Plasticity enhancement of a Zr-based bulk metallic glass by an electroplated Cu/Ni bilayered coating

W. Chen, Kang Cheung Chan, S. H. Chen, S. F. Guo, W. H. Li, G. Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

36 Citations (Scopus)

Abstract

In this study, the effect of a Cu/Ni bilayered coating on the shear banding behavior and compressive plasticity of a Zr-based bulk metallic glass (BMG) was investigated. As compared to a mono-layered Cu or Ni coating, the Cu/Ni bilayered coating has provided a better geometric confinement effect. Through a detailed comparative analysis among coated BMG samples with different plasticity, the correlation between the macroscopic plastic deformation behavior and the serrated flow characteristics is studied from the potential energy landscape point of view. The comparatively longer hanging time and larger elastic energy density in the Cu/Ni coated BMG in the serrated plastic regime result in an increased global plastic strain of ∼11.2%. The enhanced plasticity is attributed to the thin soft Cu layer acting as a buffer zone for absorbing the elastic energy upon loading, and the strong outer Ni coating exerting a high confining stress upon loading, which impede the rapid propagation of the shear bands. In addition, the strong Cu-Ni interface is believed to contribute to the enhanced plasticity.
Original languageEnglish
Pages (from-to)199-203
Number of pages5
JournalMaterials Science and Engineering A
Volume552
DOIs
Publication statusPublished - 30 Aug 2012

Keywords

  • Bulk metallic glass
  • Cu/Ni bilayered coating
  • Electroplating
  • Mechanical properties
  • Shear bands

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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