Developing superplasticity and a deformation mechanism map for the Zn–Al eutectoid alloy processed by high-pressure torsion
Developing superplasticity and a deformation mechanism map for the Zn–Al eutectoid alloy processed by high-pressure torsion
A Zn–22% Al eutectoid alloy was processed by high-pressure torsion (HPT) for 1, 3 and 5 turns at room temperature to produce an ultrafine grain size of ?350 nm. Tensile testing at a temperature of 473 K gave excellent superplastic properties with elongations to failure up to a maximum of 1800% at an imposed strain rate of 1.0 × 10?1 s?1: this is within the range of high strain rate superplasticity and represents the highest elongation recorded to date for a specimen processed by HPT. It is shown that the experimental data are in excellent agreement with a deformation mechanism map constructed for a temperature of 473 K
deformation mechanism maps, flow mechanisms, high-pressure torsion, superplasticity, ultrafine grains
6140-6145
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
25 July 2011
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Kawasaki, Megumi and Langdon, Terence G.
(2011)
Developing superplasticity and a deformation mechanism map for the Zn–Al eutectoid alloy processed by high-pressure torsion.
Materials Science and Engineering: A, 528 (19-20), .
(doi:10.1016/j.msea.2011.04.053).
Abstract
A Zn–22% Al eutectoid alloy was processed by high-pressure torsion (HPT) for 1, 3 and 5 turns at room temperature to produce an ultrafine grain size of ?350 nm. Tensile testing at a temperature of 473 K gave excellent superplastic properties with elongations to failure up to a maximum of 1800% at an imposed strain rate of 1.0 × 10?1 s?1: this is within the range of high strain rate superplasticity and represents the highest elongation recorded to date for a specimen processed by HPT. It is shown that the experimental data are in excellent agreement with a deformation mechanism map constructed for a temperature of 473 K
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e-pub ahead of print date: 22 April 2011
Published date: 25 July 2011
Keywords:
deformation mechanism maps, flow mechanisms, high-pressure torsion, superplasticity, ultrafine grains
Organisations:
Bioengineering Group
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Local EPrints ID: 335076
URI: http://eprints.soton.ac.uk/id/eprint/335076
ISSN: 0921-5093
PURE UUID: f8e31c74-c3d9-45a8-8046-949c06176c2b
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Date deposited: 14 Mar 2012 08:48
Last modified: 15 Mar 2024 03:13
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Author:
Megumi Kawasaki
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