Work-Hardening Induced Tensile Ductility of Bulk Metallic Glasses via High-Pressure Torsion

Soo Hyun Joo, Dong Hai Pi, Albertus Deny Heri Setyawan, Hidemi Kato, Milos Janecek, Yong Chan Kim, Sunghak Lee, Hyoung Seop Kim

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

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.

Original languageEnglish
Article number9660
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Apr 24

ASJC Scopus subject areas

  • General

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