低层错能CrCoNi基(中)高熵合金的强化方法研究OA

CrCoNi-based medium-or high-entropy alloys with low stacking fault energy have excellent fracture toughness at room temperature or low temperature.Moreover,under impact conditions,the variety of deformation mechanisms imparts excellent deformation ability to CrCoNi-based medium-or high-entropy alloys,which can be used as impact-resistant structural materials in extreme environments.However,the dilemma of"strength-plasticity"in metallic materials is still observed in CrCoNi-based medium-or high-entropy alloys,and the low yield strength limits the potential application of CrCoNi-based medium-or high-entropy alloys.Therefore,selecting appropriate strengthening methods to improve the yield strength of CrCoNi-based medium-or high-entropy alloys while maintaining their high plasticity has become a hotspot in the research of high-entropy alloys at present.This article introduced the strengthening methods currently applied in CrCoNi-based medium-or high-entropy alloys from three aspects:solid element,lattice defects,and phase structure.Various strengthening and toughening mechanisms,such as solid solution elements,interstitial atoms,dislocations,twinning,phase transformations,and gradient structures,were reviewed.By learning from the deformation mechanisms of CrCoNi-based medium-or high-entropy alloys,the different strengthening mechanisms and their impact on the increase in mechanical properties were analysed,providing ideas for the design of high-strength and high-toughness alloys with low stacking fault energy.