Chinh, N.Q., Csanádi, T., Györi, T., Valiev, R.Z., Straumal, B.B., Kawasaki, M. and Langdon, T.G.
Strain rate sensitivity studies in an ultrafine-grained Al-30wt.%Zn alloy using micro- and nano-indentation
Materials Science and Engineering: A, 543, . (doi:10.1016/j.msea.2012.02.056).
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The characteristics of plastic deformation of an ultrafine-grained (UFG) Al–30 wt.% Zn alloy were investigated using depth-sensing micro- and nanoindentation. Emphasis was placed on the effects of grain boundaries and the unusually high strain rate sensitivity. It is shown that there is a close relationship between enhanced strain rate sensitivity and ductility in this UFG material and this is associated with grain boundary sliding and enhanced diffusion along the Al/Al grain boundaries which appear to be wetted by Zn-rich layers.
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