Abstract
Pd40Ni10Cu30P20 bulk metallic glass (BMG) is widely used in industrial fields due to its excellent oxidation resistance, corrosion resistance, and thermal stability. However, the lack of research on the machinability and cutting performance of BMG using single-point diamond turning (SPDT) limits its application for engineering manufacturing. In the present research, a series of turning experiments were carried out under different cutting parameters, and the machinability reflected by the quality of machined surface, chip morphology, and tool wear were analyzed. Based on the oxidation phenomenon of the machined surface, a molecular dynamics (MD) simulation was conducted to study the mechanism and suppression of the machined surface oxidation during the cutting. The results show that: (1) The Pd-based BMG had good machinability, where the machined surface roughness could go down to 3 nm; (2) irregular micro/nanostructures were found along the tool path on the outer circular region of the machined surface, which greatly affected the surface roughness; and (3) the cutting heat softened the workpiece material and flattened the tool marks under surface tension, which improved the surface quality. This research provides important theoretical and technical support for the application of BMG in optical mold manufacturing.
Highlights
Bulk metallic glass (BMG), known as amorphous alloy, has a disordered array of atoms, no crystal grains, grain boundaries and dislocations, uniform microstructure, no precipitation phase, and the same structure as glass [1,2]
The results showed that the influence of spindle speed on the machined surface of bulk metallic glass (BMG) was greater than that of the feed rate and depth of cut, and the greater the spindle speed, the smaller the surface toughness [16]
This paper provides an important reference for the research on the ultra-precision machining of BMG, and provides important theoretical and technical support for the turning and manufacturing of BMG in the optical mold process
Summary
Bulk metallic glass (BMG), known as amorphous alloy, has a disordered array of atoms, no crystal grains, grain boundaries and dislocations, uniform microstructure, no precipitation phase, and the same structure as glass [1,2]. BMG has become a new type of engineering material, whose metastability provides unusual material properties, such as excellent strength, hardness and elastic strain limit, and excellent corrosion and wear resistance, as well as unique physical properties, such as thermal, electromagnetic, and electrical properties [3,4,5,6,7]. The research on BMG has developed rapidly, setting off the first climax of condensed matter physics and materials research. BMG has the hardness of ceramics, but when heated to the supercooled liquid state, it softens like plastic and exhibits Newtonian fluid properties. It is an ideal micro/nanomachining material [9], which has been widely used in the field of manufacturing and molding. In the field of 3D printing, Shen et al used 3D-printed Zr52.5 Ti5 Al10 Ni14.6 Cu17.9 BMG to Micromachines 2020, 11, 4; doi:10.3390/mi11010004 www.mdpi.com/journal/micromachines
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