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Flow behavior of a superplastic Zn–22% Al alloy processed by equal-channel angular pressing

Flow behavior of a superplastic Zn–22% Al alloy processed by equal-channel angular pressing
Flow behavior of a superplastic Zn–22% Al alloy processed by equal-channel angular pressing
A Zn–22% Al eutectoid alloy was processed using equal-channel angular pressing (ECAP) to reduce the grain size to 0.8 ?m. A maximum elongation of 2230% was recorded in tensile testing at 473 K at a strain rate of 1.0 × 10?2 s?1. The significance of grain boundary sliding was evaluated by measuring the offsets in surface marker lines for samples pulled to an elongation of 30% at three different strain rates. The highest sliding contribution was recorded under testing conditions corresponding to the maximum superplastic elongation. Detailed measurements showed that relatively high sliding offsets were recorded at the Zn–Zn and Zn–Al interfaces whereas the offsets were smaller at the Al–Al interfaces. The measurements show that grain boundary sliding is a major flow process during superplastic deformation in the Zn–22% Al alloy processed by ECAP.
0921-5093
48-51
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Kawasaki, Megumi and Langdon, Terence G. (2009) Flow behavior of a superplastic Zn–22% Al alloy processed by equal-channel angular pressing. Materials Science and Engineering: A, 503 (1-2), 48-51. (doi:10.1016/j.msea.2008.04.081).

Record type: Article

Abstract

A Zn–22% Al eutectoid alloy was processed using equal-channel angular pressing (ECAP) to reduce the grain size to 0.8 ?m. A maximum elongation of 2230% was recorded in tensile testing at 473 K at a strain rate of 1.0 × 10?2 s?1. The significance of grain boundary sliding was evaluated by measuring the offsets in surface marker lines for samples pulled to an elongation of 30% at three different strain rates. The highest sliding contribution was recorded under testing conditions corresponding to the maximum superplastic elongation. Detailed measurements showed that relatively high sliding offsets were recorded at the Zn–Zn and Zn–Al interfaces whereas the offsets were smaller at the Al–Al interfaces. The measurements show that grain boundary sliding is a major flow process during superplastic deformation in the Zn–22% Al alloy processed by ECAP.

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More information

Published date: 2009
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 67621
URI: https://eprints.soton.ac.uk/id/eprint/67621
ISSN: 0921-5093
PURE UUID: 2fe45d1c-ad4b-4bf5-ac65-c95fb2b76c29
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 02 Sep 2009
Last modified: 06 Jun 2018 12:48

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