Grain size effect on martensitic transformation, mechanical and magnetic properties of Ni–Mn–Ga alloy fabricated by spark plasma sintering
Grain size effect on martensitic transformation, mechanical and magnetic properties of Ni–Mn–Ga alloy fabricated by spark plasma sintering
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DOI：
10.1016/j.jallcom.2011.11.077
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发表时间：
2012-02
影响因子：
6.2
通讯作者：
X. Tian;J. Sui;Xuexi Zhang;Xiaohang Zheng;W. Cai
中科院分区：
文献类型：
--
作者：
X. Tian;J. Sui;Xuexi Zhang;Xiaohang Zheng;W. Cai
采用放电等离子烧结法制备了不同晶粒尺寸的烧结Ni-Mn-Ga合金。首次研究了晶粒尺寸对 Ni-Mn-Ga 合金马氏体转变、力学和磁性能的影响。结果表明，马氏体相变和相变滞后现象受晶粒尺寸的影响显着。尽管晶粒尺寸不同，所有烧结态 Ni-Mn-Ga 合金均表现出高饱和磁化强度。此外，还发现晶粒尺寸对机械性能起着重要作用。具有适当晶粒尺寸的烧结样品表现出迄今为止报道的最高断裂应变。
The sintered Ni–Mn–Ga alloys with various grain sizes have been fabricated by using the spark plasma sintering method. The effect of grain size on martensitic transformation, mechanical and magnetic properties of Ni–Mn–Ga alloys have been investigated for the first time. The results show that martensitic transformation and transformation hysteresis are significantly affected by the grain size. All as-sintered Ni–Mn–Ga alloys exhibit high saturation magnetization despite their different grain sizes. Moreover, it is found that the grain size plays important roles on mechanical properties. The sintered specimen with appropriate grain size exhibits the highest fracture strain reported so far.