Experimental and theoretical studies on phase separations in the Fe-Al-Co ordering alloy system
Experimental and theoretical studies on phase separations in the Fe-Al-Co ordering alloy system
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Fe-Al-Co有序合金系相分离的实验与理论研究
DOI：
10.1007/bf00445974
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发表时间：
1994
影响因子：
4.5
通讯作者：
T. Miyazaki
中科院分区：
文献类型：
--
作者：
T. Kozakai;T. Miyazaki
用透射电子显微镜、差热分析和磁化强度测量等方法研究了富铁Fe-Al-Co三元合金的相分离。在923K发现了两种相分离：A2+B2和B2+B2*。前者出现在Fe-12 at%Al-15 at%Co到Fe-35 at%Al-45 at%Co的舌状成分区域，后者出现在A2+B_2场Fe-Al二元边上的小区域。这些两相场已经在所谓的布拉格-威廉姆斯-戈尔斯基模型的基础上进行了理论上的评估，该模型不仅考虑了化学作用，还考虑了磁相互作用。磁有序解释了A2+B2共存区的扩展。在磁性能测量中，观察到两相微结构中的矫顽力Hc和剩余磁通密度BR有较大的增加。
Phase separations in iron-rich Fe-Al-Co ternary alloys were investigated by means of transmission electron microscopy, differential thermal analysis and magnetization measurement. Two kinds of phase separations have been found at 923 K; A2+B2 and B2+B2*. The former occurs in a tongue-shaped composition region ranging from Fe-12 at % Al-15 at % Co to Fe-35 at % Al-45 at % Co and the latter appears in the small region bordering on the Fe-Al binary side of the A2+B2 field. These two-phase fields have theoretically been evaluated on the basis of the so-called Bragg-Williams-Gorsky model taking account of not only chemical but also magnetic interactions. The magnetic ordering accounts for the expansion of the A2+B2 coexistent region. In the measurement of magnetic properties, large increases in coercive force,Hc, and residual magnetic flux density,Br, were observed in the two-phase microstructures.