Madge, S V and Louzguine, D V and Lewandowski, J J and Greer , A L (2012) Toughness, extrinsic eﬀects and Poisson’s ratio of bulk metallic glasses. Acta Materialia, 60 . pp. 4800-4809.
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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 (m). The ﬁndings show that mode II toughness increases with m, though gradually, instead of an abrupt transition occurring at a critical value of m. Certain glassy alloys are profoundly brittle, irrespective of m, and this seems to be related to alloy chemistry. 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
|Uncontrolled Keywords:||Bulk metallic glasses; Toughness; Poisson’s ratio; Extrinsic eﬀects; Oxygen embrittlement|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr S. V. Madge|
|Deposited On:||10 Oct 2012 13:23|
|Last Modified:||10 Oct 2012 13:23|
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