DOE OSTI · 3012476
A novel microstructural approach for TRIP/TWIP β-Ti alloys using intermetallic precipitation
Abstract
Interest in metastable β-Ti has grown, due to the exceptional work hardening caused by TRansformation and TWinning Induced Plasticity (TRIP/TWIP). A current challenge is increasing the yield strength, while maintaining the benefits of TRIP/TWIP. This study presents the first report of TRIP/TWIP in a metastable β-Ti alloy containing intermetallic compounds, specifically Ti silicide precipitates. Silicon (Si) additions enable the formation of silicide particles, which can be precipitated, dissolved, and controlled through tailored heat treatments. In-situ synchrotron x-ray diffraction during tensile testing reveals primary {332}<113> twinning activates first, followed by TRIP, leading to extensive work hardening and uniform elongation in the solutionized state. In conclusion, these findings open a novel microstructural approach to the design of multiphase TRIP/TWIP titanium alloys, relying on intermetallic precipitation rather than allotropes such as α or ω phase, and lay the groundwork for future studies on intermetallic precipitation strengthening.
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Ellyson, Benjamin [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Colorado School of Mines, Golden, CO (United States)] (ORCID:000000023112014X), Rietema, Connor J. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Colorado School of Mines, Golden, CO (United States)] (ORCID:0000000289328672), Peterson, Nathan E. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Colorado School of Mines, Golden, CO (United States)] (ORCID:0000000170443542), Rani, Valava Sambandan [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0009000477263666), Park, Jun-Sang [Argonne National Laboratory (ANL), Argonne, IL (United States)] (ORCID:0000000234168130), Almer, Jon [Argonne National Laboratory (ANL), Argonne, IL (United States)], Clarke, Kester D. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Colorado School of Mines, Golden, CO (United States)], Clarke, Amy J. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Colorado School of Mines, Golden, CO (United States)]. 2025-11-03. A novel microstructural approach for TRIP/TWIP β-Ti alloys using intermetallic precipitation. https://doi.org/10.1016/j.msea.2025.149385
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