Phase equilibria and stability of ordered b.c.c. phases in the Fe-rich portion of the Fe–Ga system
Phase equilibria and stability of ordered b.c.c. phases in the Fe-rich portion of the Fe–Ga system
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DOI：
10.1016/s0925-8388(02)00791-0
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发表时间：
2002-12
影响因子：
6.2
通讯作者：
O. Ikeda;R. Kainuma;I. Ohnuma;K. Fukamichi;K. Ishida
中科院分区：
文献类型：
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作者：
O. Ikeda;R. Kainuma;I. Ohnuma;K. Fukamichi;K. Ishida
用透射电镜（TEM）、扫描电镜（SEM）和能谱仪（EDS），主要采用传统的扩散偶（DC）技术，测定了Fe-Ga二元系富Fe部分A2、B2、D 03、L12和D 019相的相平衡。研究了亚稳b.c.c.用浓度梯度法（CGM）研究了相区。结果表明，在25 at.%以下的相平衡Ga几乎与评估的相图一致，而Fe 3Ga（L12）单相区域存在高达约30at%Ga和约690°C。A2和D 03相之间的相界，包括亚稳平衡，表现出类似于Fe-Al系的复杂行为。用差示扫描量热法（DSC）研究了A2→B2→ D 03的有序-无序和顺磁→铁磁转变温度。
Phase equilibria among the A2, B2, D03, L12and D019phases in the Fe-rich portion of the Fe–Ga binary system were determined by transmission and scanning electron microscopies (TEM and SEM) and energy dispersion spectroscopy (EDS), mainly using a conventional diffusion couple (DC) technique. The phase stability of the B2 and D03ordered phases in the metastable b.c.c. phase region was also investigated using concentration gradient method (CGM). It was found that the phase equilibria below 25 at.%Ga almost coincide with the assessed phase diagram, whereas the Fe3Ga (L12) single-phase region exists up to about 30 at%Ga and to about 690°C. The phase boundaries between the A2 and D03phases including the metastable equilibrium exhibit a complicated behavior in analogy with the Fe–Al system. The A2→B2→D03order–disorder and the paramagnetic→ferromagnetic transition temperatures were also investigated by differential scanning calorimetry (DSC).