Authors: Roberto B Figueiredo Terence G Langdon
Publish Date: 2009/09/01
Volume: 44, Issue: 17, Pages: 4758-4762
Abstract
Processing through the application of severe plastic deformation SPD provides a useful tool for introducing very significant grain refinement in bulk solids 1 Although several SPD techniques are now available processing by equalchannel angular pressing ECAP is especially attractive because it is easily scaledup for use with large samples 2 Numerous experiments have shown that processing by ECAP produces ultrafinegrain structures in a range of fcc metals including Al and Cu and this led to the development of a model for grain refinement based on the formation of an elongated array of subgrains or cells in the first pass of ECAP the further development of elongated arrays in subsequent passes and the evolution of this structure into an array of equiaxed grains separated by highangle grain boundaries 3 In practice there is excellent agreement between this model of grain refinement for fcc metals 3 the shearing patterns predicted in ECAP processing 4 and
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