Effect of grain orientation on microstructures during hot deformation of AA 3104 aluminium alloy by plane strain compression

AA 3104 aluminium alloy was deformed at a temperature of 510 degreesC and a t a strain rate of 5 s(-1) to strains of 0.14, 0.53, 1.52, and 2.49 by plan e strain compression. The effect of grain orientation on microstructures ha s been investigated using transmission electron microscopy (TEM). The resul ts show that the grain orientation has a strong effect on the microstructur es at low strains. The microstructures can be classified into three types a ccording to the process of grain subdivision and the characteristics of dis location boundaries. Every type of microstructure is concentrated in a posi tive district in orientation distribution figure. The microstructures in gr ains near the brass and S orientations correspond to the Type A(I) microstr ucture. The grains near the copper orientation appear as a Type A(II) micro structure. The Type B microstructure is found in the region near the rotate d Goss orientation. The Type C microstructure is concentrated in the cube o rientation. At large strains approximately equiaxed subgrains are observed. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All right s reserved.