Microstructure and Wear Resistance of Fe₄CoCrNiB_0.2Mo _x (x=0, 0.5, 1) High Entropy Alloys

Abstract

To improve the wear resistance of Fe₄CoCrNiB_0.2 high-entropy alloy (HEA), the Fe₄CoCrNiB_0.2Mo _x (where, x in Fe₄CoCrNiB_0.2Mo _x is a molar content, and the value is 0, 0.5, 1, respectively) HEAs were prepared on the Q235 substrate by laser cladding. The structure, hardness, and wear resistance of Fe₄CoCrNiB_0.2Mo _x HEAs were investigated using scanning electron microscopy with spectroscopy (SEM/EDS), X-ray diffraction (XRD), Vickers microhardness tester, and pin-on-disc tribometer. The influences of Mo content on the phase structures and mechanical properties of Fe₄CoCrNiB_0.2Mo _x HEAs are studied. The experimental results show that the Fe₄CoCrNiB_0.2Mo _x HEA cladding layers are composed of a simple BCC phase mixed with M₂B phase, BCC phase, and BCC + FCC dual-phase, respectively. The wear resistance and hardness of the Fe₄CoCrNiB_0.2Mo HEA sample are 2 and 1.35 times those of the Fe₄CoCrNiB_0.2 HEA sample, respectively. The microhardness and wear resistance of the Fe₄CoCrNiB_0.2Mo _x HEAs increase with the increase of Mo content. It is found that the Fe₄CoCrNiB_0.2Mo _x HEA cladding layers are mainly strengthened by the solid solution strengthening and fine-grained strengthening.

Keywords

SEM / XRD / high-entropy alloys / laser cladding

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