Abstract: Amorphous/nanocrystalline composite coatings were prepared by laser crystallization of the FeNiSiBVCRE amorphous coatings fabricated on 45 steel by laser cladding. Microstructure and properties of the amorphous/nanocrystalline composite coatings were studied by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy abrasion tester. The results show that the crystalline phase, amorphous phase and nanocrystalline phase co-existed in the coating. There are a lot of dendritic crystallines of rare earth, boride crystallines in lathshaped and carbide crystallines in graininess both in the bottom and upper zones of the coating. However, in the middle of the coating, there are a lot of nanocrystalline grains embedded on an amorphous matrix. Compared with the amorphous coatings, the wear resistant property of the coating is lowered. The predominant wear mechanisms are adhesion and peeling.

Key words: amorphous, nanocrystalline, coating , laser