Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 410, Issue -, Pages 381-385Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2005.08.026
Keywords
ECAE; severe deformation; grain refinement; particles; dispersiods; processing route
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The effect of coarse and fine second-phase particles on the formation of ultra-fine grained (UFG) structures have been compared during severe deformation by equal-channel angular extrusion using routes A (no rotation) and B-C (+90 degrees rotation). The presence of coarse particles has been found to increase the rate of grain refinement with route A and the homogeneity of the submicron grain structure formed, but appears less effective using route B-C. In contrast, the presence of fine dispersoids inhibits the development of new high-angle grain boundaries and the formation of an UFG structure with both routes. Retardation is far more pronounced with rotation of the sample and the dispersiod-containing alloy processed by route B-C contained mainly subgrains. The mechanisms operating in each case are discussed. (c) 2005 Elsevier B.V. All rights reserved.
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