Structural investigations of Fe–Ga alloys: Phase relations and magnetostrictive behavior
Structural investigations of Fe–Ga alloys: Phase relations and magnetostrictive behavior
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DOI：
10.1016/j.actamat.2008.05.011
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发表时间：
2008-09
期刊：
影响因子：
9.4
通讯作者：
Q. Xing;Y. Du;R. McQueeney;T. Lograsso
中科院分区：
文献类型：
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作者：
Q. Xing;Y. Du;R. McQueeney;T. Lograsso
Fe-Ga合金的磁致伸缩(3/2)λ_(100)与Ga含量之间的内在关系是一个悬而未决的问题。本文利用透射电子显微镜和X射线衍射仪系统地研究了Fe-Ga合金的结构与性能的关系。结果表明，在(3/2)λ100单调增加的区域，慢冷合金存在单相A2或D03。对于18-21at.%Ga的合金，淬火使单相A2扩展到更高的Ga浓度，从而继续增强磁致伸缩。Fe-19at.%Ga和Fe-29at.%Ga附近(3/2)λ_(100)的突然降低与相混合物的形成有关。对于25~29at.%Ga的淬火合金，发现了(A2+B2+D03)相混合物，但该相混合物的存在似乎对磁致伸缩影响不大。
The underlying relation between the magnetostriction (3/2) λ100and Ga concentration for Fe–Ga alloys is an open question. This work presents a systematic structural study of the structure-property dependence of Fe–Ga alloys by transmission electron microscopy and X-ray diffraction. Results show that in the regions where monotonic increases in (3/2) λ100are exhibited, single-phase A2 or D03is found for the slow-cooled alloys. For the alloys in the range 18–21at.% Ga, quenching extends the single-phase A2 to higher Ga concentrations, thereby continuing to enhance magnetostriction. The sudden decrease in (3/2) λ100near Fe–19at.% Ga as well as Fe–29at.% Ga was associated with the formation of phase mixtures. For quenched alloys between 25 and 29at.% Ga, a phase mixture of (A2+B2+D03) was found, but the presence of this phase mixture does not seem to have a large effect on magnetostriction.