Shear band formation and ductility in bulk metallic glass

• Published in: Philosophical magazine (Abingdon, England) Vol. 85; no. 23; pp. 2671 - 2687
• Main Authors: Sergueeva, A. V., Mara, N. A., Kuntz, J. D., Lavernia, E. J., Mukherjee, A. K.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis Group 11.08.2005; Taylor and Francis
• Subjects: Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Fatigue, brittleness, fracture, and cracks; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Deformation band; Metallic conduction; High strain; Deformation; Ruptures; Ductility; Mechanical properties; Tension compression fatigue test; Step; Metallic glasses; Fractures; Ambient temperature; Chemical composition; Shear band; Strain rate
• ISSN: 1478-6435; 1478-6443
• DOI: 10.1080/14786430500154059

The variations in the chemical compositions of the metallic glasses reported in the literature, as well as the overall lack of experimental data concerning the inhomogeneous deformation behaviour of metallic glass, make the evaluation of the effects of shear band/fracture behaviour on the mechanical properties of metallic glasses difficult. Isolating the effect of local shear band formation on bulk inhomogeneous flow would appear to be a first step in approaching this problem. The mechanical behaviour of Vitreloy metallic glass at room temperature and at various strain rates in tension and compression was investigated. The formation of multiple shear bands was observed at high strain rates. An increase in strain rate leads to enhanced ductility in tension and compression. Some aspects of the deformation processes in tension and compression are discussed.