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Title: Dynamic testing at high strain rates of an ultrafine-grained magnesium alloy processed by ECAP
Authors: Li, B.
Joshi, S. 
Azevedo, K.
Ma, E.
Ramesh, K.T.
Figueiredo, R.B.
Langdon, T.G.
Keywords: Dynamic testing
Equal-channel angular pressing
Magnesium alloy
Ultrafine-grained structure
Issue Date: 20-Aug-2009
Citation: Li, B., Joshi, S., Azevedo, K., Ma, E., Ramesh, K.T., Figueiredo, R.B., Langdon, T.G. (2009-08-20). 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. ScholarBank@NUS Repository.
Abstract: A ZK60 magnesium alloy was processed by equal-channel angular pressing (ECAP) at 473 K to produce a grain size of ∼0.8 μm 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. © 2009 Elsevier B.V. All rights reserved.
Source Title: Materials Science and Engineering A
ISSN: 09215093
DOI: 10.1016/j.msea.2009.03.032
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