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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Phase transformations in Ni-Ga-Fe ferromagnetic shape memory alloys
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Phase transformations in Ni-Ga-Fe ferromagnetic shape memory alloys

机译：Ni-Ga-Fe铁磁形状记忆合金的相变

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摘要

Phase equilibria between the β (B2 or L2_1) and γ (A1) phases in the Ni-Ga-Fe system at 900-1200℃ were determined by energy dispersion X-ray spectroscopy (EDX). The martensitic and magnetic transformation temperatures in β single- and β + γ two-phase Ni-Ga-Fe ferromagnetic shape memory alloys (FSMAs) were also determined by differential scanning calorimetry (DSC) and by vibrating sample magnetometer (VSM), respectively. It was found that the martensitic and magnetic transformation temperatures of the β single-phase alloy increase with decreasing annealing temperature in the region above 600℃. While the martensitic transformation temperatures decrease with decreasing annealing temperature in the region below 600℃, the Curie temperature increases and becomes saturated at about 400℃. Moreover, martensite phases with a 10M or 14M structure were observed by transmission electron microscopy (TEM). These characteristic features are discussed in terms of the thermal stability of the β phase and the order-disorder transition from the B2 structure to the L2_1 structure.
机译：通过能量色散X射线能谱（EDX）测定了Ni-Ga-Fe系统中900-1200℃的β（B2或L2_1）和γ（A1）相之间的相平衡。还分别通过差示扫描量热法（DSC）和振动样品磁强计（VSM）确定了β单相和β+γ两相Ni-Ga-Fe铁磁形状记忆合金（FSMA）中的马氏体和磁转变温度。结果表明，在600℃以上，β单相合金的马氏体和磁转变温度随退火温度的降低而升高。 600℃以下区域，马氏体相变温度随着退火温度的降低而降低，而居里温度则升高，并在400℃左右达到饱和。此外，通过透射电子显微镜（TEM）观察到具有10M或14M结构的马氏体相。根据β相的热稳定性和从B2结构到L2_1结构的有序无序过渡来讨论这些特征。

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