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Effect of vanadium addition on the microstructure, hardness, and wear resistance of Al0.5CoCrCuFeNi high-entropy alloy

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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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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, R.O.C. Taiwan

    Min-Rui Chen (Postgraduate Student), Su-Jien Lin (Professor), Jien-Wei Yeh (Professor) & Ming-Hao Chuang Ph.D. (Student)

  2. Materials Science Center, National Tsing Hua University, Hsinchu 300, R.O.C. Taiwan

    Swe-Kai Chen (Professor)

  3. Department of Mechanical and Electronic Engineering, Shaoguan University, 512005, Shaoguan City, Guangdong, P.R. China

    Yuan-Sheng Huang (Professor)

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  1. Min-Rui Chen
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  2. Su-Jien Lin
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  3. Jien-Wei Yeh
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  4. Ming-Hao Chuang Ph.D.
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  5. Swe-Kai Chen
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  6. Yuan-Sheng Huang
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Chen, MR., Lin, SJ., Yeh, JW. et al. Effect of vanadium addition on the microstructure, hardness, and wear resistance of Al0.5CoCrCuFeNi high-entropy alloy. Metall Mater Trans A 37, 1363–1369 (2006). https://doi.org/10.1007/s11661-006-0081-3

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  • DOI: https://doi.org/10.1007/s11661-006-0081-3

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