Thermodynamics of stress-induced interstitial redistribution in body-centered cubic metals

William C. Johnson, Joo Youl Huh

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A set of open-system elastic constants used to approximate the redistribution of interstitial atoms among the three different interstitial sublattices in a body-centered cubic (bcc) metal is derived accounting for the tetragonal nature of the compositional strain in the presence of a nonhydrostatic stress. Predictions of the stress-induced composition change are calculated and compared to the actual solution and to two other approximation schemes, one based on a hydrostatic compositional strain and one based on ignoring the compositional self-stress. The open-system elastic constants give a qualitatively and quantitatively accurate representation of the composition changes when the far-field composition is greater than a few percent. For very small far-field compositions, less than about 10-4, the compositional self-stress can be ignored in calculating the stress-induced interstitial redistribution. However, for larger far-field compositions, neglecting the compositional self-stress can overestimate significantly the degree of interstitial redistribution.

Original languageEnglish
Pages (from-to)2819-2825
Number of pages7
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume34
Issue number12
Publication statusPublished - 2003 Dec 1

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Metals
Thermodynamics
Chemical analysis
Open systems
Elastic constants
Atoms

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

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