Continuous AFM observation of martensitic transformation and its reversion in training cycles of Fe-Mn-Si based shape memory alloys

被引：9

作者：

Liu, DZ ^{[1
]}

Kikuchi, T ^{[1
]}

Kajiwara, S ^{[1
]}

Shinya, N ^{[1
]}

机构：

[1] Natl Res Inst Met, Tsukuba, Ibaraki 3050047, Japan

来源：

SHAPE MEMORY MATERIALS | 2000年 / 327-3卷

关键词：

atomic force microscopy; martensitic transformation; thermomechanical treatment; Fe-Mn-Si based shape memory alloy;

D O I：

10.4028/www.scientific.net/MSF.327-328.215

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of thermomechanical treatment (so-called "training") cycles on stress-induced martensitic transformation and its reversion has been studied by atomic force microscopy (AFM) to make clear the origin of improvement of shape memory effect (SME) due to training in Fe-Mn-Si based shape memory alloys (SMAs). It was found that training cycles make martensite plates tend to grow on the primary shear system, i.e., on the most favorable shear system for the fee to hcp martensitic transformation. In addition, training cycles lead to a more uniform distribution of thin martensite plates in a grain. Martensitic plates with the above characteristics are easier to be reverted back to parent phase when heated, and then nearly perfect SME is obtained. AFM observation shows that the key factor to realize perfect SME in Fe-Mn-Si based SMAs is to produce the uniform distribution of thin martensite plates on the primary shear system when deformed by external stress.

引用

页码：215 / 218

页数：4

共 10 条

[1] Microstructural analysis of the stress-induced ε martensite in a Fe-Mn-Si-Cr-Ni shape memory alloy Part II:: Transformation reversibility [J].