Effect of vanadium addition on the microstructure, hardness, and wear resistance of Al0.5CoCrCuFeNi high-entropy alloy |
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Authors: | Min-Rui Chen Su-Jien Lin Jien-Wei Yeh Ming-Hao Chuang PhD Swe-Kai Chen Yuan-Sheng Huang |
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Affiliation: | (1) Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, R.O.C. Taiwan;(2) Materials Science Center, National Tsing Hua University, Hsinchu 300, R.O.C. Taiwan;(3) Department of Mechanical and Electronic Engineering, Shaoguan University, 512005 Shaoguan City, Guangdong, P.R. China |
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Abstract: | The authors studied the effect of vanadium addition on the microstructure and properties of Al0.5CoCrCuFeNi high-entropy alloy. The microstructure of Al0.5CoCrCuFeNiV
x
(x=0 to 2.0 in molar ratio) alloys was investigated by scanning electron microscopy, energy dispersive spectrometry, and X-ray
diffraction. With little vanadium addition, the alloys are composed of a simple fcc solid-solution structure. As the vanadium
content reaches 0.4, a BCC structure appears with spinodal decomposition and envelops the FCC dendrites. From x=0.4 to 1.0, the volume fraction of bcc structure phase increases with the vanadium content increase. When x=1.0, fcc dendrites become completely replaced by bcc dendrites. Needle-like σ-phase forms in bcc spinodal structure and increases
from x=0.6 to 1.0 but disappears from x=1.2 to 2.0. The hardness and wear resistance of the alloys were measured and explained with the evolution of the microstructure.
The hardness values of the alloys increase when the vanadium content increases from 0.4 to 1.0 and peak (640 HV) at a vanadium
content of 1.0. The wear resistance increases by around 20 pct as the content of vanadium increases from x=0.6 to 1.2 and levels off beyond x=1.2. The optimal vanadium addition is between x=1.0 and 1.2. Compared with the previous investigation of Al0.5CoCrCuFeNi alloy, the vanadium addition to the alloy promotes the alloy properties. |
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