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Routes to Develop Fine-Grained Magnesium Alloys and Composites for High-Strain Rate Superplasticity

Published online by Cambridge University Press:  10 February 2011

Toshiji Mukai ,
Hiroyuki Watanabe ,
T. G. Nieh  and
Kenji Higashi
Toshiji Mukai
Affiliation:
Osaka Municipal Technical Research Institute, Osaka 536-8553, Japan, [email protected]
Hiroyuki Watanabe
Affiliation:
Osaka Municipal Technical Research Institute, Osaka 536-8553, Japan, [email protected]
T. G. Nieh
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California, USA
Kenji Higashi
Affiliation:
Dept. of Metallurgy and Materials Science, Osaka Prefecture University, Osaka, Japan
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Abstract

Superplastic properties of magnesium alloys and their composites were reviewed with a special emphasis on the achievement of high strain rate superplastic forming. The role of grain size on superplastic deformation mechanisms was particularly addressed. Commercial Mg-Al-Zn alloys and a ZK60-based composite are used as model materials to illustrate the underlining principles leading to the observation of high strain rate superplasticity. In this paper, experimental results from several processing routes, including thermomechanical processing, severe plastic deformation, and extrusion of machined chips and rapidly solidified powders, are presented. High strain rate superplasticity (HSRS) is demonstrated in ZK60-based composites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 291
Copyright
Copyright © Materials Research Society 2000

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