Oxygen-mediated high uniform plasticity in α-β titanium alloys

Yahui Yang, Xiuxia Wang, Biao Chen, Shenglu Lu, Kaiyue Liu, Shota Kariya, Xianzhe Shi, Xiaozhou Liao, Katsuyoshi Kondoh, Ma Qian () and Jianghua Shen ()
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Yahui Yang: Northwestern Polytechnical University, School of Aeronautics
Xiuxia Wang: Northwestern Polytechnical University, School of Aeronautics
Biao Chen: Northwestern Polytechnical University, State Key Laboratory of Solidification Processing
Shenglu Lu: Melbourne, Centre for Additive Manufacturing, School of Engineering, RMIT University
Kaiyue Liu: Northwestern Polytechnical University, State Key Laboratory of Solidification Processing
Shota Kariya: The University of Osaka, Joining and Welding Research Institute
Xianzhe Shi: Northwestern Polytechnical University, School of Aeronautics
Xiaozhou Liao: The University of Sydney, School of Aerospace, Mechanical and Mechatronic Engineering
Katsuyoshi Kondoh: The University of Osaka, Joining and Welding Research Institute
Ma Qian: Melbourne, Centre for Additive Manufacturing, School of Engineering, RMIT University
Jianghua Shen: Northwestern Polytechnical University, School of Aeronautics

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract Titanium alloys are critically important materials, yet their development has long been constrained by a fundamental trade-off between yield strength and uniform elongation—a more challenging limitation than the conventional strength–ductility trade-off. Here, we present a dual strategy for α–β titanium alloys that transforms high oxygen from an embrittling liability into a powerful performance enabler. First, we leverage high oxygen ( ≥0.40%) to activate prominent pyramidal slip in the α-phase. Second, we engineer a tailored α–β microstructure through alloy design (Ti–O–Fe), laser-based powder bed fusion, and annealing to enable sustained slip transfer across α–β interfaces. The resulting high-strength α–β alloys achieve record uniform elongations: Ti-0.45O-4Fe delivers ≥14% (total: ≥27%) at yield strengths ≥980 MPa, and Ti-0.5O-5Fe achieves ≥13% (total: ≥23%) at yield strengths ≥1075 MPa. This work simultaneously addresses the yield strength–uniform elongation trade-off and oxygen embrittlement, demonstrating a design paradigm for α–β titanium alloys.

Date: 2025
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DOI: 10.1038/s41467-025-65851-4

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