摘要
通过高分辨透射电镜观察得知,Fe-25%Mn-4.5%Si-1%Cr-2%Ni形状记忆合金中母相γ的亚结构主要是平行分布的、不同程度重叠的层错。母相的这一亚结构特征决定随应力诱发相变进行的程度不同,可分别形成单片状和多层状两类不同形态的ε马氏体(εM),这由透射电镜观察得到了证实。这两类不同形态εM的逆相变特征亦不相同,单片状εM在逆相变时能保持较好的晶体学可逆性,有利于形状记忆效应,而多层状εM由于受到层间界面的制约,逆相变后残留下较多晶体缺陷,对形状恢复不利。
The sub-structure of γ parent phase in the Fe-25%Mn-4.5%Si-1%Cr-2%Ni shape memory alloy was observed by high resolution electron microscope(HREM),and it was found that there were a lot of parallel stacking faults,which overlap each other in different degrees.This character leads that two kinds of ε martensite(εM) of different configuration can form as the γ→ε transformation goes to different degree,that is,single-plate εM and multilayer ones.These two kinds of εM have been approved by transmission electron microscope(TEM).In addition,characteristics of γ→ε reverse transformation in the two kinds of εM are different.The single-plate εM can keep good crystallographic reversibility during reversion,which is beneficial to shape memory effect.The case for the multilayer εM is different.Since so much crystal defects were left during the reverse ε→γ transformation,crystallography of the multilayer εM is not well reversible,which is disadvantageous for shape recovery in the alloy.【
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2007年第5期667-670,共4页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(50401003)
天津市自然科学基金资助项目(033608811)
全国优秀博士学位论文作者专项基金资助项目(200335)
河南省国际合作资助项目(0546620015)
