奥氏体变形对形状记忆合金Fe-28Mn-6 Si-5Cr亚结构和记忆行为的影响  

NFLUENCE OF AUSFORMING ON SUBSTRUCTURES AND SHAPE MEMORY BEHAVIOR IN Fe-28Mn-6Si-5Cr ALLOY

作　　者：邢晓东[1] 王德法[1] 陈金铭[1] 刘文西[1] 

机构地区：[1]天津大学材料学院,天津300072

出　　处：《热固性树脂》1999年第4期98-101,共4页Thermosetting Resin

摘　　要：本文研究了奥氏体变形（高于Ｍｄ温度）对Ｆｅ－２８Ｍｎ－６Ｓｉ－５Ｃｒ（％）合金形状记忆效应和亚结构的影响，结合热机械训练结果，揭示了影响合金形状记忆效应的主要因素。实验结果表明，所研究的合金在７００℃下进行９％的拉伸变形后，合金会产生均匀分布在奥氏体中的方向一致的层错和位错等亚结构，从而改善合金的形状记忆效应。奥氏体变形和热机械训练方法提高形状记忆效应的本质是由于分别通过动态回复和静态回复改善奥氏体母相的亚结构，与奥氏体母相强度的变化没有必然的联系。The influence of ausforming (deformation of austenite at temperatures above Md) on shape memory effect (SME) and the substructures in Fe-28Mn-6Si-SCr (%) alloy were studied, intending to reveal the shape memory factor in terms of microstructural characteristics in comparison with the case of thermo-mechanical training. It was found that the SME in the studied alloy could be effectively improved by ausforming at 700℃ for 9%tensile strain, in the process of which the oriented stacking faults and dislocations were evolved and regularly distributed in austenite. The improvement of SME by ausforming, as well as thermo- mechanical training, was attributed to the restored subsructures in austenite; while there was no closely correspondent relation between SME and the strength of austenite matrix.

关 键 词：奥氏体变形 形状记忆合金 亚结构 强度 铁硅锰系 

分 类 号：TG139.6[一般工业技术—材料科学与工程]