Study On Technique, Composition And Property Of ZrAlNiCu Amorphous Alloy Coatings

Zr-based amorphous alloy has excellent glass forming ability and wide supercooled liquid region, making it a popular alloy system for the production of amorphous alloy. This study, which took two parallel steps, systematically focused on solutions to the drawbacks of laser cladding of Zr-based amorphous alloy.First, based on recent study on the field of bulk metallic glass, Zr63.8Ni17.2Al11.4Cu7.6powder and Zr65Ni10Al7.5Cu17.5powder were cladded by laser beam separately as contrast experiments. Second, traditional laser cladding technique was compared with the TIG cladding+laser remelting technique through the cladding of Zr63.8Ni17.2Al11.4Cu7.6powder using corresponding parameters.Microstructure analysis, microhardness analysis, phase composition analysis, hardness test and corrosion test were conducted after the coatings were prepared. Several conclusions were drawn:each kind of the coatings above has a finer microstructure, higher hardness and higher corrosion resistance; The theory that Zr63.8Ni17.2Al11.4Cu7.6has better glass forming ability than Zr65Ni10Al7.5Cu17.5can also be applied in the field of amorphous cladding; TIG cladding+laser remelting technique is superior in solving the drawbacks of laser cladding i.e., unevenness, cracks, pores and inhomogeneity; amorphous content is higher in Zr63.8Ni17.2Al11.4Cu7.6laser cladding than Zr65Ni10Al7.5Cu17.5laser cladding, and higher in TIG cladding+laser remelting coating than laser cladding, under corresponding parameters. Corrosion resistance of Zr63.8Ni17.2Al11.4Cu7.6cladding is higher than that of Zr65Ni10Al7.5Cu17.5, TIG cladding+laser remelting coating higher than laser cladding.