Abstract
Bulk metallic glass was subjected to extreme deformation conditions during machining operation. The flash temperature, oxidation and crystallization within chips from a Zr-based bulk metallic glass were investigated. A near-infrared spectrometer was used to capture the light emission from the tool-chip interface allowing the calculation of the temperature. Very high temperatures in the 2400-2700 K range were observed and associated with the light emission and oxidation in the chips. X-ray diffraction analysis revealed oxidation of chips machined at high cutting speeds. Optical micrographs of polished and etched chip cross-sections showed a dendritic pattern due to crystallization. Using a field emission gun SEM, amorphous and crystalline regions were analyzed. This study demonstrates the oxidation and crystallization of bulk metallic glass during machining.
| Original language | English |
|---|---|
| Pages (from-to) | 195-204 |
| Number of pages | 10 |
| Journal | Intermetallics |
| Volume | 12 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 2004 |
Funding
The authors would like to thank Dr. Edgar Lara-Curzio for helpful suggestions. This research is partially sponsored the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Dept. of Energy under contract DE-AC05-00OR22725.
| Funders | Funder number |
|---|---|
| Office of Transportation Technologies | |
| U.S. Department of Energy | DE-AC05-00OR22725 |
| Office of Energy Efficiency and Renewable Energy | |
| Oak Ridge National Laboratory |
Keywords
- B. Metallic glasses
- B. Oxidation
- C. Machining
- F. Scanning
- F. X-ray diffraction