Effect of laser remelting treatment on Al₈₅Ni₈Y₄Ce₃ amorphous coating

Abstract

Al 85 Ni 8 Y 4 Ce 3 amorphous coatings were prepared on Q235 steel by laser thermal spraying and laser remelting. The structure and thermodynamic behaviour of the coating were analysed by scanning electron microscope, energy-dispersive spectrometer, X-ray diffractometer and differential scanning calorimeter. The microhardness distribution and wear properties of the coating were investigated by microhardness tester and wear tester. The results revealed that a small number of pores and AlFeNi crystal phases presented on the surface of spraying coating, and the remelting layer presented a dense structure with a smooth surface. The volume fraction of the amorphous phase in the remelting layer was 89.9% that indicated a better glass-forming ability. The surface microhardness of the spraying coating was 754.2 HV 0.2 , and the hardness of the remelted layer was 847.6 HV 0.2 . After laser remelting treatment, the friction coefficient of the coating decreases by 20% and the wear resistance increases by 31%.

Surface amorphization of Mg-Zn-Ca alloy by laser rapid melting for orthopaedic applications

“…Nowadays, there are a few attempts to produce amorphous layers of different metals by laser processing technologies to improve the corrosion resistance and mechanical properties of the alloy, such as Ti-based, Fe-based, and Al-based amorphous alloys [27-32]. Zhang et al have prepared the Mg-Zn-Ca amorphous/crystalline composite layers by laser rapid melting, and the composite layer has excellent corrosion resistance [33].…”