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Understanding the deformation mechanism of HCP-FCC dual-phase titanium-oxygen alloys
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DOI：10.1016/j.scriptamat.2026.117388.png)
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Abstract
En 中文
Recent studies have demonstrated that the formation of the FCC (γ) phase in titanium (Ti) alloys remarkably enhances their mechanical properties. However, the intrinsic deformation mechanism in multiphases including the γ phase has remained insufficiently understood. This study reveals that the deformation of the γ phase in the as-printed α-γ dual-phase Ti-0.67O alloy is dominated by synergetic mechanisms: dislocation slip, stacking faults, and twinning. Especially, the γ phase yielded prior to the α phase during deformation. In addition, the stress concentration at the α/γ interface activates the plastic deformation of the nearby α phase at the subsequent deformation stage. This cooperative deformation behavior, associated with the ‘soft’ γ phase and the ‘hard’ α phase, contributes to excellent mechanical properties of the Ti-0.67O alloy. This study provides in-depth insights into the deformation mechanism of the α-γ dual-phase Ti-O alloys, and potentially opens avenues for the performance optimization of Ti alloys.
Keywords:
FCC phase
deformation mechanism
titanium alloy
dual-phase
stacking faults
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5.6
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1.6W
Citations:
5.1W
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