Crack evolution in bulk metallic glasses
- Institute for Complex Materials, IFW Dresden, P.O. Box 27 01 16, D-01171 Dresden (Germany)
- Advanced Materials Division, Korea Institute of Industrial Technology, Incheon 406-840 (Korea, Republic of)
- Department of Metallurgical Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of)
- Department of Advanced Materials Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 143-747 (Korea, Republic of)
- Caterpillar Advanced Materials Technology Group, Mossville, Illinois, 61552 (United States)
In the present study, the mechanisms underlying plastic deformation of a Ni-based bulk metallic glass (BMG) are explored. Based on the microstructural investigations, a model is proposed how fracture emerges in BMGs. After deformation, the glass is macroscopically more fragile indicating a decrease in the viscosity within the shear bands due to shear softening. These fluctuations of viscosity and therefore Poisson ratio between the deformed and undeformed regions appear to be the initiation sites for nanometer-scale cracks, which are aligned parallel to the applied force. Coalescence of voids is believed to form these small cracks, which eventually interconnect along the interface between the sheared and unsheared regions to form a detrimental defect resulting in fracture.
- OSTI ID:
- 21361926
- Journal Information:
- Journal of Applied Physics, Vol. 106, Issue 10; Other Information: DOI: 10.1063/1.3259418; (c) 2009 American Institute of Physics; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hardness and shear band evolution in bulk metallic glasses after plastic deformation and annealing
Thermoplasticity of metallic glasses: Processing and applications