Effect of equal channel angular pressing on grain refinement and texture evolution in a biomedical alloy Ti13Nb13Zr |
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Affiliation: | 1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India;2. Laboratory of Bulk Nanomaterials, Belgorod State University, Belgorod 308015, Russia;1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India;2. Materials Science and Engineering, Indian Institute of Technology Gandhinagar, Gujarat 382355, India;3. Bruker Nano Surfaces, Minneapolis, MN 55344, USA;4. Department of Metallurgical & Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036, India |
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Abstract: | Evolution of texture and concomitant grain refinement during Equal Channel Angular Pressing (ECAP) of Ti 13Nb 13Zr alloy has been presented. Sub-micron sized equiaxed grains with narrow grain size distribution could be achieved after eight pass at 873 K. A characteristic ECAP texture evolved in α phase till four passes while the evolution of characteristic ECAP texture in the β phase could be observed only beyond the fourth pass. On increasing the deformation up to eight passes, the texture in α phase weakens while the β phase shows an ideal ECAP texture. A weaker texture, low dislocation density and high crystallite size values in α phase suggest the occurrence of dynamic recrystallization. The absence of texture evolution in β phase till four passes can be attributed to local lattice rotations. The characteristic ECAP texture in the eight pass deformed sample is attributed to delayed dynamic recrystallization in the β phase. |
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