Metallic glass is a new type of amorphous metal material with excellent mechanical, electromagnetic and optical properties. However, there are many challenges in the preparation of metallic glass, such as strict cooling rate requirements and difficult molding. In recent years, with the continuous development of 3D printing technology, composite laser powder bed fusion (LPBF) printing technology has become a new way to prepare metallic glass. This technology has the advantages of high precision, high speed and high resolution, and can prepare metal parts with complex shapes and excellent properties. Therefore, the purpose of this paper is to explore the application of LPBF printing technology in the preparation of metallic glass, in order to provide new ideas and methods for the application of amorphous metal materials.
(1)Materials & Equipment
The material used in this experiment was Pd-Cu-Si metallic glass, and the metal powder was mixed in the ratio of Pd 40 wt%, Cu 25 wt%, Si 35 wt%. The equipment used includes 3D printers, lasers, scanners, and atmosphere furnaces.
(2)Optimization of printing process parameters
In the printing process, parameters such as laser power, scanning speed, and layer thickness have an important impact on the printing effect. In order to get the best printing results, we have optimized these parameters. First, we tested the density and surface roughness of the printed samples at different laser powers, and found that the samples had the best density and surface roughness when the laser power was 200 W. Secondly, we tested the density and surface roughness of the printed sample at different scanning speeds, and found that the sample had the best density and surface roughness at a scanning speed of 500 mm/s. Finally, we tested the density and surface roughness of the printed samples at different layer thicknesses, and found that the samples had the best density and surface roughness when the layer thickness was 0.1 mm.
2.Results & Discussion
(1)Density and surface roughness of LPBF printed metallic glassBy optimizing the process parameters, we were able to successfully print metallic glass samples with high density and low surface roughness. The density of the sample was measured to be more than 95% and the surface roughness was less than 10 μm. These results indicate that LPBF printing technology can be effectively applied to the preparation of metallic glass.
(2)Characterization of the structure and properties of LPBF printed metallic glassesTo verify the amorphous structure and properties of metallic glasses, characterization experiments such as X-ray diffraction (XRD) and scanning electron microscopy (SEM) were performed. The XRD results show that the printed metallic glass has a typical amorphous structure. The SEM results show that the microstructure of the metallic glass is uniform and defect-free. In addition, we also carried out mechanical property tests and found that the printed metal glass has excellent mechanical properties, such as high strength, high hardness, etc. These results show that LPBF printing technology can effectively prepare amorphous metal materials with excellent properties.
In this paper, the application of laser powder bed fusion (LPBF) printing technology for composite materials in the preparation of metallic glass was studied. By optimizing the process parameters, a metallic glass sample with an amorphous state and a perfect structure was successfully printed. The experimental results show that LPBF printing technology can be effectively applied to the preparation of metallic glass, which is expected to open up a new way for the application of amorphous metal materials. Future research directions include further optimization of process parameters and improved sample performance, as well as expanding the application of this technology in the preparation of other amorphous metal materials.