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Computer Simulation of Grain Boundary Character in a Superplastic Aluminum Alloy

Published online by Cambridge University Press:  10 February 2011

T.R. McNelley  and
M.T. Peréz-Prado
T.R. McNelley
Affiliation:
Department of Mechanical Engineering, Naval Postgraduate School, 700 Dyer Road, Monterey, CA 93943-5146; [email protected]
M.T. Peréz-Prado
Affiliation:
Materials Science Group, Department of Mechanical and Aerospace Engineering, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0411; [email protected]
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Abstract

High-angle grain boundaries are generally deemed necessary for superplasticity in metals. In polycrystalline materials the grain boundary character must be described in terms of a probability distribution rather than by a single parameter, and little has been reported on the relationship between this distribution and fine-grain superplasticity. For aluminum alloys that exhibit continuous recrystallization the results of computer-aided electron backscatter diffraction analysis have shown that bimodal grain boundary disorientation distributions are present in as-processed material and persist during subsequent annealing. Such distributions may be simulated by computer methods based on a model of the microstructure which assumes that deformation banding occurs during deformation processing. High-angle boundaries (≥30°) develop in association with deformation banding while boundaries of lower disorientation (<30°) develop by dislocation reaction within the bands. Improved understanding of the grain boundary types associated with various microstructural transformation mechanisms will aid the design of processes to produce superplastic microstructures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 3
Copyright
Copyright © Materials Research Society 2000

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