Abstract
Quasi-static and dynamic deformation behavior of a Ti48Zr 20Nb12Cu5Be15 bulk-metallic-glass composite (BMGC) were investigated at cryogenic temperature (77 K). Results demonstrate that the composite shows good plasticity at quasi-static deformation, but brittle fracture occurs during dynamic deformation. Compared with quasi-static deformation which is insensitive to strain rate, dynamic deformation of the composites exhibits negative strain-rate response that the fracture strength decreases with increasing strain rate. The matrix is believed to dominate the strain-rate response of the present BMGC at cryogenic deformation. Thermal softening due to significant temperature rising in shear band is believed to be responsible for negative strain-rate response during dynamic deformation at cryogenic temperature.
Original language | English |
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Pages (from-to) | 228-230 |
Number of pages | 3 |
Journal | Materials Letters |
Volume | 117 |
DOIs | |
State | Published - 15 Feb 2014 |
Keywords
- Amorphous materials
- Composite materials
- Cryogenic temperature
- Deformation and fracture
- Titanium alloy