Compression testing shows that at low-oxygen levels (240 ppm) the Cu49Hf42Al9 glass deforms predominantly by shear and is quite tough. Specimens with higher oxygen levels (1700 ppm) have oxygen-containing dendrites in an amorphous matrix and show no plasticity. Importantly, the dominant fracture mode is not shear but local tensile failure. Although there is a slight reduction in the toughness of the glassy matrix, the severe embrittlement is primarily because of the brittle dendrites that facilitate crack initiation and propagation.
- Bulk amorphous materials
- Cu-based bulk metallic glasses
- Metallic glasses