Study on Ta-2.5W alloy sheet texture evolution and r value anisotropy under different rolling reduction ratio

Two Ta-2.5W alloy sheets were cold-rolled to 1 mm and 0.5 mm thick and their plastic strain ratio (r values) were evaluated by tensile tests. The 0.5 mm sheet, comparing with the 1 mm sheet, showed a stronger variation of the r value. This is because that the {0 0 1}〈1 1 0〉 texture, as revealed by the EBSD, significantly increased in the 0.5 mm sheet, which led to the decrease of r value and the increase of anisotropy (Δr) and in turn the deterioration of deep drawing properties. An analytical model was established to correlate the microstructure evolution and the macroscopic r value.