Strengthening CoCrFeNi High Entropy Alloy by In-Situ Phases of Laves and ZrC

Xiugang Chen; Gang Qin; Xuefeng Gao; Ruirun Chen; Qiang Song; Hongzhi Cui

doi:10.1007/s12540-022-01314-5

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자료유형: 학술저널

저자정보: Xiugang Chen (Shandong University of Science and Technology) Gang Qin (Harbin Institute of Technology) Xuefeng Gao (Harbin Institute of Technology) Ruirun Chen (Shandong University of Science and Technology) Qiang Song (Shandong University of Science and Technology) Hongzhi Cui (Shandong University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.5

발행연도: 2023.5

수록면: 1,390 - 1,398 (9page)

DOI: 10.1007/s12540-022-01314-5

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To attain in-situ ceramic-reinforced phases by adding C powder, Zr pure metal in face-centered cubic (FCC) type CoCrFeNihigh entropy alloy (HEA), a series of (CoCrFeNi)100-x(ZrC)x (x = 0, 2, 4, 6, 8 atomic percent, at%) high entropy alloyswere synthesized by vacuum arc melting. The phase composition, microstructure, tensile properties were studied in thiswork. It is found that the alloys possess microstructure of FCC phase, (Zr, Ni)-rich Laves and ZrC phases. The in-situsynthesis ZrC phase is randomly precipitated in the dendrite. Eutectic-like microstructure is formed by the Laves andNi-poor FCC, which is generated in the dendritic region. With the addition of Zr, C elements, the volume fraction of ZrCand Laves phases increases gradually from 0 to 7% and 18% respectively. The ultimate tensile strength of the alloy is upto 600 MPa with the increasing of Zr, C content. The fracture mechanism of (CoCrFeNi)100-x(ZrC)x (x = 2, 4, 6, 8 at%)is mixed fracture with multiple fracture modes. The increase of strength of (CoCrFeNi)100-x(ZrC)x HEAs mainly comesfrom the second phase strengthening fabricated by ZrC and Laves phases. The strain of the alloy maintains a high valuedue to the eutectic structure formed in the interdendritic region. The effect of mixing enthalpy (ΔHmix) and large atomicradius difference ( ) promotes the formation of in-situ ZrC phase in (CoCrFeNi)100-x(ZrC)x, and the coordination effectof reduced VEC and increased electronegativity difference (Δ ) promotes the formation of Laves.

#In-situ synthesis · High entropy alloy · ZrC phase · Tensile property

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