銅単結晶の圧延における{211}⟨\bar111⟩方位の挙動について

Abstract

In order to clarify the strain rate dependence of the stability of the {211}〈\bar111〉 orientation which is a second component of pure metal type rolling textures in fcc metals, the copper single crystals with the initial orientation (211)[\bar111] were rolled at room temperature at the rolling rates of 0.1 m/min and 100 m/min, which correspond to the strain rates of 10−1/sec and 102/sec respectively. The orientation changes during rolling were determined by the reflection electron diffraction method and the deformation substructures were observed by the transmission electron microscope. The results obtained are summarized as follows,(1) The stability of the (211)[\bar111] orientation during rolling depended on the strain rate.(2) At the low strain rate (10−1/sec), the initial (211)[\bar111] orientation was maintained until over 98% reduction.(3) At the high strain rate (102/sec), there were two different cases. First, the deviation from initial orientation to (513)[\bar121] was observed at about 30∼50% reduction. Secondly, the initial orientation was retained accompanying twinning deformation, and the (211)[\bar111]+(011)[100] orientations were developed at about 98% reduction.It may be concluded that these results are closely connected with the dynamical recovery due to the cross slip of screw dislocations and with the dynamic effects of the strain rate during rolling deformation.