MICROSTRUCTURE AND PROPERTIES OF LASER CLADDED TiNiCoCrVSi HIGH ENTROPY ALLOY COATING

Hongxia Zhang, Jingjie Dai (), Caixia Sun and Shouying Li ()
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Hongxia Zhang: College of Intelligent Manufacturing and Control Engineering, Shandong Institute of Petroleum and Chemical Technology, Dongying 257061, Shandong, P. R. China†Dongying Key Laboratory of Mechanical Surface Engineering and Tribology Shandong Institute of Petroleum and Chemical Technology, Dongying 257061, Shandong, P. R. China‡School of Mechanical and Electronic Engineering, Qingdao Binhai University, Qingdao 266555, Shandong, P. R. China
Jingjie Dai: ��School of Mechanical and Electronic Engineering, Qingdao Binhai University, Qingdao 266555, Shandong, P. R. China
Caixia Sun: College of Intelligent Manufacturing and Control Engineering, Shandong Institute of Petroleum and Chemical Technology, Dongying 257061, Shandong, P. R. China†Dongying Key Laboratory of Mechanical Surface Engineering and Tribology Shandong Institute of Petroleum and Chemical Technology, Dongying 257061, Shandong, P. R. China‡School of Mechanical and Electronic Engineering, Qingdao Binhai University, Qingdao 266555, Shandong, P. R. China
Shouying Li: ��School of Mechanical and Electronic Engineering, Qingdao Binhai University, Qingdao 266555, Shandong, P. R. China

Surface Review and Letters (SRL), 2024, vol. 31, issue 02, 1-10

Abstract: A TiNiCoCrVSi high entropy alloy (HEA) coating was prepared on Ti–6Al–4V alloy by laser cladding. Then, the microstructure, phase composition, hardness, wear resistance and high-temperature oxidation resistance of the prepared coatings were investigated. The wear behavior of the TiNiCoCrVSi coating against a Si3N4 ball was evaluated under dry sliding conditions. The high-temperature oxidation resistance was tested at 800∘C. The results show that the phase structure of the TiNiCoCrVSi coating was mainly composed of a body-centered cubic (BCC) (Ni,Co)Ti2 and (Ti,V)5Si3. The TiNiCoCrVSi coating has a high hardness, and the highest surface hardness was 1357 HV. The wear volume of the coating was 1/7 of that of Ti–6Al–4V. The wear mechanism was abrasive wear and oxidative wear. The TiNiCoCrVSi coating exhibited good high-temperature oxidation resistance at 800∘C. A dense oxide film (TiO2, Cr2O3 and NiCr2O4) was formed on the surface of the coating. The dense oxide film prevented oxidation. The high-temperature oxidation resistance of the coating was 1/12 of that of the substrate.

Keywords: Coating; laser; cladding; wear; oxidation; hardness (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1142/S0218625X24500100

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