DEFORMATION BANDING AND ITS INFLUENCE ON DEFORMATION TEXTURES FORMATION

It is shown by a crystallographic etching technique that deformation b anding is an important deformation mode in copper. In a cold rolled co arse grain copper, deformation banding forms in a three dimensional ma nner dividing grains into a large number of bands of different orienta tions. The influence of this important, but long ignored deformation m ode, is studied by incorporating it into the Taylor model. The predict ed textures from the new model are better than those from other existi ng models in mainly two aspects. Firstly, the present model predicts t he co-existence of the three major FCC rolling texture components, nam ely {123}<634> or S component, {112}<111> or C and {110}<112> or B. Th e existing models are deficient in that they predict either C and S or B, but not their co-existence. The second point is that textures pred icted by the existing models are always too sharp compared to the expe rimental textures. The deformation banding model predicts texture peak s with larger spread and hence more realistic texture sharpness.