Alloy design by tailoring phase stability in commercial Ti alloys

Zhao, G.-H. and Liang, X.Z. and Xu, X. and Gamża, M.B. and Mao, H. and Louzguine-Luzgin, D.V. and Rivera-Díaz-del-Castillo, P.E.J. (2021) Alloy design by tailoring phase stability in commercial Ti alloys. Materials Science and Engineering: A, 815. ISSN 0921-5093

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The mechanical characteristics and the operative deformation mechanisms of a metallic alloy can be optimised by explicitly controlling phase stability. Here an integrated thermoelastic and pseudoelastic model is presented to evaluate the β stability in Ti alloys. The energy landscape of β→α′/α″ martensitic transformation was expressed in terms of the dilatational and transformational strain energy, the Gibbs free energy change, the external mechanical work as well as the internal frictional resistance. To test the model, new alloys were developed by tailoring two base alloys, Ti–6Al–4V and Ti–6Al–7Nb, with the addition of β-stabilising element Mo. The alloys exhibited versatile mechanical behaviours with enhanced plasticity. Martensitic nucleation and growth was fundamentally dominated by the competition between elastic strain energy and chemical driving force, where the latter term tends to lower the transformational energy barrier. The model incorporates thermodynamics and micromechanics to quantitatively investigate the threshold energy for operating transformation-induced plasticity and further guides alloy design. © 2021 The Author(s)

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Journal Article
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Materials Science and Engineering: A
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25 May 2021 15:50
Last Modified:
29 Apr 2022 15:53