Investigation of early stage deformation mechanisms in a metastable β titanium alloy showing combined twinning-induced plasticity and transformation-induced plasticity effects |
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Authors: | F Sun JY Zhang M Marteleur T Gloriant P Vermaut D Laillé P Castany C Curfs PJ Jacques F Prima |
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Affiliation: | 1. Laboratoire de Physico-Chimie des Surfaces, Groupe de Métallurgie Structurale (UMR 7045), Chimie-ParisTech, Paris, France;2. Université Catholique de Louvain, Institute of Mechanics, Materials and Civil Engineering, IMAP, Place Sainte Barbe 2, B-1348 Louvain-la-Neuve, Belgium;3. Institut des Sciences Chimiques de Rennes, UMR CNRS 6226, INSA de Rennes, 20 Avenue des Buttes de Coësmes, F-35043 Rennes Cedex, France;4. European Synchrotron Radiation Facility (ESRF), Grenoble, France |
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Abstract: | As expected from the alloy design procedure, combined twinning-induced plasticity and transformation-induced plasticity effects are activated in a metastable β Ti–12 wt.% Mo alloy. In situ synchrotron X-ray diffraction, electron backscatter diffraction and transmission electron microscopy observations were carried out to investigate the deformation mechanisms and microstructure evolution sequence. In the early deformation stage, primary strain/stress-induced phase transformations (β → ω and β → α″) and primary mechanical twinning ({3 3 2}〈1 1 3〉 and {1 1 2}〈1 1 1〉) are activated simultaneously. Secondary martensitic phase transformation and secondary mechanical twinning are then triggered in the twinned β zones. The {3 3 2}〈1 1 3〉 twinning and the subsequent secondary mechanisms dominate the early-stage deformation process. The evolution of the deformation microstructure results in a high strain-hardening rate (~2 GPa), bringing about high tensile strength (~1 GPa) and large uniform elongation (>0.38). |
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Keywords: | In situ synchrotron XRD Titanium alloy Deformation twinning Martensitic phase transformation Deformation mechanism |
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