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Title: Kinetics of long-range order relaxation in Ni{sub 3}Al: The effect of stoichiometry

Abstract

The isothermal relaxation of long-range order (LRO) after small temperature changes has been investigated in Ni{sub 3}Al 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.

Authors:
; ;  [1]
  1. CECM-CNRS, Vitry sur Seine (France)
Publication Date:
OSTI Identifier:
230804
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 44; Journal Issue: 4; Other Information: PBD: Apr 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL ALLOYS; ORDER PARAMETERS; ALUMINIUM ALLOYS; BINARY ALLOY SYSTEMS; INTERMETALLIC COMPOUNDS; CHEMICAL COMPOSITION; ELECTRIC CONDUCTIVITY; EQUILIBRIUM; TEMPERATURE DEPENDENCE; ACTIVATION ENERGY; CORRELATIONS; SELF-DIFFUSION

Citation Formats

Dimitrov, C, Zhang, X, and Dimitrov, O. Kinetics of long-range order relaxation in Ni{sub 3}Al: The effect of stoichiometry. United States: N. p., 1996. Web. doi:10.1016/1359-6454(95)00298-7.
Dimitrov, C, Zhang, X, & Dimitrov, O. Kinetics of long-range order relaxation in Ni{sub 3}Al: The effect of stoichiometry. United States. https://doi.org/10.1016/1359-6454(95)00298-7
Dimitrov, C, Zhang, X, and Dimitrov, O. 1996. "Kinetics of long-range order relaxation in Ni{sub 3}Al: The effect of stoichiometry". United States. https://doi.org/10.1016/1359-6454(95)00298-7.
@article{osti_230804,
title = {Kinetics of long-range order relaxation in Ni{sub 3}Al: The effect of stoichiometry},
author = {Dimitrov, C and Zhang, X and Dimitrov, O},
abstractNote = {The isothermal relaxation of long-range order (LRO) after small temperature changes has been investigated in Ni{sub 3}Al 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.},
doi = {10.1016/1359-6454(95)00298-7},
url = {https://www.osti.gov/biblio/230804}, journal = {Acta Materialia},
number = 4,
volume = 44,
place = {United States},
year = {Mon Apr 01 00:00:00 EST 1996},
month = {Mon Apr 01 00:00:00 EST 1996}
}