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Open AccessArticle

Compositional Dependence of Phase Selection in CoCrCu0.1FeMoNi-Based High-Entropy Alloys

School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Brunel Centre for Advanced Solidification (BCAST), Brunel University, Kingston Lane, London UB8 3PH, UK
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1290;
Received: 22 June 2018 / Revised: 23 July 2018 / Accepted: 24 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue High Entropy Alloys)
To study the effect of alloy composition on phase selection in the CoCrCu0.1FeMoNi high-entropy alloy (HEA), Mo was partially replaced by Co, Cr, Fe, and Ni. The microstructures and phase selection behaviors of the CoCrCu0.1FeMoNi HEA system were investigated. Dendritic, inter-dendritic, and eutectic microstructures were observed in the as-solidified HEAs. A simple face centered cubic (FCC) single-phase solid solution was obtained when the molar ratio of Fe, Co, and Ni was increased to 1.7 at the expense of Mo, indicating that Fe, Co, and Ni stabilized the FCC structure. The FCC structure was favored at the atomic radius ratio δ ≤ 2.8, valence electron concentration (VEC) ≥ 8.27, mixing entropy ΔS ≤ 13.037, local lattice distortion parameter α2 ≤ 0.0051, and ΔS/δ2 > 1.7. Mixed FCC + body centered cubic (BCC) structures occurred for 4.1 ≤ δ ≤ 4.3 and 7.71 ≤ VEC ≤ 7.86; FCC or/and BCC + intermetallic (IM) mixtures were favored at 2.8 ≤ δ ≤ 4.1 or δ > 4.3 and 7.39 < VEC ≤ 8.27. The IM phase is favored at electronegativity differences greater than 0.133. However, ΔS, α2, and ΔS/δ2 were inefficient in identifying the (FCC or/and BCC + IM)/(FCC + BCC) transition. Moreover, the mixing enthalpy cannot predict phase structures in this system. View Full-Text
Keywords: high-entropy alloy; microstructure; eutectic structure; phase selection high-entropy alloy; microstructure; eutectic structure; phase selection
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Liu, N.; Chen, C.; Chang, I.; Zhou, P.; Wang, X. Compositional Dependence of Phase Selection in CoCrCu0.1FeMoNi-Based High-Entropy Alloys. Materials 2018, 11, 1290.

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