Stress-free two-way thermoelastic shape memory and field-enhanced strain in Ni52Mn24Ga24 single crystals

Stress-free two-way thermoelastic shape memory and field-enhanced strain in Ni52Mn24Ga24 single crystals
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Ni52Mn24Ga24 单晶的无应力双向热弹性形状记忆和场增强应变

DOI:
10.1063/1.1325388
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发表时间:
2000-11
期刊:
Appl.Phys.Lett.
影响因子:
--
通讯作者:
W.S.Zhan
W.S.Zhan
中科院分区:
其他
文献类型:
--
作者:
W.H.Wang,G.H.Wu,J.L.Chen,C.H.Yu,S.X.Gao,;W.S.Zhan

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在单晶Ni_(52)Mn_(24)Ga_(24)中发现了无应力双向热弹性形状记忆效应,其应变率为1.2%,温度滞后为6 K。在沿着测量方向施加1.2 T的偏置场时,变形可增强3倍以上,收缩率可达4.0%,或在垂直于测量方向施加1.2 T的偏置场时,变形可变为1.5%的膨胀。对于实现大的变形,磁场表现出更明显的贡献比外部应力对这种材料。这些特征可以归因于低水平的内应力和马氏体变体的择优取向。
Stress-free and two-way thermoelastic shape memory, with 1.2% strain and 6 K temperature hysteresis, has been found in single crystalline Ni52Mn24Ga24. The deformation can be enhanced more than three times, up to 4.0% shrinkage with a bias field 1.2 T applied along the measurement direction, or changed to 1.5% expansion by the 1.2 T applied perpendicular to the measurement direction. For achieving a large deformation, the magnetic field exhibits a more evident contribution than an external stress on this material. These characteristics can be attributed to the low level of internal stress and the preferential orientation of the martensitic variants.
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影响因子: 3.2
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