Langdon, Terence G. (2014) The flow behavior of ultrafine-grained materials. Advanced Materials Research, 1013, 7-14. (doi:10.4028/www.scientific.net/AMR.1013.7).
Abstract
Processing through the application of severe plastic deformation (SPD) leads to very significant grain refinement with grains that are typically in the submicrometer or even the nanometer range. These ultrafine-grained (UFG) materials provide an opportunity for achieving exceptional flow properties including high strength at ambient temperature and, if the very small grains are reasonably stable, superplastic elongations at high testing temperatures. These flow characteristics are examined for materials processed using the two SPD procedures of equal-channel angular pressing (ECAP) and high-pressure torsion (HPT).
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