Beneficial clock-rolling cycles on the microstructure uniformity of {111} grains in tantalum sheets

• Published in: Progress in natural science Vol. 30; no. 1; pp. 124 - 127
• Main Authors: Zhu, Jialin, Liu, Shifeng, Yang, Shuai, Liu, Yahui, Chapuis, Adrien
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2020; College of Materials Science and Engineering,Chongqing University,Chongqing,400044,China
• Subjects: Clock rolling cycle; Recrystallization kinetics; Stored energy; Taylor model; Texture; Recrystallization kinetics; Clock rolling cycle; Taylor model; Texture; Stored energy
• ISSN: 1002-0071
• DOI: 10.1016/j.pnsc.2020.01.005

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 { //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. [Display omitted] •Two sheets were produced by 135° clock rolling to same reduction in 1 or 2 cycles.•Different deformation substructures existed in the {111} grains in the two samples.•The recrystallization rate in the {111} grains in the 1-cycle sheet was much faster.•Taylor model was adopted to clarify the difference in deformation behavior.