Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 30    No. 7    July 2020

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Decomposition kinetics of carbon-doped FeCoCrNiMn high-entropy alloy at intermediate temperature
Jian PENG1, Zi-yong LI1, Xin-bo JI1, Yan-le SUN1, Li-ming FU1,2,3, Ai-dang SHAN1,2,3

1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Collaborative Innovation Center for Advanced Ship and Deep-sea Exploration (CISSE), Shanghai Jiao Tong University, Shanghai 200240, China;
3. Shanghai Key Laboratory of High Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China

Abstract:Phase decomposition kinetics and the corresponding mechanical properties of the severe cold-rolled (SCRed) carbon-doped (1.3 at.%) equimolar FeCoCrNiMn high-entropy alloy (HEA) after being annealed at 500 °C were investigated. This single face-centered cubic (FCC) solid-solution HEA decomposed to M23C6+L10, B2, and σ in chronological order. The formation kinetics of the L10, B2, and σ phases followed the Johnson-Mehl-Avrami- Kolmogorov (JMAK) equation. The yield strength of the HEA was 1520 MPa and increased to 1920 MPa after being annealed at 500 °C for 1 h, as a result of the formation of nanosized M23C6 and L10. Both strength and ductility decreased after 2 d of annealing due to the increase of volume fractions and the coarsening of the M23C6 and L10 precipitates. From 4 to 32 d, the hardness was found to increase, which is ascribed to the rapid formation of the B2 and σ phases. From 32 to 64 d, the hardness increased further to finally reach about HV 760, with the FCC matrix almost exhausted to form the M23C6, L10, B2, and σ phases. The results of this work may serve as a guide for the heat-treatment of carbon-doped HEAs.


Key words: FeCoCrNiMn; high-entropy alloy; decomposition kinetics; mechanical properties; carbon doping

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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