Selective Laser Melting Forming Of Zr-Cu-Al-Co Amorphous Alloy Powder Process Research

Compared with traditional crystalline alloys,Zr-based amorphous alloys have different micro-structurs,which show excellent mechanical and electrochemical characteristics.Zr-based amorphous alloys heve been used in Military,medical,electronic products and other fields.However,the traditional preparation of Zr-based amorphous alloy materials is the mold cust method,which limits the critical size（the maximum size is only centimeters）and the complex structure of the specimen.These limitation lead to the botteneck of development of amorphous alloys.Additive manufacture technology breaks throuhg the size and complex structure limitations of amorphous alloys.Some Zr-based amouphous alloy composites with excellent mechanical properties have draw much attention in material science in recent years,and the additive manufacture parameters of these alloys are worthy to study.In this study,Zr₄₇Cu₄₆Al₆Co₁powder was used as raw material for selective laser melting（SLM）process.Zr-Cu-Al-Co amorphous alloy materials are fabricated by selective laser melting with different processing parameters.Through the preparation of SLM shaped samples and their post-treatment,the density,X-ray,scanning electron microscopy,microhardness and compression experiments were performed on SLM shaped samples of zirconium-based amorphous alloys.The microstructure and properties of zirconium based amorphous alloy SLM molding specimens were analyzed,and the influence law between microstructure and properties of zirconium based amorphous alloy SLM molding specimens and laser melting molding process parameters of zirconium based amorphous alloy powder was summarized.The results show that:1)with the laser power of 200w,the scanning speed of1000mm/s and the scanning interval of 60μm,the SLM shaped specimen of Zr-Cu-Al-Co amorphous alloy with no crack,high hardness and good molding quality can be prepared.The compressive strength was 1190Mpa,and the hardness was up to 524.58HV,which is obviously better than the castings of the same material and has reached the application level;2)the specimens prepared by this process parameter have more B2-Cu Zr crystals and are larger and longer,resulting in high compressive strength and hardness;3)through studying the mechanical properties of SLM shaped zirconium matrix specimens,the following rules are found:as the scanning interval increases,the surface hardness parallel to the cladding layer decreases,while the density increases;with the increase of scanning speed,the hardness and densification perpendicular to the cladding surface decreas;the hardness of the surface parallel to the cladding layer is higher than that perpendicular to the cladding layer.