Magnetic-field-induced shape recovery by reverse phase transformation
Magnetic-field-induced shape recovery by reverse phase transformation
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DOI：
10.1038/nature04493
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发表时间：
2006-02-23
期刊：
影响因子：
64.8
通讯作者：
Ishida, K
中科院分区：
文献类型：
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作者：
Kainuma, R;Imano, Y;Ishida, K
在具有体心立方有序结构的Heusler合金中观察到了大的磁场诱导应变（1），并通过外部磁场引起的马氏体结构变体的重排来解释（1 - 3）。这些材料作为潜在的磁致动器材料引起了相当大的关注。在这里，我们报告的压缩变形NiCoMnIn合金的磁场诱导形状恢复。在施加70 kOe的磁场时，在材料中产生超过100 MPa的应力;这样的应力水平比在先前的铁磁形状记忆合金（4）中产生的应力水平大大约50倍。我们观察到3%的变形和几乎完全恢复合金的原始形状。我们把这种变形行为的逆变换从反铁磁（或顺磁）马氏体铁磁母相在298 K的Ni45Co5Mn36.7In13.3单晶。
Large magnetic-field-induced strains(1) have been observed in Heusler alloys with a body-centred cubic ordered structure and have been explained by the rearrangement of martensite structural variants due to an external magnetic field(1-3). These materials have attracted considerable attention as potential magnetic actuator materials. Here we report the magnetic-field-induced shape recovery of a compressively deformed NiCoMnIn alloy. Stresses of over 100 MPa are generated in the material on the application of a magnetic field of 70 kOe; such stress levels are approximately 50 times larger than that generated in a previous ferromagnetic shape-memory alloy(4). We observed 3 per cent deformation and almost full recovery of the original shape of the alloy. We attribute this deformation behaviour to a reverse transformation from the antiferromagnetic (or paramagnetic) martensitic to the ferromagnetic parent phase at 298 K in the Ni45Co5Mn36.7In13.3 single crystal.