Please use this identifier to cite or link to this item:
Title: Cooperative shear and catastrophic fracture of bulk metallic glasses from a shear-band instability perspective
Authors: Zheng, H.
Li, Y. 
Issue Date: Dec-2009
Citation: Zheng, H., Li, Y. (2009-12). Cooperative shear and catastrophic fracture of bulk metallic glasses from a shear-band instability perspective. Journal of Materials Research 24 (12) : 3620-3627. ScholarBank@NUS Repository.
Abstract: The morphology of the fracture surfaces of a bulk metallic glass (BMG) tested under compression was systematically studied. Experimental results showed that the fracture surface always comprises two kinds of zones, starting with a relatively smooth zone followed by the second zone with vein patterns. It implies strongly that the plastic deformation of BMGs always starts with a cooperative shear. The following catastrophic fracture characterized by the vein patterns may or may not occur, depending on the magnitude of this shear, which is controlled by the sample size and machine stiffness. This phenomenon was interpreted based on the temperature rise resulting from the work done during the cooperative shear. It revealed that for small samples, the shear is so small that the temperature rise is insignificant, accounting for the extensive serrated flow, while the temperature rise in samples beyond a critical size is sufficiently high so that the temperatures in the shear band are higher than the glass transition temperature or even the melting temperature, leading to catastrophic fracture. © 2009 Materials Research Society.
Source Title: Journal of Materials Research
ISSN: 08842914
DOI: 10.1557/jmr.2009.0442
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Mar 25, 2019


checked on Mar 25, 2019

Page view(s)

checked on Mar 23, 2019

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.