点击次数：

论文类型：期刊论文

发表时间：2015-04-01

发表刊物：APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

收录刊物：SCIE、EI、Scopus

卷号：119

期号：1

页面范围：291-297

ISSN号：0947-8396

摘要：A series of CoFeNi2V0.5Nbx (x = 0-1) high-entropy alloys (HEAs) were synthesized to investigate the alloying effect of the Nb element on the microstructures and properties. It was found that the microstructures change from initial single-phase FCC solid solutions (x = 0), to a hypoeutectic microstructure (0 < x < 0.75), then to a fully eutectic microstructure (x = 0.75), and finally to a hypereutectic microstructure (0.75 < x < 1). The eutectic microstructure consists of the FCC solid solution phase and the Fe2Nb-type Laves phase. Nb0 (x = 0) and Nb02 (x = 0.2) alloys exhibit excellent ductility, the compressive plastic elongation of which can reach up to 80 % without fracture. With increasing Nb content, increased brittle Laves phase leads to the decrease of the plastic strain and the increase of the yield strength, and the Vickers hardness shows an approximately linear increase from HV 133.4 to HV 687.7. Besides, the CoFeNi2V0.5Nbx HEAs exhibit excellent soft magnetic behavior, in which the Nb0 alloy shows the maximum saturation magnetization (M (s)) of 70.33 emu/g, and minimum coercivity (H (c)) of 1.62 Oe.