Controlling the texture of tantalum sheets is of critical importance to fabricate good sputtering targets.In the present study two tantalum sheets were produced by clock rolling to 70% thickness reduction in 1 or 2 cycles.The results show that the stored energy and grain subdivision within the {111} grains {<111>//normal direction(ND)} after 1 cycle are significantly higher than those after 2 cycles,leading to fast recrystallization kinetics and strong {111} recrystallized texture upon annealing.Simulations with Taylor model indicate that shear strain occurred on more slip systems in the 2-cycle sample,which could explain the formation of cell blocks in {111} grains.
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