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Introducing a strain-hardening capability to improve the ductility of bulk metallic glasses via severe plastic deformation

Introducing a strain-hardening capability to improve the ductility of bulk metallic glasses via severe plastic deformation
Introducing a strain-hardening capability to improve the ductility of bulk metallic glasses via severe plastic deformation
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
bulk metallic glasses, ductility, severe plastic deformation, transmission electron microscopy
1359-6454
253-260
Wang, Y.B.
30d7b540-dc88-4382-867a-28d0354a8495
Qu, D.D.
7ae8f2b3-eafd-4ea8-bea6-7e03aa869c49
Wang, X.H.
d8f33be8-3a1a-4789-ba51-d38fd6eec279
Cao, Y.
2a06c7de-86c5-4804-ab45-20266cbea4cf
Liao, X.Z.
f0645a6d-aee1-4d28-aa13-f1b00fdedc41
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Ringer, S.P.
2b986d4b-e93c-4801-9a1b-b16b39c30242
Shan, Z.W.
653e6c83-8aa2-4ede-a543-5ee91023eebf
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shen, J.
601ebb7f-9cc1-4a02-b23c-22e7521ae982
Wang, Y.B.
30d7b540-dc88-4382-867a-28d0354a8495
Qu, D.D.
7ae8f2b3-eafd-4ea8-bea6-7e03aa869c49
Wang, X.H.
d8f33be8-3a1a-4789-ba51-d38fd6eec279
Cao, Y.
2a06c7de-86c5-4804-ab45-20266cbea4cf
Liao, X.Z.
f0645a6d-aee1-4d28-aa13-f1b00fdedc41
Kawasaki, M.
d0ce18b9-8403-4db2-9cb2-3a6165f288a6
Ringer, S.P.
2b986d4b-e93c-4801-9a1b-b16b39c30242
Shan, Z.W.
653e6c83-8aa2-4ede-a543-5ee91023eebf
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shen, J.
601ebb7f-9cc1-4a02-b23c-22e7521ae982

Wang, Y.B., Qu, D.D., Wang, X.H., Cao, Y., Liao, X.Z., Kawasaki, M., Ringer, S.P., Shan, Z.W., Langdon, T.G. and Shen, J. (2012) Introducing a strain-hardening capability to improve the ductility of bulk metallic glasses via severe plastic deformation. Acta Materialia, 60 (1), 253-260. (doi:10.1016/j.actamat.2011.09.026).

Record type: Article

Abstract

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

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More information

e-pub ahead of print date: 29 October 2011
Published date: January 2012
Keywords: bulk metallic glasses, ductility, severe plastic deformation, transmission electron microscopy
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 335454
URI: http://eprints.soton.ac.uk/id/eprint/335454
ISSN: 1359-6454
PURE UUID: 6b189729-c82a-429f-936d-b41ad1c4f1ea
ORCID for T.G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 27 Apr 2012 13:38
Last modified: 15 Mar 2024 03:13

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Contributors

Author: Y.B. Wang
Author: D.D. Qu
Author: X.H. Wang
Author: Y. Cao
Author: X.Z. Liao
Author: M. Kawasaki
Author: S.P. Ringer
Author: Z.W. Shan
Author: T.G. Langdon ORCID iD
Author: J. Shen

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