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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 12/2015

01-12-2015

Effects of Tungsten on Microstructure and Mechanical Properties of CrFeNiV0.5W x and CrFeNi2V0.5W x High-Entropy Alloys

Authors: Hui Jiang, Li Jiang, Kaiming Han, Yiping Lu, Tongmin Wang, Zhiqiang Cao, Tingju Li

Published in: Journal of Materials Engineering and Performance | Issue 12/2015

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Abstract

CrFeNiV0.5W x and CrFeNi2V0.5W x (x = 0.25, 0.5, 0.75, and 1.0) high-entropy alloys were prepared by vacuum arc melting. The effects of W element on the microstructures and mechanical properties of these alloys were investigated. The experimental results indicated that the CrFeNiV0.5W x alloys were composed of σ, FCC, and BCC phases. Although the microstructures of the CrFeNi2V0.5W x alloys were still constituted by FCC, BCC, and σ phases, the volume fraction of the FCC phase increased significantly. Dendrite morphology was also observed in the CrFeNi2V0.5W x alloys. With the addition of W element, the hardness of the CrFeNiV0.5W x alloys declined from 869 to 633 HV, while the hardness of the CrFeNi2V0.5W x alloys increased from 226 to 305 HV. Moreover, the CrFeNi2V0.5W x alloys exhibited better compressive ductility than the CrFeNiV0.5W x alloys. This study was the first known incidence in which the FCC phase increased in the HEAs with a decrease of the valence electron concentration (VEC) value (i.e., the FCC phase of the CrFeNiV0.5W x alloys increased with the addition of the BCC-structured W elements).
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Metadata
Title
Effects of Tungsten on Microstructure and Mechanical Properties of CrFeNiV0.5W x and CrFeNi2V0.5W x High-Entropy Alloys
Authors
Hui Jiang
Li Jiang
Kaiming Han
Yiping Lu
Tongmin Wang
Zhiqiang Cao
Tingju Li
Publication date
01-12-2015
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 12/2015
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-015-1767-8

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