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Solute-Vacancy Interactions in Nickel

Published online by Cambridge University Press:  09 January 2014

Julie D. Tucker
Julie D. Tucker*
Affiliation:
Oregon State University, 204 Rogers Hall, Corvallis, OR 97330
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Abstract

Solute trapping of vacancies in a Ni host lattice is a first step to understanding how solute additions may effect ordering phase transformation in Ni-based alloys. Minor additions of solutes (<3 wt.%) may not have an appreciable effect on the thermodynamics of phase stability but strong binding between the vacancy and solute may significantly alter the kinetics of phase transformations. In this work vacancy-solute binding energies are calculated for multiple elements (Cr, Fe, Mn, Si, Ti, Nb, Ta, Cu, Al, Mo) in a pure Ni face-centered cubic lattice. These elements are common in corrosion-resistant Ni-based alloys. Binding enthalpies for the first four nearest-neighbor vacancy-solute pairs are reported for all elements. The results of this study show that Si, Ti, Nb and Ta bind to vacancies in the first nearest-neighbor position. Alloys containing these solute additions may experience delayed phase transformation due to vacancy trapping that slows diffusion.

Keywords

defectsNiphase transformation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1645: Symposium EE/ZZ – Advanced Materials in Extreme Environments , 2014 , mrsf13-1645-ee08-08
Copyright
Copyright © Materials Research Society 2014 

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