Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

Yoji Furukawa; Toshiyuki Fujii; Susumu Onaka; Masaharu Kato

doi:10.2320/matertrans.MD200806

This article has now been updated. Please use the final version.

Cyclic Deformation Behavior of Ultra-Fine Grained Copper Produced by Equal Channel Angular Pressing

Yoji Furukawa, Toshiyuki Fujii, Susumu Onaka, Masaharu Kato

Author information

Keywords: ultra-fine grained copper, equal channel angular pressing, cyclic deformation, cyclic softening, shear bands, grain coarsening

JOURNAL RESTRICTED ACCESS Advance online publication

Article ID: MD200806

DOI https://doi.org/10.2320/matertrans.MD200806

The final version of this article is now available: Vol. 50 (2009) , No. 1 p.70

Details

Abstract

Cyclic deformation behavior of ultra-fine grained (UFG) Cu of 99.99% purity processed by equal-channel angular pressing was investigated. In tension-compression fatigue tests under strain control, UFG Cu showed cyclic softening. Shear bands were formed along the direction inclined by about 45° from the loading axis. Observations using an electron backscattering diffraction technique and transmission electron microscopy revealed that local grain growth took place in the shear bands and overall grains elongated along the shear direction. Cyclic softening can be understood as a result of dynamic grain coarsening occurred intensively in the strain localized shear bands.

Corresponding author

Register with J-STAGE for free!