Enhanced toughness due to stable crack tip damage zones in bulk metallic glass
Bulk metallic glass alloys exhibit an impressive range of mechanical properties including large elastic strains to failure ({epsilon}{sub el} {approximately} 2{degree}) and high tensile strengths ({approximately}2 GPa). This paper describes the fracture behavior of a Zr{sub 41.25}Ti{sub 13.75}Ni{sub 10}Cu{sub 12.5}Be{sub 22.5} bulk metallic glass observed using a single edge notched fracture sample loaded in tension (SEN(T)). Fracture toughness values in excess of 130 MPa{radical}m were found. These high values are associated with significant crack tip plastic deformation and blunting. Localized shear bands and branched cracks form an energy dissipating damage zone at the crack tip. Surprisingly, the extent of the damage zone is less than that expected for a polycrystalline metallic material with similar yield strength and toughness.
- Research Organization:
- Stanford Univ., CA (US)
- OSTI ID:
- 20000417
- Journal Information:
- Scripta Materialia, Vol. 41, Issue 9; Other Information: PBD: 8 Oct 1999; ISSN 1359-6462
- Country of Publication:
- United States
- Language:
- English
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