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), 24-29. (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 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
|Keywords:||dynamic testing, equal-channel angular pressing, magnesium alloy, twinning, ultrafine-grained structure|
|Subjects:||T Technology > TN Mining engineering. Metallurgy
T Technology > TA Engineering (General). Civil engineering (General)
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
|Date Deposited:||29 Jan 2010|
|Last Modified:||27 Mar 2014 18:51|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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