首页|An additively manufactured precipitation hardening medium entropy alloy with excellent strength-ductility synergy over a wide temperature range

An additively manufactured precipitation hardening medium entropy alloy with excellent strength-ductility synergy over a wide temperature range

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Modern engineering has long been in demand for high-performance additive manufactured materials for harsh working conditions.The idea of high entropy alloy(HEA),medium entropy alloy(MEA),and multi-principal-element alloy(MPEA)provides a new way for alloy design.In this work,we develop a Co42Cr20Ni30Ti4Al4 quinary MEA which exhibits a superiority of mechanical properties over a wide tem-perature ranging from 77 to 873 K via selective laser melting(SLM)and post-heat treatment.The present MEA achieves an excellent ultimate tensile strength(UTS)of 1586 MPa with a total elongation(TE)of 22.7％at 298 K,a UTS of 1944 MPa with a TE of 22.6％at 77 K,and a UTS of 1147 MPa with a TE of 9.1％at 873 K.The excellent mechanical properties stem from the microstructures composed of partially refined grains and heterogeneously precipitated L12 phase due to the concurrence of recrystallization and precipitation.The grain boundary hardening,precipitation hardening,and dislocation hardening con-tribute to the high YS at 298 and 77 K.Interactions of nano-spaced stacking faults(SFs)including SFs networks,Lomer-Cottrell locks(L-C locks),and anti-phase boundaries(APBs)induced by the shearing of L1 2 phase are responsible for the high strain hardening rate and plasticity at 77 K.Our work provides a new insight for the incorporation of precipitation hardening and additive manufacturing technology,paving the avenue for the development of high-performance structural materials.

Additive manufacturingSelective laser meltingMedium entropy alloyMulti-principal-element alloyPrecipitation hardeningMechanical properties

Jing Huang、Wanpeng Li、Tao Yang、Tzu-Hsiu Chou、Rui Zhou、Bin Liu、Jacob C.Huang、Yong Liu

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State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

Department of Materials Science and Engineering,City University of Hong Kong,Kowloon 999077,Hong Kong SAR,China

TRACE EM Unit,City University of Hong Kong,Kowloon 999077,Hong Kong SAR,China

Department of Materials and Optoelectronic Science,National Sun Yat-Sen University,Kaohsiung 804,Taiwan,China

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National Natural Science Foundation of China

52020105013

2024

10.1016/j.jmst.2024.02.077

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.197(30)