A novel microstructural approach for TRIP/TWIP β-Ti alloys using intermetallic precipitation

Ellyson, Benjamin; Rietema, Connor J.; Peterson, Nathan E.; Rani, Valava Sambandan; Park, Jun-Sang; Almer, Jon; Clarke, Kester D.; Clarke, Amy J.

doi:10.1016/j.msea.2025.149385

A novel microstructural approach for TRIP/TWIP β-Ti alloys using intermetallic precipitation

Journal Article · Mon Nov 03 00:00:00 EST 2025 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2025.149385· OSTI ID:3012476

^[1]; ^[1]; ^[2]; ^[3]; ^[4]; Almer, Jon ^[4]; Clarke, Kester D. ^[2]; Clarke, Amy J. ^[2]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Colorado School of Mines, Golden, CO (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Colorado School of Mines, Golden, CO (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: 89233218CNA000001; AC02-06CH11357; AC52-07NA27344

OSTI ID:: 3012476

Report Number(s):: LLNL--JRNL-2006886

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Vol. 949; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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