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

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).

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


Local EPrints ID: 72195
ISSN: 0921-5093
PURE UUID: 1776b212-edb0-4b91-940c-aebe46cb97bd
ORCID for T.G. Langdon: ORCID iD

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Date deposited: 29 Jan 2010
Last modified: 18 Jul 2017 23:55

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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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