TY - JOUR
T1 - Thermodynamics of stress-induced interstitial redistribution in body-centered cubic metals
AU - Johnson, William C.
AU - Huh, J. Y.
N1 - 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).
PY - 2003/12
Y1 - 2003/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=3142688936&partnerID=8YFLogxK
U2 - 10.1007/s11661-003-0183-0
DO - 10.1007/s11661-003-0183-0
M3 - Article
AN - SCOPUS:3142688936
SN - 1073-5623
VL - 34
SP - 2819
EP - 2825
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 12
ER -