The strength-ductility trade-offhas been a longstanding dilemma in metallic materials.Here we report an innovative approach to achieve a high strength-ductility synergy via dual precipitation of sheared and bypassed p...The strength-ductility trade-offhas been a longstanding dilemma in metallic materials.Here we report an innovative approach to achieve a high strength-ductility synergy via dual precipitation of sheared and bypassed precipitates.(Ni_(2) Co_(2) FeCr)_(96-x) Al_(4) Nb_(x)(at.%)alloys strengthened by nanoscale L12 particles and Laves precipitates were selected as a model for this study,and their precipitate microstructures and mechanical properties were thoroughly investigated.The dual-precipitation-strengthened alloys exhibit a yield strength of more than 1400 MPa,an ultimate tensile strength of over 1800 MPa,and a uniform elon-gation of 18%,thus achieving a high strength-ductility synergy.Our analysis reveals that the nanoscale L1_(2) precipitates contribute to the strength via the particle shearing mechanism,whereas the Laves phase provides the strengthening through the Orowan bypass mechanism.The study of deformation microstruc-tures shows that the L1_(2) precipitates are sheared by stacking faults,which facilitates long-range disloca-tion gliding through the matrix.As a result,deformation induces the formation of hierarchical stacking fault networks and immobile Lomer-Cottrell locks,which effectively enhance the work hardening ca-pability and plastic stability,thereby resulting in a high ductility at high strength levels.Dislocations are piled-up against the interface between the Laves precipitates and matrix,which increases the work hardening capability at the early stages of plastic deformation but causes stress concentrations.The dual precipitation strategy may be useful for many other alloys for achieving superior mechanical properties for technological applications.展开更多
基金This research was supported by the National Natural Science Foundation of China(Grant Nos.52171162 and 51801169)Research Grants Council of Hong Kong(Nos.ECS 25202719,GRF 15227121,C1017-21GF,and C1020-21GF)+3 种基金State Key Laboratory for Advanced Metals and Materials Open Fund(2021-ZD04)Shenzhen Science and Technology Program(Grant No.JCYJ20210324142203009)Re-search Institute for Advanced Manufacturing Fund(No.P0041364 and P0046108)PolyU Fund(Nos.P0038814,P0039624,P0042933,and P0043467).
文摘The strength-ductility trade-offhas been a longstanding dilemma in metallic materials.Here we report an innovative approach to achieve a high strength-ductility synergy via dual precipitation of sheared and bypassed precipitates.(Ni_(2) Co_(2) FeCr)_(96-x) Al_(4) Nb_(x)(at.%)alloys strengthened by nanoscale L12 particles and Laves precipitates were selected as a model for this study,and their precipitate microstructures and mechanical properties were thoroughly investigated.The dual-precipitation-strengthened alloys exhibit a yield strength of more than 1400 MPa,an ultimate tensile strength of over 1800 MPa,and a uniform elon-gation of 18%,thus achieving a high strength-ductility synergy.Our analysis reveals that the nanoscale L1_(2) precipitates contribute to the strength via the particle shearing mechanism,whereas the Laves phase provides the strengthening through the Orowan bypass mechanism.The study of deformation microstruc-tures shows that the L1_(2) precipitates are sheared by stacking faults,which facilitates long-range disloca-tion gliding through the matrix.As a result,deformation induces the formation of hierarchical stacking fault networks and immobile Lomer-Cottrell locks,which effectively enhance the work hardening ca-pability and plastic stability,thereby resulting in a high ductility at high strength levels.Dislocations are piled-up against the interface between the Laves precipitates and matrix,which increases the work hardening capability at the early stages of plastic deformation but causes stress concentrations.The dual precipitation strategy may be useful for many other alloys for achieving superior mechanical properties for technological applications.