Effect of Ta content on stacking fault energy and microstructure characteristics of (VCoNi)100-XTaX (X=0, 0.05, 0.5 and 1) medium entropy alloy

Ultra-strong medium entropy alloy (VCoNi) is designed via severe lattice distortion. Simulation calculation suggests the stacking fault energy of VCoNi can be reduced as increasing Ta contents, but keep the deformation twinnability almost unchanged. The experiment result suggests Ta addition can't remarkably increase the deformation twinning propensity due to the chemical short-range order in VCoNi.

Automated summary

Ultra-strong medium entropy alloy VCoNi is designed through severe lattice distortion. Simulation results show that increasing Ta content can reduce the stacking fault energy of VCoNi, while keeping deformation twinnability almost unchanged. Experimental data indicates that the addition of Ta does not significantly increase the propensity for deformation twinning due to the chemical short-range order in VCoNi.