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Sci Rep. 2015 Apr 23;5:9660. doi: 10.1038/srep09660.

Work-hardening induced tensile ductility of bulk metallic glasses via high-pressure torsion.

Author information

1
Center for Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, South Korea.
2
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea.
3
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
4
Department of Metal Physics, Charles University, 121 16 Prague 2, Czech Republic.
5
Research Institute of Industrial Science &Technology, Pohang 790-600, South Korea.
6
1] Center for Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, South Korea [2] Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea.

Abstract

The mechanical properties of engineering materials are key for ensuring safety and reliability. However, the plastic deformation of BMGs is confined to narrow regions in shear bands, which usually result in limited ductilities and catastrophic failures at low homologous temperatures. The quasi-brittle failure and lack of tensile ductility undercut the potential applications of BMGs. In this report, we present clear tensile ductility in a Zr-based BMG via a high-pressure torsion (HPT) process. Enhanced tensile ductility and work-hardening behavior after the HPT process were investigated, focusing on the microstructure, particularly the changed free volume, which affects deformation mechanisms (i.e., initiation, propagation, and obstruction of shear bands). Our results provide insights into the basic functions of hydrostatic pressure and shear strain in the microstructure and mechanical properties of HPT-processed BMGs.

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