Authors: ZongShen Wang YanJin Guan Ping Liang
Publish Date: 2013/12/31
Volume: 33, Issue: 3, Pages: 287-292
Abstract
Constrained groove pressing CGP is a new severe plastic deformation method suitable for producing ultrafine grained sheet metals In this work the processing efficiency for a mutipass CGP of pure copper was investigated With a relatively small groove width of 2 mm and tight constraint a sharp variation of mechanical properties with pass number is observed Subgrains with the size of ~05 μm have distinct boundaries which is the predominant feature in the microstructure after three passes The evolution of deformation homogeneity characterized by microhardness distribution was examined in detail Observations of optical micrographs and fracture surface morphology confirm the evolution rule The relation between electrical resistivity and accumulative plastic strain was discussed Crystalline defects microcracks and microstructure uniformity together determine the change of electrical resistivity of CGP copperThis work was financially supported by the National Natural Science Foundation of China No51375269 Program for New Century Excellent Talents in University NoNCET080337 and Graduate Independent Innovation Foundation of Shandong University No yzc12122
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