Characterization of deformation localization in cold-rolled metastable β-Ti–Nb–Ta–Zr alloy |
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| Authors: | XM Ma W Sun |
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| Affiliation: | 1. Centre for Advanced Materials Processing and Manufacture, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Queensland 4072, Australia;2. State Key Laboratory of Solidification Processing, School of Materials, Northwestern Polytechnical University, Xi''an 710072, China;3. Defence Material Technology Centre, Level 2, 24 Wakefield St, Hawthorn, VIC 3122, Australia;4. School of Science and Engineering, University of the Sunshine Coast, Sippy Downs, Queensland 4575, Australia;1. Department of Materials Science and Engineering, Dow Building, 2300 Hayward St., University of Michigan, Ann Arbor, MI 48109 USA;2. Center for Integrated Nanotechnologies, MPA Division, Los Alamos National Laboratory, Los Alamos, NM 87545 USA |
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| Abstract: | The deformation-induced microstructural variation in the metastable β-type biomedical Ti–35Nb–5Ta–7Zr (wt.%) alloy subjected to multi-pass cold-rolling to 90% reduction has been investigated by a combination of X-ray diffraction, optical microscopy, conventional transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) techniques. Multi-pass cold rolling for the Ti–35Nb–5Ta–7Zr alloy includes various localized deformation processes which can result in dislocation tangle, stress-induced ω-phase transformation and deformation-band formation. Deformation-induced amorphization caused by high-density defect accumulation in deformation bands has been identified. By means of TEM and HRTEM observations, distributional, morphological and structural features for deformation bands have been clearly revealed. |
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