Toughness, extrinsic effects and Poisson’s ratio of bulk metallic glasses

A range of bulk metallic glasses has been cast and their mode II fracture toughness has been estimated from the length scale of shear band vein patterns on fracture surfaces. As-cast rare-earth and Mg-based bulk metallic glasses invariably consist of oxide particles dispersed in a glassy matrix and...

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Bibliographic Details
Published in:Acta materialia 2012-07, Vol.60 (12), p.4800-4809
Main Authors: Madge, S.V., Louzguine-Luzgin, D.V., Lewandowski, J.J., Greer, A.L.
Format: Article
Language:English
Subjects:
Applied sciences
Bulk metallic glasses
Exact sciences and technology
Extrinsic effects
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Oxygen embrittlement
Poisson’s ratio
Toughness
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Summary:A range of bulk metallic glasses has been cast and their mode II fracture toughness has been estimated from the length scale of shear band vein patterns on fracture surfaces. As-cast rare-earth and Mg-based bulk metallic glasses invariably consist of oxide particles dispersed in a glassy matrix and the apparent brittleness of these alloys is partly extrinsic in nature, caused by these inclusions. The intrinsic toughness of these glasses is higher than previous reports suggest. An attempt has been made to correlate the toughness of a variety of glassy alloys, including La- and Mg-based systems, with their Poisson’s ratio (ν). The findings show that mode II toughness increases with ν, though gradually, instead of an abrupt transition occurring at a critical value of ν. Certain glassy alloys are profoundly brittle, irrespective of ν, and this seems to be related to alloy chemistry.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2012.05.025