Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22669
Title: Instability of crack propagation in brittle bulk metallic glass
Authors: Wang, G
Chan, KC 
Xu, XH
Wang, WH
Keywords: Atomic force microscopy
Fracture
Metallic glasses
Scanning electron microscopy
Issue Date: 2008
Publisher: Pergamon-Elsevier Science Ltd
Source: Acta materialia, 2008, v. 56, no. 19, p. 5845-5860 How to cite?
Journal: Acta Materialia 
Abstract: The instability of the crack tip in brittle Mg-based bulk metallic glass (BMG) is studied. The formation of various fractographic surfaces of the BMG is associated with the instability of the fluid meniscus, which is due to viscous fluid matter being present on the fracture process zone. Depending on the values of the wavelength of the initial perturbation of the fluid meniscus and the local stress intensity factor, different fracture surface profiles, i.e. a dimple-like structure, a periodic corrugation pattern and a pure mirror zone are formed. The fractogaphic evolution is significantly affected by the applied stress. A decreased fracture surface roughness is observed under a low applied stress. An increased fracture surface roughness, which has frequently been reported by other researchers, is also observed in the present studies under a high applied stress. Unique fractographic features are attributed to the non-linear hyperelastic stiffening (or less softening) mechanism.
URI: http://hdl.handle.net/10397/22669
DOI: 10.1016/j.actamat.2008.08.005
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