Improvement on Mechanical Properties of a bcc Matrix Al8(FeCuCrMn)92 High-Entropy Alloy by Phase Modulation of Interstitial Carbon Element

Conghui Hu; Jianlei Zhang; Yunhu Zhang; Ke Han; Changjiang Song; Qijie Zhai

doi:10.1007/s12540-021-01063-x

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자료유형: 학술저널

저자정보: Conghui Hu (Shanghai University) Jianlei Zhang (Shanghai University) Yunhu Zhang (Shanghai University) Ke Han (Florida State University) Changjiang Song (Shanghai University) Qijie Zhai (Shanghai University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International 제27권 제2호

발행연도: 2022.2

수록면: 523 - 533 (11page)

DOI: 10.1007/s12540-021-01063-x

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High-entropy alloys (HEAs) are novel multi-element alloys based on five or more constituent elements in a range of 5?35 at%. Here we present a method to improve strength of a body-centered cubic (bcc) matrix HEA without loss of ductility. Theimprovement was achieved by phase modulation combined other strengthening effect of interstitial carbon addition. Carbonaddition can enhance strength and retain good ductility in some steels because carbon increases the volume fraction offace-centered cubic (fcc) phase. We used the same principle to design and fabricate a set of Al8(FeCuCrMn)92Cx (x = 0, 1,2, 3, 4 at%) HEAs under near-rapid solidification. Our results showed that carbon addition modulated constituent phases byincreasing the volume fraction of fcc phase and carbides. As a result, addition of carbon increased yield strength of this bccmatrix HEA. But the ductility decreased, especially when carbon content was higher than 3 at%, which was ascribed to unevendistribution of Cu-rich fcc phase and carbides precipitated in bcc phase region. After annealing at 1173 K for 2 h, additionof 1 at% carbon improved yield strength without compressive fracture. It demonstrated that a proper carbon content additionwith annealing can enhance the yield strength without loss of ductility for this bcc matrix HEA. Thus, interstitial carbon additionis a meaningful method to improve the mechanical properties by phase modulation combined other strengthening effect.

#High-entropy alloys · Bcc matrix · Phase modulation · Interstitial carbon

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