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

Record type: Article

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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Citation

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), pp. 24-29. (doi:10.1016/j.msea.2009.03.032).

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: http://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: 18 Jul 2017 23:55

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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
Author: T.G. Langdon ORCID iD

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