Effect of High Entropy Alloy Coating on Microstructure and Mechanical Properties of Al/Fe Liquid-Solid Bimetal Composite
MA Jingbo1, WANG Tao1, CHEN Chong1,2,*, XIONG Mei2, XIAO Liqiang2, WEI Shizhong2, MAO Feng2, ZHANG Cheng2
1 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, China 2 National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials, Henan University of Science and Technology, Luoyang 471003, Henan, China
Abstract: FeCoCrNiAl high entropy alloy coating was thermal sprayed on the surface of 45 steel by high-velocity oxygen fuel spray process, and aluminum/steel bimetal composites were prepared by liquid-solid composite method in this work. The effect of high entropy alloy coating on the interfacial microstructure and properties of aluminum/steel bimetal was studied. Isothermal sections of Al-Fe-Si system at 600 ℃ and 750 ℃ were calculated using Thermo-Calc software. SEM-EDS, EBSD, EPMA, nano-indentation instrument and universal mechanical testing machine were utilized to analyze the interfacial microstructure and properties of the bimetals. The results show that good metallurgical bonding between Al alloy and steel without and with high entropy alloy coating was achieved, and no cracks and other defects were observed at the bimetal interface. The average thickness of transition layer was 24.5 μm and 25.7 μm, respectively. The interfacial transition layers both mainly consisted of Al5Fe2, τ1-(Al, Si)5Fe3, Al13Fe4, τ5-Al7Fe2Si and τ6-Al9Fe2Si2, and the diffusion path between Al alloy and steel was studied accordingly. No high entropy alloy layer was found at the interface of aluminum-steel bimetal after liquid-solid composite by spraying high entropy alloy coating. Co, Cr and Ni elements exist in the matrix and transition layer as solutes. The preferred orientation of Al5Fe2 phase in [001] direction was not changed. The nano-hardness of interfacial transition layer was higher than that of the matrix on both sides, and the average hardness of Al5Fe2 phase in the transition layer was the highest. The dissolution of Co, Cr and Ni into the transition layer have no effect on the hardness of the transition layer. The interfacial shear strength of the bimetal was 8.3 MPa, and raised to 12.2 MPa after spraying high entropy alloy on steel surface, which was increased by 47%. The shear fractures of the bimetals belong to brittle fracture, and the fracture structure is mainly composed of Al5Fe2. After thermal spraying high entropy alloy coating, the fracture of the sample has more tearing edges, and the solid solution of elements in the high entropy alloy coating improves the strength of Al5Fe2 to a certain extent.
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2023, Vol. 37 
