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 language | English |
|---|---|
| Pages (from-to) | 2819-2825 |
| Number of pages | 7 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 34 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2003 Dec |
Bibliographical note
Funding Information:We gratefully acknowledge the fruitful conversations with J.R. Scully and R.P. Gangloff and the financial support of the United State National Science Foundation through Grant No. DMR-9902110 (WCJ) and a Korea University Grant (JYH).
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys