合金的应力诱发马氏体相变进行了定量的分析。研究结果表明 ,Fe 17Mn 5Si 10Cr 4Ni合金试样在室温下拉伸 ,当变形量约为6 %时 ,应力诱发ε马氏体的体积分数达最大值约 6 4 % ;在预变形量超过 5 %时 ,α′马氏体即开始出现且增加迅速 ;揭示在大变形下 ,Fe Mn Si合金中发生了应力诱发γ→ε→α′马氏体相变。Fe 17Mn 5Si 2Cr 2Ni 1V合金试样在室温拉伸时应力诱发ε马氏体量较Fe 17Mn 5Si 10Cr 4Ni合金更多 ,即使在预变形量超过 10 %时 ,也不出现α′马氏体。预变形温度降低 ,可促进应力诱发马氏体相变。更多还原

【Abstract】 The stress-induced martensitic transformation in Fe-17Mn-5Si-10Cr-4Ni and Fe-17Mn-5Si-2Cr-2Ni-1V shape memory alloys have been quantitatively analyzed by means of XRD analysis. It is found that in Fe-17Mn-10Cr-5Si-4Ni alloy, the volume fraction of stress induced ε martensite reaches its maximum value of about 64% under a tensile deformation of about 6% at room temperature. As pre-strain exceeds 5%,α′ martensite appears and grows quickly in the alloy. The results prove that the γ→ε→α′ martensitic transformation occurs in Fe-Mn-Si alloy under large deformation. The amount of stress-induced ε martensite in the Fe-17Mn-5Si-2Cr-2Ni-1V alloy deformed at room temperature is more than that in the Fe-17Mn-5Si-10Cr-4Ni alloy and no α′ martensite is observed even under a deformation more than 10%. The stress-induced martensitic transformation in Fe-Mn-Si based shape memory alloy can be enhanced by decreasing the deformation temperature.更多还原