The dynamic response of a metastable β Ti–Nb alloy to high strain rates at room and elevated temperatures

Hongyi Zhan; Gui Wang; Damon Kent; Matthew Dargusch

doi:10.1016/j.actamat.2015.11.056

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The dynamic response of a metastable β Ti–Nb alloy to high strain rates at room and elevated temperatures

Journal article

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The dynamic response of a metastable β Ti–Nb alloy to high strain rates at room and elevated temperatures

Hongyi Zhan, Gui Wang, Damon Kent and Matthew Dargusch

Acta Materialia, Vol.105, pp.104-113

2016

DOI: https://doi.org/10.1016/j.actamat.2015.11.056

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Abstract

metastable β titanium alloys

high strain rates

mechanical twinning

strain hardening behaviour

A metastable β Ti-Nb alloy, Ti-25Nb-3Zr-3Mo-2Sn (wt.%), has been subjected to high strain rate deformations (1000 s-1) at the temperatures of 293 K, 573 K and 873 K by Split Hopkinson Pressure Bar compressive tests. The microstructural evolution and deformation mechanisms of the metastable Ti-Nb-Zr-Mo-Sn alloy have been investigated by X-ray diffraction, electron backscatter diffraction and transmission electron microscopy. Multiple deformation mechanisms including {332} <113> and {112} <111> mechanical twinning, stress-induced α" and ω phase transformations and dislocation slip were identified at 293 K. Among them, {332} <113 > twinning is the dominant deformation mechanism and induced pronounced strain hardening at 293 K. At 573 K, {332} <113> and {112} <111 > mechanical twinning occur in conjunction with dislocation slip. Though the direct contribution to strengthening by mechanical twinning is relatively small at 573 K, it enhances both the multiplication and annihilation of dislocations thereby impacting the strain hardening behaviour of the Ti-Nb-Zr-Mo-Sn alloy. With an increase in temperature to 873 K, the plastic strain is accommodated by dislocation slip only. The deformation mechanisms which are active during deformations at different temperatures also influence the development of texture in the Ti-Nb-Zr-Mo-Sn alloy.

Details

Title: The dynamic response of a metastable β Ti–Nb alloy to high strain rates at room and elevated temperatures
Authors: Hongyi Zhan (Author) - University of Queensland
Gui Wang (Author) - University of Queensland
Damon Kent (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Matthew Dargusch (Author) - University of Queensland
Publication details: Acta Materialia, Vol.105, pp.104-113
Publisher: Pergamon
Date published: 2016
DOI: 10.1016/j.actamat.2015.11.056
ISSN: 1359-6454
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99449928402621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering