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Entropy, Vol. 20, Pages 487: Effect of Co and Gd Additions on Microstructures and Properties of FeSiBAlNi High Entropy Alloys

Entropy, Vol. 20, Pages 487: Effect of Co and Gd Additions on Microstructures and Properties of FeSiBAlNi High Entropy Alloys

Entropy doi: 10.3390/e20070487

Authors: Sicheng Zhai Wen Wang Juan Xu Shuai Xu Zitang Zhang Yan Wang

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.

Authors:   Zhai, Sicheng ; Wang, Wen ; Xu, Juan ; Xu, Shuai ; Zhang, Zitang ; Wang, Yan
Journal:   Entropy
Volume:   20
edition:   7
Year:   2018
Pages:   487
DOI:   10.3390/e20070487
Publication date:   22-Jun-2018
Facts, background information, dossiers
  • entropy
  • BCC
  • additions
  • stability
  • solution
  • oxides
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