Magnetocrystalline anisotropy constant and twinning stress in martensite phase of Ni-Mn-Ga
Magnetocrystalline anisotropy constant and twinning stress in martensite phase of Ni-Mn-Ga
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DOI：
10.1016/j.msea.2006.02.121
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发表时间：
2006-11
期刊：
影响因子：
6.4
通讯作者：
N. Okamoto;T. Fukuda;T. Kakeshita;T. Takeuchi
中科院分区：
文献类型：
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作者：
N. Okamoto;T. Fukuda;T. Kakeshita;T. Takeuchi
我们研究了磁场驱动下Ni2MnGa中10M马氏体和Ni2.14Mn0.92Ga0.94中2M马氏体在低于每个相变温度的宽温度范围内的马氏体变体重排。获得以下结果：（i）10M马氏体的孪晶面在磁场作用下发生移动，而2M马氏体的孪晶面在任何温度下都不发生移动。（ii）为了解释这种差异，我们利用本研究中测得的磁晶各向异性常数（Ku）计算了作用在孪晶面上的最大磁剪应力（τmagm），和压缩试验得到的10M和2M马氏体的孪晶剪应力τreq之间的关系，确定了10M马氏体是否满足τmagm>τ req的关系，2M马氏体是否满足τmagm<τ req的关系。结果，对于10M和2M马氏体，在任何温度下都满足上述条件。
We have examined rearrangement of martensite variants driven by magnetic field for 10M martensite in Ni2MnGa and 2M martensite in Ni2.14Mn0.92Ga0.94in a wide temperature range below each transformation temperature. The following results are obtained: (i) the twinning plane of the 10M martensite moves by the application of magnetic field, but that of 2M martensite does not at any temperature, (ii) in order to explain such difference, we have evaluated the maximum of the magnetic shear stress acting across the twinning plane (τmagm), which is calculated by using the magnetocrystalline anisotropy constant (Ku) measured in this study, and the twinning shear stress (τreq) obtained by compressive test in this study for the 10M and 2M martensites, and have confirmed whether or not the relation of τmagm>τreqis satisfied for 10M martensite and that of τmagm<τreqis satisfied for 2M martensite. As a result, the above condition is satisfied at any temperatures for 10M and 2M martensites.