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Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP

Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP
Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP
A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) at 473 K to produce a grain size of not, vert, similar0.8 ?m and it was then tested under dynamic conditions at strain rates up to 4.0 × 103 s?1 using a split-Hopkinson bar. The stress–strain curves in dynamic testing exhibited upwards concave curvature suggesting the occurrence of twinning. Examination by transmission electron microscopy showed that dislocation slip played a major role in the flow behavior with dislocation accumulation as the main source of work hardening. An identification of Burgers vectors revealed the extensive presence of prismatic dislocations. Rod-shaped Mg1(Zn,Zr)1 precipitates present in the as-received alloy become fragmented and overaged during ECAP
dynamic testing, equal-channel angular pressing, magnesium alloy, twinning, ultrafine-grained structure
0921-5093
24-29
Li, B.
c23bc593-3c5b-4eeb-bec0-43aceb2a534c
Joshi, S.
6b47d322-aa25-4ab3-a07d-023a3a302ce3
Azevedo, K.
3f0082c2-90ce-41fb-8aeb-b007c80128e4
Ma, E.
017d1a0f-a3a8-4ee8-aded-f313014af2d1
Ramesh, K.T.
dc450f16-9881-4758-a7f2-d0836d1ca4c7
Figueiredo, R.B.
1b4f5fa6-b201-4435-8f5e-13833fc8d504
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Li, B.
c23bc593-3c5b-4eeb-bec0-43aceb2a534c
Joshi, S.
6b47d322-aa25-4ab3-a07d-023a3a302ce3
Azevedo, K.
3f0082c2-90ce-41fb-8aeb-b007c80128e4
Ma, E.
017d1a0f-a3a8-4ee8-aded-f313014af2d1
Ramesh, K.T.
dc450f16-9881-4758-a7f2-d0836d1ca4c7
Figueiredo, R.B.
1b4f5fa6-b201-4435-8f5e-13833fc8d504
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Li, B., Joshi, S., Azevedo, K., Ma, E., Ramesh, K.T., Figueiredo, R.B. and Langdon, T.G. (2009) Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP. Materials Science and Engineering: A, 517 (1-2), 24-29. (doi:10.1016/j.msea.2009.03.032).

Record type: Article

Abstract

A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) at 473 K to produce a grain size of not, vert, similar0.8 ?m and it was then tested under dynamic conditions at strain rates up to 4.0 × 103 s?1 using a split-Hopkinson bar. The stress–strain curves in dynamic testing exhibited upwards concave curvature suggesting the occurrence of twinning. Examination by transmission electron microscopy showed that dislocation slip played a major role in the flow behavior with dislocation accumulation as the main source of work hardening. An identification of Burgers vectors revealed the extensive presence of prismatic dislocations. Rod-shaped Mg1(Zn,Zr)1 precipitates present in the as-received alloy become fragmented and overaged during ECAP

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More information

Published date: 20 August 2009
Keywords: dynamic testing, equal-channel angular pressing, magnesium alloy, twinning, ultrafine-grained structure
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 72195
URI: https://eprints.soton.ac.uk/id/eprint/72195
ISSN: 0921-5093
PURE UUID: 1776b212-edb0-4b91-940c-aebe46cb97bd
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 29 Jan 2010
Last modified: 06 Jun 2018 12:48

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