Grain boundary sliding in a superplastic zinc-aluminum alloy processed using severe plastic deformation
Grain boundary sliding in a superplastic zinc-aluminum alloy processed using severe plastic deformation
A Zn-22% Al eutectoid alloy was processed by Equal-Channel Angular Processing (ECAP) to produce a grain size of ?0.8 ?m. Tensile testing at 473 K gave a maximum elongation of ?2230% at a strain rate of 1.0 × 10-2 s-1. The significance of grain boundary sliding was evaluated by taking measurements of offsets in surface marker lines at an elongation of 30%. The highest sliding contribution was recorded under testing conditions corresponding to the maximum superplastic elongation. Detailed measurements showed that relatively large offsets occurred at the Zn-Zn and Zn-Al interfaces but there were smaller offsets at the Al-Al interfaces. It is concluded that grain boundary sliding is the dominant flow process during superplastic deformation.
84-89
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
1 January 2008
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi and Langdon, Terence G.
(2008)
Grain boundary sliding in a superplastic zinc-aluminum alloy processed using severe plastic deformation.
Materials Transactions, 49 (1), .
(doi:10.2320/matertrans.ME200720).
Abstract
A Zn-22% Al eutectoid alloy was processed by Equal-Channel Angular Processing (ECAP) to produce a grain size of ?0.8 ?m. Tensile testing at 473 K gave a maximum elongation of ?2230% at a strain rate of 1.0 × 10-2 s-1. The significance of grain boundary sliding was evaluated by taking measurements of offsets in surface marker lines at an elongation of 30%. The highest sliding contribution was recorded under testing conditions corresponding to the maximum superplastic elongation. Detailed measurements showed that relatively large offsets occurred at the Zn-Zn and Zn-Al interfaces but there were smaller offsets at the Al-Al interfaces. It is concluded that grain boundary sliding is the dominant flow process during superplastic deformation.
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Submitted date: 2007
Accepted/In Press date: 2007
e-pub ahead of print date: 25 December 2007
Published date: 1 January 2008
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 48991
URI: http://eprints.soton.ac.uk/id/eprint/48991
ISSN: 1347-5320
PURE UUID: cb38258c-aead-4e57-a1b4-ba8b8694675c
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Date deposited: 26 Oct 2007
Last modified: 16 Mar 2024 03:28
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Author:
Megumi Kawasaki
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