Effect of strain rate on the deformation mechanism of laser powder bed fusion (LPBF) Ti – 10V-2Fe-3Al alloy before and after solution treatment

This work investigated the differences in the deformation mechanism of Ti-1023 before and after solution treatment via LPBF, and the effect of the strain rate on its mechanical properties. The as-fabricated microstructure consists of (β+isothermal ω) phases, while the β-solutionized samples have (β+ω) phases.

When the strain rate increased from 2×10-4s-1 to 4×103s-1, the compressive strength of the as-fabricated increased by 24%, the fracture strain increased by 150%. In contrast, the β-solutionized samples show a 5.8% decrease in compressive strength and a 40% reduction in fracture strain. The deformation mechanism of the as-fabricated samples is dominated by dislocation slip, while the β-solutionized samples primarily undergo stress-induced martensitic transformation (SIMT), driven by changes in [Mo]eq.