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Strength-ductility synergy in nanotwinned Si-containing CrCoNi-based medium-entropy alloys by thermomechanical treatments
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DOI：10.1016/j.vacuum.2026.115576.png)
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Abstract
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Nanotwinned Si-containing CrCoNi-based medium-entropy alloys (MEAs) achieved remarkable strength-ductility synergy through strategic Si addition and optimized thermomechanical treatment, overcoming the conventional strength-ductility trade-off. Our study systematically investigated the evolution of the microstructures and mechanical properties of CrCoNi-based MEAs following various deformation and annealing processes to optimize nanotwinning. Si addition significantly enhanced the twinning kinetics by reducing the stacking fault energy, while maintaining the single-phase austenite during deformation, increasing the tensile strength by 19% to 819 MPa without ductility loss. Single-step deformation and annealing delivered a better strength-ductility synergy than cyclic treatments, showing a finer nanotwin spacing. Consequently, compared to the nanotwinned CrCoNi MEA, the optimized nanotwinned CrCoNiSi MEA achieved a 19.6% increase in tensile strength, reaching 1018 MPa, and a 14.4% improvement in elongation, attaining 31.7%, demonstrating an exceptional combination of strength and ductility.
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