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Tuning the Strength and Ductility Balance of a Metastable Titanium Alloy

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Document pages: 13 pages

Abstract: Titanium (Ti) alloys are ubiquitous in the aerospace, defense, and biomedical industries for their high strength to density ratios and good corrosion resistance. Ti alloys are typically optimized for strength, but improved work hardening characteristics and ductility would broaden their use in engineering applications. Here we show desirable combinations of strength and ductility, including a fourfold increase in yield strength, without commensurate losses in ductility, are exhibited, overcoming the strength ductility tradeoff. This is achieved by nanoscale ω phase precipitates produced by natural and artificial aging, in concert with TRansformation Induced Plasticity (TRIP), in alloy Ti-10V-2Fe-3Al (wt. ) for the first time. These deformation mechanisms can be tailored to design microstructures, opening up the mechanical property and performance landscape for lightweight, Ti structural applications, analogous to the design of advanced high strength steels with unique properties for automotive applications that result in energy savings via lightweighting and crashworthiness

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