Kawasaki, Megumi, Balasubramanian, N. and Langdon, Terence G.
Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity
Materials Science and Engineering: A, 528, (21), . (doi:10.1016/j.msea.2011.05.005).
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An analysis was conducted to examine the flow behavior of ultrafine-grained (UFG) metals produced by severe plastic deformation (SPD) processing in equal-channel angular pressing. The results reveal two distinct types of behavior. At elevated temperatures, the analysis shows that superplastic flow is accurately described by the theoretical mechanism developed for coarse-grained metals so that flow in UFG materials may be interpreted using conventional flow mechanisms. By contrast, localized small-scale grain boundary sliding is observed during deformation at low temperatures and this is attributed to the movement of extrinsic dislocations in the non-equilibrium grain boundaries produced by SPD processing
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