Atomic-size effect on the microstructural properties of Ni2FeGa

Atomic-size effect on the microstructural properties of Ni2FeGa
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原子尺寸对Ni2FeGa微观结构性能的影响

DOI:
10.1016/j.actamat.2010.10.057
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发表时间:
2011-02
期刊:
影响因子:
9.4
通讯作者:
吴光恒
吴光恒
中科院分区:
材料科学1区
文献类型:
--
作者:
Huai-Ruo Zhang;吴光恒

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用透射电子显微镜研究了铁磁形状记忆合金Ni{sub 2}FeGa快淬薄带的显微结构。建立了富Fe和富Ga两种微调制结构。富Fe微调制结构是由Fe原子部分取代L2{sub 1}结构中{l_brace}3 5 0{r_brace}面上的Ga原子而形成的。富Ga微调制结构涉及Ga原子部分取代{l_brace}3 + n,5 + n,0{r_brace}(n {>=} 0)面上的Fe原子。富Fe和富Ga的微调制结构起源于Fe和Ga组分的调幅分解,这与Ni、Fe和Ga的原子尺寸差异密切相关。
The microstructural properties of melt-spun ribbon of the ferromagnetic shape-memory Heusler alloy Ni{sub 2}FeGa have been investigated by transmission electron microscopy. Two kinds of micromodulated structures, Fe-rich and Ga-rich, have been established. The Fe-rich micromodulated structure is formed by Fe atoms partially replacing Ga atoms on {l_brace}3 5 0{r_brace} planes in the L2{sub 1} structure. The Ga-rich micromodulated structure concerns Ga atoms partially replacing Fe atoms on {l_brace}3 + n, 5 + n, 0{r_brace}(n {>=} 0) planes. The Fe-rich and Ga-rich micromodulated structures originate from spinodal decomposition of the Fe and Ga compositions, which is closely related to the difference of atomic sizes of Ni, Fe and Ga.
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