Fracture morphology pattern transition dominated by the crack tip curvature radius in brittle metallic glasses

The dynamic evolutions of different fracture morphologies in the fracture surface of brittle Mg-based metallic glasses (MGs) were systematically and quantitatively studied by SEM and AFM. It shows that the evolution of the fracture morphology pattern is dominated by an effective dynamic parameter of...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-11, Vol.617, p.89-96
Main Authors: Gao, M., Ding, D.W., Zhao, D.Q., Bai, H.Y., Wang, W.H.
Format: Article
Language:English
Subjects:
Applied sciences
Brittle fracture
Crack tip curvature radius
Cross-disciplinary physics: materials science
rheology
Curvature
Ductile brittle transition
Evolution
Exact sciences and technology
Fracture mechanics
Fracture morphology evolution
Fractures
Glasses (including metallic glasses)
Materials science
Mathematical analysis
Mathematical models
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metallic glasses
Metals. Metallurgy
Morphology
Physics
Shear transformation zone
Specific materials
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Summary:The dynamic evolutions of different fracture morphologies in the fracture surface of brittle Mg-based metallic glasses (MGs) were systematically and quantitatively studied by SEM and AFM. It shows that the evolution of the fracture morphology pattern is dominated by an effective dynamic parameter of critical crack tip curvature radius. Based on crack tip plastic zone and shear transformation zone (STZ) theories, a theoretical model for the evolution of the crack tip curvature radius by considering the activation of STZs during fracture was proposed. The model can simulate the crack propagation process, and predict the critical crack tip curvature radius and the fracture pattern transition between the dimples and the periodic corrugations solely occurring in brittle MGs. These results have implications for understanding the microscopic fracture mechanism and the structural origin of fracture in MGs.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.08.060