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Fabrication of submicrometer-grained Zn–22% Al by torsion straining

Published online by Cambridge University Press:  31 January 2011

Minoru Furukawa ,
Zenji Horita ,
Minoru Nemoto ,
Ruslan Z. Valiev  and
Terence G. Langdon
Minoru Furukawa
Affiliation:
Department of Technology, Fukuoka University of Education, Munakata, Fukuoka 811–41, Japan
Zenji Horita
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812–81, Japan
Minoru Nemoto
Affiliation:
Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812–81, Japan
Ruslan Z. Valiev
Affiliation:
Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa 450000, Russia
Terence G. Langdon
Affiliation:
Departments of Materials Science and Mechanical Engineering, University of Southern California, Los Angeles, California 90089–1453
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Abstract

The Zn–22% Al eutectoid alloy is capable of exhibiting very high superplastic elongations, in excess of 2000% in tension, when the grain size is in the range of ∼ 1–10 μm. This paper describes the fabrication of a submicrometer grain size in the Zn–22% Al alloy by subjecting the samples to intense plastic straining in torsion under high pressure (∼5 GPa) at room temperature. Observations after straining revealed a heterogeneous microstructure with grain sizes in the range of ∼0.1–0.5 μm. As a result of the low melting temperature of the alloy, the high internal stresses introduced by torsion straining are relaxed and the grain boundaries are close to an equilibrium configuration.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 9 , September 1996 , pp. 2128 - 2130
Copyright
Copyright © Materials Research Society 1996

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References

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