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A body-centred cubic (BCC) structure metal, tantalum, was processed by highpressure torsion (HPT) at room temperature with different numbers of rotations. The microstructural evolution was studied by electron backscatter diffraction (EBSD). The grain sizes were significantly refined at the disk edge area in the early stages of deformation (N = 0.5) but tended to attain saturation after the numbers of rotations was increased to N = 5. As the deformation continued, some coarse grains appeared indoi:10.1088/1757-899x/63/1/012100 fatcat:ittk4bjrivchhftcpdsxslm5ma