Effect of High-Pressure Torsion on the Thermal and Mechanical Properties of La 62 Cu 12 Ni 12 Al 14 Bulk Metallic Glass

Jing Guo, Soo Hyun Joo, Donghai Pi, Wooyeol Kim, Yuepeng Song, Hyoung Seop Kim, Xiaohui Zhang, Dan Kong

Research output: Contribution to journalArticle

Abstract

Even though bulk metallic glasses (BMGs) are generally brittle, they receive large plastic deformations of over 1000% shear strain without fracturing through the application of combined shear and hydrostatic stresses. In this study, the effects of the severe plastic deformation by high-pressure torsion (HPT) on the thermal and mechanical properties of La 62 Cu 12 Ni 12 Al 14 BMG are investigated. Crystallization is not detected during the HPT processes with 5, 15, and 30 revolutions. However, increase in glass transition temperature, crystallization temperature, fracture strength, and fracture strain, and decrease in the coefficient of thermal expansion and hardness due to the HPT process are found. These changes in the properties are attributable to the increased free volume that results from the rejuvenated structure in the HPT-processed BMG. In addition, the fracture in the HPT-processed La 62 Cu 12 Ni 12 Al 14 BMG proceeds through a softening mechanism in the microscale region.

Original languageEnglish
Article number1800918
JournalAdvanced Engineering Materials
Volume21
Issue number3
DOIs
Publication statusPublished - 2019 Mar

Keywords

  • fracture
  • hardness
  • high-pressure torsion
  • thermal expansion

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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