Study on Optimization of Process Parameters and Microstructure Properties of Laser-Cladded AlCoCrFeNi2.1 Eutectic High Entropy Alloy
Year: 2025
Type: article
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.
Author: LI Zansong, WANG Dongsheng
Institution: Tongling University
Language: English
Topic: High Entropy Alloys Studies
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6887420518
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