Microstructural Evolution by Continuous Recrystallization in a Superplastic Al-Mg Alloy
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Authors
Hales, S.J.
McNelley, T.R.
Subjects
Advisors
Date of Issue
1988
Date
Publisher
Pergamon Press plc.
Language
Abstract
The boundary misorientations in an Al-1OMg-O.1Zr (wt%) alloy, thermomechanically processed by rolling at 573 K (300°C), were determined both in annealed and in superplastically deformed conditions. A high initial dislocation density in as-rolled material, which obscured any underlying structure, rapidly transformed into a well-defined structure containing boundaries. After annealing for 600 s at 573K, boundaries with misorientations of 1–5° were observed. With further annealing (3000 s), misorientations did not change appreciably and were measured to be 2–7°. Such time represents that necessary to equilibrate at 573K prior to tension testing at that temperature. The material exhibits superplasticity from the onset of deformation and after 100% strain, misorientations were observed to increase to 20–30°. It was concluded that boundaries of such initial misorientations can support superplastic deformation mechanisms including grain boundary sliding.
Type
Article
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
U.S. Naval Air Systems Command
University of Illinois
University of Illinois
Funder
Format
11 p.
Citation
Hales, S. J., and T. R. McNelley. "Microstructural evolution by continuous recrystallization in a superplastic Al-Mg alloy." Acta Metallurgica 36.5 (1988): 1229-1239.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.