Magnetic Field-Induced Reverse Martensitic Transformation and Thermal Transformation Arrest Phenomenon of Ni41Co9Mn39Sb11 Alloy
Magnetic Field-Induced Reverse Martensitic Transformation and Thermal Transformation Arrest Phenomenon of Ni41Co9Mn39Sb11 Alloy
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DOI：
10.3390/met4040609
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
R. Umetsu;Xiao Xu;W. Ito;T. Kihara;Kohki Takahashi;M. Tokunaga;R. Kainuma
中科院分区：
文献类型：
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作者：
R. Umetsu;Xiao Xu;W. Ito;T. Kihara;Kohki Takahashi;M. Tokunaga;R. Kainuma
为了研究Ni-Co-Mn-Sb合金的磁场诱导逆马氏体相变行为，进行了18 T静磁场和40 T脉冲磁场下的磁化实验。在Ni 41 Co 9 Mn 39 Sb 11合金的热磁化曲线中，平衡相变温度T0随外加磁场μ 0 H的增大而降低，其降低速率为dT 0/dμ 0 H = 4.6K/T。由Clausius-Clapeyron关系式估算的熵变值约为14.1J/（K·kg），与差示扫描量热法测量的结果吻合较好。在等温磁化曲线中，观察到了与磁场诱导马氏体相变相关的变磁行为。Ni-Co-Mn-Sb系马氏体相变的平衡磁场μ 0 H 0 =（μ 0 HAf + μ 0 HMs）/2在较低温度下趋于饱和，即证实了与Ni（Co）-Mn-Z（Z = In，Sn，Ga，Al）合金类似的相变停滞现象。基于位错引起的塑性变形模型，分析了磁场磁滞的温度依赖性μ 0 Hhys = μ 0 HAf − μ 0 HMs。实验结果很好地反映了外加磁场扫描速率的差异。
In order to investigate behavior of magnetic field-induced reverse martensitic transformation for Ni-Co-Mn-Sb, magnetization experiments up to a static magnetic field of 18 T and a pulsed magnetic field of 40 T were carried out. In the thermomagnetization curves for Ni41Co9Mn39Sb11 alloy, the equilibrium transformation temperature T0 was observed to decrease with increasing applied magnetic field, μ0H, at a rate of dT0/dμ0H = 4.6 K/T. The estimated value of entropy change evaluated from the Clausius-Clapeyron relation was about 14.1 J/(K·kg), which was in good agreement with the value obtained by differential scanning calorimetric measurements. For the isothermal magnetization curves, metamagnetic behavior associated with the magnetic field-induced martensitic transformation was observed. The equilibrium magnetic field, μ0H0 = (μ0HAf + μ0HMs)/2, of the martensitic transformation tended to be saturated at lower temperature; that is, transformation arrest phenomenon was confirmed for the Ni-Co-Mn-Sb system, analogous with the Ni(Co)-Mn-Z (Z = In, Sn, Ga, Al) alloys. Temperature dependence of the magnetic field hysteresis, μ0Hhys = μ0HAf − μ0HMs, was analyzed based on the model for the plastic deformation introduced by the dislocations. The behavior can be explained by the model and the difference of the sweeping rate of the applied magnetic field was well reflected by the experimental results.