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Grain Boundary Precipitate Density as a Function of Time and 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 variation of θ (CuAI2) precipitate density as a function of heat treatment time and grain boundary misorientation was investigated in an Al-5 wt % Cu alloy. In this study, precipitate densities have been quantitatively linked to grain boundary structure. It was found that, for a given heat treatment time, the precipitate density varied in a reproducible manner (108 to 1010 ppts/cm2) as a function of misorientation between the grains (20 to 60 degrees). Additionally, misorientation was found to be the most important factor governing the precipitate density at a given grain boundary. The grain boundary plane orientation played a secondary role in determining the precipitate density. Bollmann O-lattice modeling allows comparison of the relative effects of grain boundary plane orientation relative to the misorientation between grains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 319: Symposia CB – Defect-Interface Interactions , 1993 , 357
Copyright
Copyright © Materials Research Society 1994

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