Bulk ultrafine-grained(UFG) CoCrFeMnNi high-entropy alloy(HEA) with fully recrystallized microstructure was processed by cold rolling and annealing treatment. The high-cycle fatigue behaviors of the UFG HEA and a coar...Bulk ultrafine-grained(UFG) CoCrFeMnNi high-entropy alloy(HEA) with fully recrystallized microstructure was processed by cold rolling and annealing treatment. The high-cycle fatigue behaviors of the UFG HEA and a coarse-grained(CG) counterpart were investigated under fully reversed cyclic deformation.The fatigue strength of the UFG HEA can be significantly enhanced by refining the grain size. However,no grain coarsening was observed in the UFG HEA during fatigue tests. Mechanisms for the superior mechanical properties of the UFG HEA were explored.展开更多
Nano structured Cu-/Al-laminated composites were processed by accumulative roll-bonding(ARB)technique for four cycles.Microstructural evolutions inside the Cu and Al layers and the interfacial reactions were revealed ...Nano structured Cu-/Al-laminated composites were processed by accumulative roll-bonding(ARB)technique for four cycles.Microstructural evolutions inside the Cu and Al layers and the interfacial reactions were revealed after annealing at different temperatures.Recovery and recrystallization occurred in the Cu and Al layers at low annealing temperatures,and three kinds of intermetallic compounds formed near the interfaces.The mechanical properties of these composites after annealing were investigated by tensile tests,and the variation of strength-ductility synergy was comprehensively discussed by considering the roles of constituent and the intermetallic compounds.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 51501198 and 51331007)
文摘Bulk ultrafine-grained(UFG) CoCrFeMnNi high-entropy alloy(HEA) with fully recrystallized microstructure was processed by cold rolling and annealing treatment. The high-cycle fatigue behaviors of the UFG HEA and a coarse-grained(CG) counterpart were investigated under fully reversed cyclic deformation.The fatigue strength of the UFG HEA can be significantly enhanced by refining the grain size. However,no grain coarsening was observed in the UFG HEA during fatigue tests. Mechanisms for the superior mechanical properties of the UFG HEA were explored.
基金financially supported by the Fundamental Research Funds for the Central Universities under grant No.N180204015the National Natural Science Foundation of China(NSFC)under Grant No.51331007。
文摘Nano structured Cu-/Al-laminated composites were processed by accumulative roll-bonding(ARB)technique for four cycles.Microstructural evolutions inside the Cu and Al layers and the interfacial reactions were revealed after annealing at different temperatures.Recovery and recrystallization occurred in the Cu and Al layers at low annealing temperatures,and three kinds of intermetallic compounds formed near the interfaces.The mechanical properties of these composites after annealing were investigated by tensile tests,and the variation of strength-ductility synergy was comprehensively discussed by considering the roles of constituent and the intermetallic compounds.
