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Role of Vacancies and Solute Atoms on Grain Boundary Sliding

Published online by Cambridge University Press:  10 February 2011

J.S. Vetrano
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, [email protected]
C.H. Henager Jr.
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, [email protected]
E.P. Simonen
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, [email protected]
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Abstract

It is necessary for grain boundary dislocations to slide and climb during the grain boundary sliding process that dominates fine-grained superplastic deformation. The process of climb requires either an influx of vacancies to the grain boundary plane or a local generation of vacancies. Transmission electron microscopy (TEM) observations of grain boundaries in superplastically deformed Al-Mg-Mn alloys quenched under load from the deformation temperature have revealed the presence of nano-scale cavities resulting from a localized supersaturation of vacancies at the grain boundary. Compositional measurements along interfaces have also shown an effect of solute atoms on the local structure. This is shown to result from a coupling of vacancy and solute atom flows during deformation and quenching. Calculations of the localized vacancy concentration indicate that the supersaturation along the grain boundary can be as much as a factor often. The effects of the local supersaturation and solute atom movement on deformation rates and cavity nucleation and growth will be discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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