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An investigation of cvity development during superplastic flow in a zinc-aluminum alloy processed using severe plastic deformation

An investigation of cvity development during superplastic flow in a zinc-aluminum alloy processed using severe plastic deformation
An investigation of cvity development during superplastic flow in a zinc-aluminum alloy processed using severe plastic deformation
A Zn–22% Al eutectoid alloy was processed by equal-channel angular pressing for 8 passes at 473 K and then tested in tension at 473 K over a range of strain rates. A highest elongation of 2230% was recorded at a strain rate of 1.0 × 10?2 s?1 representing high strain rate superplasticity. Quantitative cavity measurements and a cavity volume analysis were undertaken to investigate the growth of internal cavities during superplastic flow. The results demonstrate a clear transition from the superplastic diffusion growth of cavities at the lower elongations to plasticity-controlled cavity growth at the higher elongations. A cavity growth diagram provides an excellent description of the cavity growth processes including the transition from superplastic diffusion growth to plasticity-controlled growth at cavity radii larger than ?2.1 µm.
1347-5320
87-95
Kawasaki, M
e72a45f7-304f-410f-ac1e-55145d4923a5
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, M
e72a45f7-304f-410f-ac1e-55145d4923a5
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Kawasaki, M and Langdon, T.G. (2012) An investigation of cvity development during superplastic flow in a zinc-aluminum alloy processed using severe plastic deformation. Materials Transactions, 53 (1), 87-95.

Record type: Article

Abstract

A Zn–22% Al eutectoid alloy was processed by equal-channel angular pressing for 8 passes at 473 K and then tested in tension at 473 K over a range of strain rates. A highest elongation of 2230% was recorded at a strain rate of 1.0 × 10?2 s?1 representing high strain rate superplasticity. Quantitative cavity measurements and a cavity volume analysis were undertaken to investigate the growth of internal cavities during superplastic flow. The results demonstrate a clear transition from the superplastic diffusion growth of cavities at the lower elongations to plasticity-controlled cavity growth at the higher elongations. A cavity growth diagram provides an excellent description of the cavity growth processes including the transition from superplastic diffusion growth to plasticity-controlled growth at cavity radii larger than ?2.1 µm.

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More information

e-pub ahead of print date: 25 December 2011
Published date: 2012
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 334210
URI: https://eprints.soton.ac.uk/id/eprint/334210
ISSN: 1347-5320
PURE UUID: 61f6c049-ced0-4794-b72f-fd2eec457ef1
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 06 Mar 2012 15:23
Last modified: 17 Jul 2019 00:57

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