Shear Bands in Rolled Copper Single Crystals

抄録

The development of shear bands has been investigated metallographically on (211)[\bar111] copper single crystals rolled at room and liquid nitrogen temperature (RT and LNT), respectively. The shear bands at the LNT rolling appear in the lamellae of mechanical twins, while those at the RT rolling occur in the slip deformed crystal. Although these two types of shear bands show great differences from each other in nucleation sites, development behavior and microstructures, these differences will be attributed to whether mechanical twinning occurs or not in the crystals during rolling. It will be inferred that the shear bands can be formed in the (211)[\bar111] crystal accompanied by localized deformation, which may be brought about by straining the mechanical twin lamellae at LNT and by unequal activation of multiple slip systems at RT.