Chemical diffusion in L10-ordered FePt

被引：26

作者：

Kushida, A ^{[1
]}

Tanaka, K ^{[1
]}

Numakura, H ^{[1
]}

机构：

[1] Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan

来源：

MATERIALS TRANSACTIONS | 2003年 / 44卷 / 01期

关键词：

chemical diffusion; interdiffusion; ordered alloy; iron-platinum alloy; order-disorder transition; diffusion anisotropy;

D O I：

10.2320/matertrans.44.59

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Diffusion in FePt has been studied with emphasis oil the effect of order-disorder transition by interdiffusion experiments below and above the L1(0)-Al transition temperature. The chemical diffusion coefficient in the disordered state obeys the Arrhenius law with the effective activation energy of 3.1 eV (1 eV = 1.6 x 10(-19) J). Anisotropy of diffusion in the ordered state has been examined using monovariant single-crystals of the tetragonal L1(0) structure. The coefficient of diffusion in the a-axis direction is slightly lower than the extrapolation of the diffusivity from the disordered state while that of diffusion in the c-axis direction deviates significantly toward lower values. The apparent activation energy for the diffusion in the two directions is 3.2 and 3.8 eV, respectively.

引用

页码：59 / 62

页数：4

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