材料科学
奥氏体
形状记忆合金
晶体孪晶
马氏体
无扩散变换
结晶学
冶金
合金
贝氏体
微观结构
化学
作者
Xiaoliang Zhang,Zongbin Li,Bo Yang,Haile Yan,Yudong Zhang,Claude Esling,Xiang Zhao,Liang Zuo
出处
期刊:Acta Materialia
[Elsevier]
日期:2023-01-01
卷期号:243: 118507-118507
被引量:11
标识
DOI:10.1016/j.actamat.2022.118507
摘要
Shape memory alloys exploit the crystallographically reversible martensitic transformation to achieve the significant shape memory effect. However, the crystallography of reverse transformation from deformed martensite to austenite that specifies the strain recovery remains less understood. In this work, based on the detailed microstructural and crystallographic examinations on the deformed seven-layered modulated (7M) martensite in a Ni50Mn30Ga20 alloy through uniaxial tension, it is revealed that the reverse transformation from deformed martensite to austenite may not conform to the transformation crystallography of self-accommodated martensite, but involve more crystallographic routes and higher lattice discontinuity to resume the crystallographic orientation of austenite, owing to the activation of new twinning systems in the deformed martensite. Comprehensive knowledge on the reverse transformation of deformed martensite is of practical importance for understanding the intrinsic characteristics of shape memory behavior and theoretical interest for insights into the crystallographic reversibility of martensitic transformation.
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