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Superplasticity in P/M Aluminium Alloys

Published online by Cambridge University Press:  16 February 2011

K. Higashi ,
S. Tanimura  and
T. Ito
K. Higashi
Affiliation:
Department of Mechanical Engineering, College of Engineering, University of Osaka Prefecture, Mozu-Umemachl, Sakal, Osaka 591, Japan
S. Tanimura
Affiliation:
Department of Mechanical Engineering, College of Engineering, University of Osaka Prefecture, Mozu-Umemachl, Sakal, Osaka 591, Japan
T. Ito
Affiliation:
Department of Metallurgical Engineering, College of Engineering, University of Osaka Prefecture, Mozu-Umemachl, Sakal, Osaka 591, Japan
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Abstract

Recent advances in the technologies of powder metallurgy lead to the development of some superplastic aluminium alloys containing a deliberate addition of a large amount of Zr and /or Cr and Mn that exhibit the high strain rates superplasticity. For a few alloy systems, the large elongation more than 500% has been observed over the strain rates of 1×10−1s−1, which rates are two or three orders of magnitude faster than those at which superplasticity is found in conventional superplastic aluminium alloys produced by ingot metallurgy. The high strain-rates superplasticity obtained in both type of fully static recrystallized and dynamic recrystallized P/M aluminium alloys. The decreasing of initial size of grains and/or sub-grains leads to the increasing the strain-rates for superplastic flow in both types of alloys. The refinement of grains or sub-grains size is one of necessary and important to obtain the high strain-rates superplasticity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 385
Copyright
Copyright © Materials Research Society 1990

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References

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