Abstract
Mirco-machinability of Zr 55 Cu 30 Al 10 Ni 5 bulk metallic glass including surface integrity, cutting force, chip morphology, and tool wear was investigated by means of ultra-precision cutting with a diamond tool and a boron nitride tool. The results showed that the metallic glass only attained the lowest surface roughness of about R a 100 nm and was difficult to cut to achieve a mirror surface due to its viscous flow even using a depth of cut of 0.6 μm. An empirical metal micro-cutting force model was applicable for the bulk metallic glass only under the condition that the undeformed chip thickness was larger than the tool edge radius. The diamond tool showed a better wear resistance but a worse machined surface quality as compared to the PCBN tool. TEM observation and nanoindentation analysis indicated that nanocrystallization of the metallic glass and work softening were detected after the micro-machining. Besides, the generation of shear bands and its effect on the machinability of the bulk metallic glass were disscussed.
| Original language | English |
|---|---|
| Pages (from-to) | 1-12 |
| Number of pages | 12 |
| Journal | Materials and Design |
| Volume | 136 |
| Early online date | 21 Sept 2017 |
| DOIs | |
| Publication status | Published - 15 Dec 2017 |
Funding
This work was supported by China Postdoctoral Science Foundation (grant no. 2017M612447 ) and the National Natural Science Foundation of China (grant no. 51375195 ). The authors thank the Analytical and Testing Center of Huazhong University of Science and Technology .
Keywords
- Bulk metallic glass
- Machinability
- Microstructure
- Surface roughness
- Ultra-precision cutting
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