Computer Simulation of Grain Boundary Character in a Superplastic Aluminum Alloy

Autor: María Teresa Pérez-Prado, T.R. McNelley
Rok vydání: 1999
Předmět:
Zdroj: MRS Proceedings. 601
ISSN: 1946-4274
0272-9172
DOI: 10.1557/proc-601-3
Popis: 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 (
Databáze: OpenAIRE
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