Microstructure and Properties of AlxCoCrFeNi High-entropy Alloys Prepared by Plasma Cladding
WANG Hu1, WANG Zhihui2
1 College of Materials Engineering, North China Institute of Aerospace Engineering, Langfang 065000; 2 College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124
Abstract: The AlxCoCrFeNi(x=1,1.5,x is mole fraction) high-entropy alloys cladding layers were prepared on Q235 steel substrate by plasma cladding. The component, crystal structure, microstructure and microhardness of the cladding layers were investigated. The results indicated that high-entropy alloys cladding layers had simple solid-solution structure. The content of aluminum increased from x=1 to x=1.5, and the phase composition transformed from the mixed FCC+BCC phase to the single BCC phase. The microstructure of cladding layers is dendrite structure. When x=1.5, the nanoparticles were deposited in the dendrite. Al1.5-CoCrFeNi alloy had a good metallurgical combination with the substrate. A ferrite band with width about 80 μm was appeared at HAZ near the interface which was caused by decarburizing of pearlite. With the addition of aluminum changed from x=1 to x=1.5, the microhardness of cladding layers increased from 478HV to 530HV.
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2018, Vol. 32 
