Journal
ACTA MATERIALIA
Volume 60, Issue 1, Pages 253-260Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.09.026
Keywords
Bulk metallic glasses; Ductility; Severe plastic deformation; Transmission electron microscopy
Funding
- Australian Research Council
- National Science Foundation of the United States [DMR-0855009]
- European Research Council under ERC [267464-SPD-METALS]
- NSFC [50925104]
- 973 program of China [2010CB631003]
- Australian Microscopy AMP
- Microanalysis Research Facility node at the University of Sydney
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The great technological potential for bulk metallic glasses (BMGs) arises primarily because of their superior mechanical properties. To realize this potential, it is essential to overcome the severe ductility limitations of BMGs which are generally attributed to shear localization and strain softening. Despite much international effort, progress in improving the ductility of BMGs has been limited to certain alloys with specific compositions. Here, we report that severe plastic deformation of a quasi-constrained volume, which prevents brittle materials from fracture during the plastic deformation, can be used to induce strain hardening and to reduce shear localization in BMGs, thereby giving a significant enhancement in their ductility. Structural characterizations reveal the increased free volume and nanoscale heterogeneity induced by severe plastic deformation are responsible for the improved ductility. This finding opens a new and important pathway towards enhanced ductility of BMGs. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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