Alloying Behavior and Properties of FeSiBAlNiCox High Entropy Alloys Fabricated by Mechanical Alloying and Spark Plasma Sintering

Wen Wang; Boyu Li; Sicheng Zhai; Juan Xu; Zuozhe Niu; Jing Xu; Yan Wang

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자료유형: 학술저널

저자정보: Wen Wang (University of Jinan) Boyu Li (University of Jinan) Sicheng Zhai (University of Jinan) Juan Xu (University of Jinan) Zuozhe Niu (University of Jinan) Jing Xu (University of Jinan) Yan Wang (University of Jinan)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.5

발행연도: 2018.1

수록면: 1,112 - 1,119 (8page)

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In this paper, FeSiBAlNiCo x ( x = 0.2, 0.8) high-entropy alloy (HEA) powders were fabricated by mechanical alloying process,and the powders milled for 140 h were sintered by spark plasma sintering (SPS) technique. The microstructures andproperties of as-milled powders and as-sintered samples were investigated. The results reveal that the fi nal milling products(140 h) of both sample powders present the fully amorphous structure. The increased Co contents obviously enhance theglass forming ability and thermal stability of amorphous HEA powders, which are refl ected by the shorter formation time offully amorphous phase and the higher onset crystallization temperature, respectively. According to coercivity, the as-milledFeSiBAlNiCo x ( x = 0.2, 0.8) powders (140 h) are the semi-hard magnetic materials. FeSiBAlNiCo 0.8 HEA powders possessthe highest saturation magnetization and largest remanence ratio. The SPS-ed products of both bulk HEAs are composedof body-centered cubic solid solution, and FeSi and FeB intermetallic phases. They possess the high relative density above97% and excellent microhardness exceeding 1150 HV. The as-sintered bulks undergo the remarkable increase in saturationmagnetization compared with the as-milled state. The SPS-ed FeSiBAlNiCo 0.8 HEA exhibits the soft magnetic properties. The electrochemical corrosion test is carried out in 3.5% NaCl solution. The SPS-ed FeSiBAlNiCo 0.2 HEA reveals the betterpassivity with low passive current density, and the higher pitting resistance with wide passive region.

참고문헌 (34)

참고문헌 신청

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M. Feuerbacher / 2015 / Philos. Mag. 95:1221

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