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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 ,
C.H. Henager Jr.  and
E.P. Simonen
J.S. Vetrano
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, john.vetrano@pnl.gov
C.H. Henager Jr.
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, john.vetrano@pnl.gov
E.P. Simonen
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352, john.vetrano@pnl.gov
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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
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 169
Copyright
Copyright © Materials Research Society 2000

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