Texture evolution during deformation of an AL-6% Cu-0,4% Zr superplastic alloy

Evolution of the grain structure and microstructure was studied at 480 degree centigrade C/5.10''-4 s''-1 on an Al-6% Cu-0.4% Zr superplastic alloy. the as-received material showed a fine deformed substructure. A texture gradient was present through the thickness of the rolled sheet. At the surface, the texture found was close to the orientation (311) <233> whereas in the midplane of the sheet it was (631)<113>. The (σ)-(ε) tensile test curve presented three deformation stages called, stage I, II and III. The global texture in stage I increased slightly. In stage II, the intensity of the orientation (311)<233> decreased, suggesting that a grain boundary sliding process should take near the surface. However, in the center of the sheet it is approached that the (63)<113> component changes along the β-fiber inducing a clustering around the (110)<112> (B) and//or (110)<111> orientations by slip process. In the stage III the intensify of orientations decreases. (Author) 12 refs