The development of internal cavitation in a superplastic zinc-aluminum alloy processed by ECAP
The development of internal cavitation in a superplastic zinc-aluminum alloy processed by ECAP
A Zn-22% Al eutectoid alloy was processed by Equal-Channel Angular Pressing (ECAP) to produce an ultrafine grain size and then pulled in tension at elevated temperatures to evaluate the role of internal cavitation under superplastic conditions. Tensile testing yielded a highest elongation of 2,230% at a strain rate of 1.0 × 10?2 s?1 at 473 K representing high strain rate superplasticity. Quantitative cavity measurements were taken to investigate the significance of the internal cavities formed during superplastic deformation. The results demonstrate that cavity nucleation occurs continuously throughout superplastic flow, and there is a transition in the cavity growth mechanism from superplastic diffusion growth at the smaller cavity sizes to plasticity-controlled growth at the larger sizes.
7360-7365
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
December 2008
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi and Langdon, Terence G.
(2008)
The development of internal cavitation in a superplastic zinc-aluminum alloy processed by ECAP.
Journal of Materials Science, 43 (23-24), .
(doi:10.1007/s10853-008-2771-2).
Abstract
A Zn-22% Al eutectoid alloy was processed by Equal-Channel Angular Pressing (ECAP) to produce an ultrafine grain size and then pulled in tension at elevated temperatures to evaluate the role of internal cavitation under superplastic conditions. Tensile testing yielded a highest elongation of 2,230% at a strain rate of 1.0 × 10?2 s?1 at 473 K representing high strain rate superplasticity. Quantitative cavity measurements were taken to investigate the significance of the internal cavities formed during superplastic deformation. The results demonstrate that cavity nucleation occurs continuously throughout superplastic flow, and there is a transition in the cavity growth mechanism from superplastic diffusion growth at the smaller cavity sizes to plasticity-controlled growth at the larger sizes.
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Published date: December 2008
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 64571
URI: http://eprints.soton.ac.uk/id/eprint/64571
ISSN: 0022-2461
PURE UUID: 92248de6-3dc4-4b27-84c7-ee31803a5542
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Date deposited: 08 Jan 2009
Last modified: 16 Mar 2024 03:28
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Author:
Megumi Kawasaki
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