Kinetics of long-range order relaxation in Ni3Al: The effect of stoichiometry

被引：23

作者：

Dimitrov, C

Zhang, X

Dimitrov, O

机构：

[1] CECM-CNRS, F94407 Vitry sur Seine Cedex

来源：

ACTA MATERIALIA | 1996年 / 44卷 / 04期

关键词：

D O I：

10.1016/1359-6454(95)00298-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The isothermal relaxation of long-range order (LRO) after small temperature changes has been investigated in Ni3Al intermetallic compounds (with 24.6, 25.0 and 26.5 at% Al) by measurements of the residual electrical resistivity. The equilibrium residual electrical resistivities were found to be consistent with theoretically calculated values of the LRO parameter. The approach to equilibrium could be satisfactorily represented by a sum of two exponentials; the relaxation rate is minimum at the stoichiometric composition. The activation enthalpies of the two processes are not significantly different (2.63-2.88 eV); they do not display an important composition dependence. A model is proposed for explaining the existence of the two isothermal relaxation processes.

引用

页码：1691 / 1699

页数：9

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