Twin microstructure dependent mechanical response in Ni-Mn-Ga single crystals

被引：97
|
作者：
Straka, Ladislav [1 ,2 ]
Lanska, Natalyia [1 ]
Ullakko, Kari [1 ]
Sozinov, Alexei [1 ]
机构：
[1] AdaptaMat Ltd, FIN-00390 Helsinki, Finland
[2] Aalto Univ, Lab Engn Mat, FIN-00076 Aalto, Finland
来源：
APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 13期
关键词：
bending; gallium alloys; manganese alloys; martensitic structure; nickel alloys; twin boundaries; twinning; SHAPE-MEMORY MATERIALS; FIELD-INDUCED STRAINS; NI2MNGA; MOTION;
D O I：
10.1063/1.3373608
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Ni-Mn-Ga single crystals with a twinning stress of about 0.1 MPa were studied. They showed a tendency to stay in a single variant state and to retain only one or very few twin boundaries during martensite reorientation induced by an external stress or magnetic field. This makes the crystals problematic for application in a magnetic actuator. To solve the issue, we introduced many parallel twin boundaries into the crystals by bending. However, this twin microstructure was not stable under cycling load. Additionally, it exhibited a twinning stress of 0.8 MPa-about ten times higher than a crystal with a single boundary.
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页数：3
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