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Superplastic Deformation Behavior of Zn-Al Alloys

Published online by Cambridge University Press:  10 February 2011

Tae Kwon Ha ,
Hyun Woo Koo ,
Tae Shin Eom  and
Young Won Chang
Tae Kwon Ha
Affiliation:
Center for Advanced Aerospace Materials (CAAM)Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, South Korea
Hyun Woo Koo
Affiliation:
Center for Advanced Aerospace Materials (CAAM)Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, South Korea
Tae Shin Eom
Affiliation:
Center for Advanced Aerospace Materials (CAAM)Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, South Korea
Young Won Chang
Affiliation:
Center for Advanced Aerospace Materials (CAAM)Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, South Korea
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Abstract

The superplastic deformation behavior of a quasi-single phase Zn-0.3 wt.% Al and a microduplex Zn-22 wt.% Al eutectoid alloy has been investigated in this study within the framework of the internal variable theory of structural superplasticity (SSP). Load relaxation and tensile tests were conducted at room temperature for quasi-single phase alloy and at 200°C for eutectoid alloy. The flow curves obtained from load relaxation tests on superplastic Zn-Al alloys were shown to consist of the contributions from interface sliding (IS) and the accommodating plastic deformation due to dislocation activities. The IS behavior could be described as a viscous flow characterized by the power index value of Mg = 0.5. In the case of quasi-single phase Zn-0.3 wt.% Al alloy with the average grain size of 1 µm, a large elongation of about 1400 % was obtained at room temperature. In a relatively large-grained (10 µm) single-phase alloy, however, grain boundary sliding (GBS) was not expected from the analysis based on the internal variable theory of SSP.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 37
Copyright
Copyright © Materials Research Society 2000

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