CrCoNi基中熵合金的强韧性协同机制OA

CrCoNi-based medium-entropy alloys have garnered substantial research attention as high-performance metallic materials,owing to their exceptional synergy between strength and toughness.This review provides a systematic overview of the core strengthening-toughening mechanisms and pivotal performance-regulation strategies.At the atomic scale,chemical short-range order(CSRO)promotes the formation of locally ordered clusters,which impede dislocation motion.Moreover,the dynamic evolution of CSRO interacts with stacking fault energy,facilitating the generation of stacking faults and deformation twins.On the nanoscale,a three-dimensional twin network not only restricts dislocation glide but also provides channels for slip.Additionally,the introduction of nanoscale precipitates modifies the dominant deformation mechanism,enabling the simultaneous enhancement of strength and ductility.Further research reveals that precise control over heat treatment,additive manufacturing,and plastic deformation processes can effectively tailor strengthening phases and gradient structures,thereby improving mechanical properties.The alloy demonstrates a distinct advantage at cryogenic temperatures,where multiple deformation mechanisms are activated,resulting in the concurrent enhancement of strength and toughness.Future research endeavors should concentrate on elucidating the dominant mechanisms at room temperature and enhancing environmental adaptability to facilitate engineering applications.