Kinetics of vacancy migration in hydrogenated palladium
- William Marsh Rice Univ., Houston, TX (United States). Dept. of Mechanical Engineering and Materials Science
Strong attractive interactions between lattice vacancies and interstitial solutes can lead to the formation of vacancy concentrations which, at a given temperature, are much larger than would be observed in thermal equilibrium in the interstitial-free solvent metal. In order to facilitate rapid metal atom diffusion by a vacancy exchange mechanism, the vacancies must be produced in bulk material with sufficient rapidity to account for the observed transformation rates. Thus the kinetic problem is complex because two questions must be addressed. On the one hand there is the problem of the intrinsic mobility of H-decorated vacancies, and on the other hand the kinetics of vacancy production in the bulk hydrogenated lattice. The fact that the rapid transformations are indeed observed indicates that the kinetics are such that both excess vacancy formation and the diffusion of such vacancies are sufficiently rapid at the observed temperatures. The purpose of the present note is to indicate why this is true.
- Sponsoring Organization:
- Welch (Robert A.) Foundation, Houston, TX (United States)
- OSTI ID:
- 474207
- Journal Information:
- Scripta Materialia, Vol. 36, Issue 10; Other Information: PBD: 15 May 1997
- Country of Publication:
- United States
- Language:
- English
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