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Medium-entropy alloys (MEAs), known for their outstanding strength and ductility, offer great potential for high strain-rate applications. This study focuses on a NiCoV-based MEA system, where a novel alloy design strategy was proposed by introducing 5 at.% high-melting-point tungsten through vacuum arc melting coupled with thermomechanical processing to fabricate the (NiCoV)95 W5 alloy. Split Hopkinson pressure bar (SHPB) experiments were conducted to elucidate the dynamic response mechanisms and deformation behavior under high strain rates (2000-6000 s-1). The results show that the enhanced phonon drag effect at elevated strain rates, caused by severe lattice distortion, leads to a substantial increase of 162% in yield strength from 720 MPa (10-3 s-1) to 1887 MPa (6000 s-1), accompanying with a relatively high strain-rate sensitivity (m = 0.42); Microscopic analysis revealed the multi-scale cooperative deformation mechanism of the alloy system under high strain rate. When the strain rate is 2000 s-1, the alloy exhibits a low dislocation density dominated by dislocation planar slip. As the strain rate rises to 4000 s-1, elevated flow stress and deformation promote substantial dislocation multiplication and entanglement into high-density dislocation cells. Dislocation pile-up stress induces co-deformation of precipitates and releases stress concentration at the phase interface. Upon further increasing the strain rate to 6000 s-1, severe plastic deformation induces nano-twin formation within the matrix, as prevailing strain hardening. This study illustrates the tungsten-doping mediated dynamic response mechanisms in MEAs, providing a guidance for designing novel structural materials with excellent dynamic mechanical responses.
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Keywords:
- Medium-entropy alloy /
- Dynamic compression deformation /
- Work hardening /
- Precipitation strengthening
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