Tracer diffusion in Pt3Fe ordered alloys

被引:0
作者
Nosé, Y
Ikeda, T
Nakajima, H
Numakura, H
机构
[1] Osaka Univ, Dept Met Mat Proc, Inst Sci & Ind Res, Ibaraki, Osaka 5670047, Japan
[2] Kyoto Univ, Dept Mat Sci & Engn, Kyoto, Japan
来源
ZEITSCHRIFT FUR METALLKUNDE | 2004年 / 95卷 / 10期
关键词
L1(2) structure; order-disorder alloy; iron-platinum alloy; tracer diffusion; diffusion mechanism;
D O I
10.3139/146.018040
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Tracer diffusion coefficients of Fe and Pd in L1(2)-Pt3Fe ordered alloys have been measured in the temperature range between 1223 K and 1663 K, which is through the order-disorder transformation temperature. The diffusion coefficient of Fe, D-Fe(*), increases with increasing Fe composition, while that of Pd, D-Pd(*), is almost independent of the composition. Both diffusion coefficients obey the Arrhenius law at temperatures up to 1374 K, while in the higher temperature range approaching the order-disorder transformation temperature, they show upward curvature. In the higher temperature range it has also been observed that the diffusion coefficient of Fe is larger than that of Pd, which is opposite to the diffusion behavior at lower temperatures. Using defect concentrations calculated by the thermodynamic model, the diffusion behavior in Pt3Fe ordered alloys can be understood within the framework of the alpha sublattice vacancy mechanism.
引用
收藏
页码:904 / 912
页数:9
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