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논문 기본 정보

자료유형
학술저널
저자정보
Jingbo Qiao (Yantai University) Hongmin Zhang (Yantai University) Haoyan Meng (Yantai University) Fanchao Meng (Yantai University) Yang Tong (Yantai University) Daiyi Chao (Shandong Institutes of Industrial Technology) Peter K. Liaw (The University of Tennessee) Shuying Chen (Yantai University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.30 No.2
발행연도
2024.2
수록면
380 - 392 (13page)
DOI
10.1007/s12540-023-01500-z

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초록· 키워드

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The equiatomic high entropy alloy (HEA) NiCoCrFePd crystalizes as a single face-centered cubic (FCC) phase with stronglocal lattice distortion due to large atomic size mismatch between Pd element and other constitute elements. To betterunderstand this quinary alloy, a family of single FCC phase equiatomic alloys made from the constituent elements of theNiCoCrFePd HEA, including the binary NiPd alloy, medium entropy alloys (MEAs) of NiCoPd, NiCrPd, and NiFePd, andthe quinary NiCoCrFePd HEA with fully-recrystallized microstructure was experimentally investigated to understand thechemical effects on grain growth kinetics and solid solution hardening. With the principal elements increasing from two tofive, the grain growth was increasingly inhibited in the annealing temperature range of 800–900 °C, while at 1000 °C andabove, the NiCrPd MEA showed the slowest grain growth, which may attribute to the higher melting temperature of Crand negative mixing enthalpy between Cr and other constituent elements, increasing the activation energy of grain growth. Moreover, the hardness depending on the grain size complied with the Hall-Petch relationship, in which NiCoPd exhibitedthe lowest hardness, while NiPd had a comparable hardness with NiCrPd and NiFePd. The above results suggested thatthe number of alloying elements was not the sole factor determining the sluggish diffusion and hardness. Instead, thetype of constituent elements in the Pd-containing multicomponent alloys played more critical role. Furthermore, it wasconcluded that the strength of MEAs and HEA should depend on the combination of atomic size and modulus mismatchand electronegativity difference.

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