Abstract
The micro machinability of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass (BMG) was investigated by micro milling with coated cemented carbide tools. The corresponding micro milling tests on Al6061 were conducted for comparison. The results showed that the tool was still in stable wear stage after milling 300 mm, and the surface roughness Ra could be maintained around 0.06 μm. The tool experienced only slight chipping and rubbing wear after milling the BMG, while a built-up edge and the coating peeling off occurred severely when milling Al6061. The influence of rotation speed on surface roughness was insignificant, while surface roughness decreased with the reduction of feed rate, and then increased dramatically when the feed rate was below 2 μm/tooth. The surface roughness increased gradually with the axial depth of cut (DOC). Milling force decreased slightly with the increase in rotation speed, while it increased with the increase in axial DOC, and the size effect on milling force occurred when the feed rate decreased below 1 μm/tooth. The results of X-ray diffraction (XRD) showed that all milled surfaces were still dominated by an amorphous structure. This study could pave a solid foundation for structural and functional applications.
Highlights
Due to the lack of a long-range ordered atomic structure, metallic glasses generally do not have crystallites, grain boundaries, and dislocations
Void formation, and viscous flow were observed in chip morphology
Jiang and Dai [8] proposed that the underlying formation mechanism of lamellar chips in cutting Vit 1 bulk metallic glass was the symmetry breaking of free volume flow and source, rather than thermal instability
Summary
Due to the lack of a long-range ordered atomic structure, metallic glasses ( called amorphous alloys) generally do not have crystallites, grain boundaries, and dislocations. The special structure and metastable state provide unusual properties, including superior strength, hardness, and elastic strain limit, as well as excellent corrosion and wear resistance [1]. They drew great attention in both academic and industrial fields due to their structural and functional applications [2]. Void formation, and viscous flow were observed in chip morphology. Jiang and Dai [8] proposed that the underlying formation mechanism of lamellar chips in cutting Vit 1 bulk metallic glass was the symmetry breaking of free volume flow and source, rather than thermal instability. Fujita et al [9] investigated the cutting characteristics of both Zr65Cu15Ni10Al10 and Pd40Cu30Ni10P20
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