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Effect of Co and Gd Additions on Microstructures and Properties of FeSiBAlNi High Entropy Alloys

School of Materials Science and Engineering, University of Jinan, Jinan 250022, China
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Entropy 2018, 20(7), 487; https://doi.org/10.3390/e20070487
Received: 10 April 2018 / Revised: 18 June 2018 / Accepted: 19 June 2018 / Published: 22 June 2018
(This article belongs to the Special Issue New Advances in High-Entropy Alloys)
FeSiBAlNi (W5), FeSiBAlNiCo (W6-Co), and FeSiBAlNiGd (W6-Gd) high entropy alloys (HEAs) were prepared using a copper-mold casting method. Effects of Co and Gd additions combined with subsequent annealing on microstructures and magnetism were investigated. The as-cast W5 consists of BCC solid solution and FeSi-rich phase. The Gd addition induces the formation of body-centered cubic (BCC) and face-centered cubic (FCC) solid solutions for W6-Gd HEAs. Whereas, the as-cast W6-Co is composed of the FeSi-rich phase. During annealing, no new phases arise in the W6-Co HEA, indicating a good phase stability. The as-cast W5 has the highest hardness (1210 HV), which is mainly attributed to the strengthening effect of FeSi-rich phase evenly distributed in the solid solution matrix. The tested FeSiBAlNi-based HEAs possess soft magnetism. The saturated magnetization and remanence ratio of W6-Gd are distinctly enhanced from 10.93 emu/g to 62.78 emu/g and from 1.44% to 15.50% after the annealing treatment, respectively. The good magnetism of the as-annealed W6-Gd can be ascribed to the formation of Gd-oxides. View Full-Text
Keywords: high entropy alloys; elemental addition; annealing treatment; magnetic property; microhardness high entropy alloys; elemental addition; annealing treatment; magnetic property; microhardness
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Zhai, S.; Wang, W.; Xu, J.; Xu, S.; Zhang, Z.; Wang, Y. Effect of Co and Gd Additions on Microstructures and Properties of FeSiBAlNi High Entropy Alloys. Entropy 2018, 20, 487.

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