Study on Optimization of Process Parameters and Microstructure Properties of Laser-Cladded AlCoCrFeNi2.1 Eutectic High Entropy Alloy

LI Zansong, WANG Dongsheng

doi:10.16577/j.issn.1001-1560.2025.0083

2025 , Vol. 58 >Issue 5: 113 - 122

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0083

Study on Optimization of Process Parameters and Microstructure Properties of Laser-Cladded AlCoCrFeNi_2.1 Eutectic High Entropy Alloy

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(a.School of Mechanical Engineering，b.Advanced Copper-Based Material Industry Generic Technology Research Center of Anhui Province，c.Anhui Joint Key Laboratory of Critical Technologies for High-End Copper-Based New Materials，d.Additive Manufacturing Future Technology Institute， Tongling University， Tongling 244061， China)

WANG Dongsheng(1978－)，Ph.D.， Professor， Research Focus: Laser Processing， Additive Manufacturing and Surface Engineering， Tel.: 13856292657， E-mail: wangdongsheng＠tlu.edu.cn

Received date: 2025-01-14

Revised date: 2025-02-25

Accepted date: 2025-02-27

Online published: 2025-06-10

Supported by

Excellent Research and Innovation Team in Anhui Province (2024AH010031)； The University Synergy Innovation Program of Anhui Province (GXXT - 2023 - 025； GXXT - 2023 - 026)； Anhui Province Science and Technology Innovation Project(202423i08050011)； Tongling University Scientific Research Project (2024tlxypt03)； Industry-University-Research Collaboration Project of Tongling University (2024tlxyxdz300)

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Abstract

In order to investigate the effects of processing parameters on the microstructure and mechanical properties of the AlCoCrFeNi2.1 eutectic high entropy alloy(EHEA)， an orthogonal experimental design coupled with a comprehensive-scoring method was used to preliminarily identified the optimal laser cladding conditions.Among the tested combinations， Sample 4 (laser power 1 800 W， scanning speed 360 mm/min， powder-feed rate 2.1 r/min) and Sample 5 (laser power 1 800 W， scanning speed 420 mm/min， powder-feed rate 2.4 r/min)received the highest scores.These two specimens were then subjected to multi-pass， single-layer laser cladding， and their microstructures and mechanical properties were systematically characterized.Results showed that the laser-cladded AlCoCrFeNi2.1 EHEA coating was composed predominantly of dual FCC and BCC phases.In the multi-pass coating， Sample 5 displayed a surface dominated by uniform equiaxed grains，whereas Sample 4 exhibited a mixture of columnar and equiaxed grains with larger， irregular sizes.Further investigations showed that Sample 5 possessed superior microhardness and wear resistance:an average hardness of 323.7 HV1.0，an average friction coefficient of 0.64，and markedly lower wear rate (1.16×10－6 mm3∙N－1∙mm－1) and wear volume (14.4 mm3) than Sample 4.Accordingly， the optimal laser-cladding parameters for AlCoCrFeNi2.1 EHEA were determined to be a laser power of 1 800 W， a scanning speed of 420 mm/min， and a powder-feed rate of 2.4 r/min.

Key words： laser cladding; eutectic high entropy alloy; process parameters optimization; microstructure; mechanical properties

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LI Zansong, WANG Dongsheng . Study on Optimization of Process Parameters and Microstructure Properties of Laser-Cladded AlCoCrFeNi_2.1 Eutectic High Entropy Alloy[J]. Materials Protection, 2025 , 58(5) : 113 -122 . DOI: 10.16577/j.issn.1001-1560.2025.0083

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