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Strengthening strategy for a ductile metastable β-titanium alloy using low-temperature aging

Abstract : While ω precipitates in metastable β titanium alloys are typically considered embrittling and consequently deleterious to the mechanical properties, this paper demonstrates that low-temperature aging (LTA) treatments for short time periods can in fact enhance the yield strength while preserving substantial elongation-to-failure in ω containing β titanium alloys. LTA treatments, carried out on a ductile β metastable Ti–12Mo alloy, significantly improve the yield strength of the material (∼55% increase as compared to solution-treated samples) while keeping both TRIP/TWIP effects and a large elongation-to-failure (ϵ = 0.4 in true strain), resulting in a balance of mechanical properties. IMPACT STATEMENT Employing a novel low-temperature annealing strategy, omega precipitates, typically considered embrittling in beta titanium alloys, can effectively increase the yield strength by 50% while preserving 40% tensile ductility.
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Submitted on : Wednesday, June 27, 2018 - 10:12:25 AM
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F. Sun, Jin-Ying Zhang, P. Vermaut, D. Choudhuri, T. Alam, et al.. Strengthening strategy for a ductile metastable β-titanium alloy using low-temperature aging. Materials Research Letters, Taylor & Francis, 2017, 5 (8), pp.547-553. ⟨10.1080/21663831.2017.1350211⟩. ⟨hal-01639686⟩



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