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Growth of Grain Boundary Precipitates as a Function of Misorientation in an Al-5 WT% Cu Alloy

Published online by Cambridge University Press:  21 February 2011

M. A. Cantrell  and
G. J. Shiflet
M. A. Cantrell
Affiliation:
Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22903
G. J. Shiflet
Affiliation:
Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22903
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Abstract

The size evolution of θ phase (CuAl2) precipitates as a function of time was used to study the growth of grain boundary precipitates in an Al-5 wt % Cu alloy. The kinetics were: modeled using the Brailsford and Aaron treatment of the collector plate mechanism. It was found, for a given time, that the size varied in a reproducible manner as a function of misorientation between the grains. Precipitate size was found to vary from 5 x 10-6 cm to 5 x 10-5 cm, while misorientation varied from 20 to 50 degrees for a given heat treatment period. Grain boundary misorientation was determined to be the most important factor influencing precipitate size for a given grain boundary. The grain boundary plane orientation plays a secondary role in the growth of precipitates. From these data, the relationship between grain boundary misorientation and grain boundary diffusion has been determined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 319: Symposia CB – Defect-Interface Interactions , 1993 , 351
Copyright
Copyright © Materials Research Society 1994

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