Low-temperature martensite relaxation in Co-Ni-Ga shape memory alloy monocrystal revealed using in situ cooling, transmission electron microscopy and low rate calorimetry.,Acta Crystallographica Section B

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Low-temperature martensite relaxation in Co-Ni-Ga shape memory alloy monocrystal revealed using in situ cooling, transmission electron microscopy and low rate calorimetry.
Acta Crystallographica Section B ( IF 1.3 ) Pub Date : 2020-07-13 , DOI: 10.1107/s2052520620006794
Andrzej Żak ₁ , Anna Dańczak ₂ , Włodzimierz Dudziński ₃

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This work presents the results of research on a Co₄₉Ni₂₁Ga₃₀ magnetic shape memory single crystal. Based on a literature review, it was identified that analyses of phase transformations have been limited to specific heating and cooling rates, which could lead to an incomplete description of the resulting phenomena. Differential scanning calorimetry (DSC) performed with different heating/cooling rates enabled the precise determination of enthalpy values, which deviate from literature values. Weak and previously unnoticed thermal phenomena at temperatures below 190 K were also observed. Their presence was confirmed by low‐temperature in situ transmission electron microscopy (TEM). Through DSC measurements and TEM observations, a model of the discovered phenomenon was proposed, which may have an impact on a better understanding of the physics of magnetic shape memory materials.

中文翻译：

Co-Ni-Ga形状记忆合金单晶中的低温马氏体弛豫通过原位冷却，透射电子显微镜和低速量热法揭示。

这项工作提出了对Co ₄₉ Ni ₂₁ Ga ₃₀磁性形状记忆单晶的研究结果。根据文献综述，可以确定，对相变的分析仅限于特定的加热和冷却速率，这可能导致对所得现象的不完整描述。用不同的加热/冷却速率进行的差示扫描量热法（DSC）可以精确确定焓值，而这与文献值有所不同。在低于190 K的温度下，也观察到了较弱且以前未注意到的热现象。通过低温原位证实了它们的存在透射电子显微镜（TEM）。通过DSC测量和TEM观察，提出了一种发现的现象的模型，这可能对更好地理解磁性形状记忆材料的物理学有影响。

更新日期：2020-07-13

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