title: Work-hardening induced tensile ductility of bulk metallic glasses via high-pressure torsion.
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.
authors.affiliation: Center for Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, South Korea.
authors.forename: Soo-Hyun
authors.initials: SH
authors.lastname: Joo
authors.affiliation: Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea.
authors.forename: Dong-Hai
authors.initials: DH
authors.lastname: Pi
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Albertus Deny Heri
authors.initials: AD
authors.lastname: Setyawan
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Hidemi
authors.initials: H
authors.lastname: Kato
authors.affiliation: Department of Metal Physics, Charles University, 121 16 Prague 2, Czech Republic.
authors.forename: Milos
authors.initials: M
authors.lastname: Janecek
authors.affiliation: Research Institute of Industrial Science &Technology, Pohang 790-600, South Korea.
authors.forename: Yong Chan
authors.initials: YC
authors.lastname: Kim
authors.affiliation: 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.
authors.forename: Sunghak
authors.initials: S
authors.lastname: Lee
authors.affiliation: 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.
authors.forename: Hyoung Seop
authors.initials: HS
authors.lastname: Kim