Li, B., Joshi, S., Azevedo, K., Ma, E., Ramesh, K.T., Figueiredo, R.B. and Langdon, T.G.
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).
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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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