Effect of Ta Addition on Structural Evolution and Mechanical Properties of the CoFeNi₂W_0.5 High Entropy Alloy

Abstract:

A series of CoFeNi₂W_0.5Ta_x (x = 0-0.6) high entropy alloys (HEAs) were synthesized by arc melting to investigate the alloying effect of Ta element on the microstructure and mechanical properties of the CoFeNi₂W_0.5 alloy system. Phase constitution, microstructure and mechanical properties of the alloys were analyzed by X-ray diffraction (XRD), scanning electron microscopes (SEM), Vickers hardness and compressive test. It was found that when x = 0, the alloy consists of a single-phase face-centered cubic (FCC) solid solution structure and exhibit excellent ductility, the compressive plastic elongation of which can reach 80% without fracture. While with increasing Ta content, the brittle Co₂Ta-type Laves phase appears which leads to a decrease of the plastic strain and an increase of the yield strength, and the Vickers hardness shows an obvious increase from HV 179.5 to HV 753.2.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 34-39
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.34
• Online since: March 2016
• Authors: Li Jiang*, Yong Dong, Hui Jiang, Yi Ping Lu, Zhi Qiang Cao, Ting Ju Li
• Keywords: Alloy Design, High Entropy Alloys, Mechanical Properties, Microstructural Evolution

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