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
24-29
Li, B.
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Joshi, S.
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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
20 August 2009
Li, B.
a8225836-5ea0-4274-8d4f-57a50a26ed59
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), .
(doi:10.1016/j.msea.2009.03.032).
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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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: http://eprints.soton.ac.uk/id/eprint/72195
ISSN: 0921-5093
PURE UUID: 1776b212-edb0-4b91-940c-aebe46cb97bd
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Date deposited: 29 Jan 2010
Last modified: 14 Mar 2024 02:47
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Contributors
Author:
B. Li
Author:
S. Joshi
Author:
K. Azevedo
Author:
E. Ma
Author:
K.T. Ramesh
Author:
R.B. Figueiredo
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