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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of hydrostatic pressure on martensitic transformation in a ferromagnetic shape memory alloy Ni_2MnGa
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Effect of hydrostatic pressure on martensitic transformation in a ferromagnetic shape memory alloy Ni_2MnGa

机译：静水压力对Ni_2MnGa铁磁形状记忆合金马氏体相变的影响

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摘要

Ni_2MnGa transforms in the cooling process from the parent (P-) phase to the intermediate (I-) phase and then to the martensite (M-) phase. Under a uniaxial stress, a new phase (X-phase) appears, and the P -> I transformation distinctively separates to the P -> X, and the X -> I transformations. In the present study, we have studied the effect of hydrostatic pressure on these transformation temperatures. As a result, we found that the distinct separation described above does not occur under a hydrostatic pressure of up to 0.9 GPa. The P -> X and the I -> M transformation temperatures increase with increasing hydrostatic pressure, and the ratio is 13.1 K/GPa and 16.2K/GPa, respectively. The change in molar volume and/or thermal expansion coefficient associated with the transformation is estimated from these values.
机译：Ni_2MnGa在冷却过程中从母体（P-）相转变为中间（I-）相，然后转变为马氏体（M-）相。在单轴应力下，出现一个新的相（X相），并且P-> I转换明显地分离为P-> X和X-> I转换。在本研究中，我们研究了静水压力对这些转变温度的影响。结果，我们发现在高达0.9 GPa的静水压力下不会发生上述明显的分离。 P-> X和I-> M的转变温度随着静水压力的增加而增加，其比率分别为13.1 K / GPa和16.2K / GPa。由这些值估计与转变有关的摩尔体积和/或热膨胀系数的变化。

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