Influence of rare earths on Fe-based amorphous composite coatings by laser cladding

The influence of rare earths (RE)on the laser cladded Fe-based amorphous composite coatings was investigated by micor alloying.X-ray diffraction and scanning electron microscopy was used to study the phase, microstructure and the influence of RE on the fabrication of the amorphous phase.The results show that the glass formation ability of the Fe38Ni30Si16B14V2 amorphous alloy can be enhanced by micor alloying of RE which is helpful for the synthesis of the amorphous phase under the condition of laser cladding.The crystallzation system of the amorphous alloy is changed by the addition of RE.It enhances crystallzation of the γ-Fe, Ni phase and depresses the crystalline of Fe₂B phase while the the atomic fraction of RE is equal to 1.When it is equal to 2, both of the phases are depressed.The microhardness of the coatings lowers with the micor alloying of RE.The microhardness of the coating decreases along the depth of the coating.