Effects of pre-compression deformation on nanoindentation response of Zr65Cu15Al10Ni10 bulk metallic glass

Hu Huang, Jiliang Zhang, Chan Hung Shek, Jiwang Yan

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13 Citations (Scopus)

Abstract

Nanoindentation experiments were conducted on Zr65Cu15Al10Ni10 bulk metallic glass samples with pre-compression deformation (PCD) under various conditions. By analyzing indentation hardness, residual morphology, pile-up, and serrated flow, the effects of PCD on nanoindentation response were comparatively investigated. Experimental results indicate that 9 kN PCD induced remarkable decrease of indentation hardness, i.e. softening of the material, while for the 18 kN and 25 kN PCD samples, hardness values very close to that of the as cast sample were obtained. Furthermore, PCD also changed the mechanical heterogeneity, i.e., distribution of soft and hard regions in the bulk metallic glass. Residual morphologies and load-displacement curves of the 9 kN and 18 kN PCD samples showed opposite features in aspects of macroscopic shear bands, pile-up width, pile-up height, and serrated flows, suggesting different plastic flows during nanoindentation. To rationalize these phenomena, a competing mechanism between shear bands and compressive residual stress was discussed.

Original languageEnglish
Pages (from-to)223-228
Number of pages6
JournalJournal of Alloys and Compounds
Volume674
DOIs
Publication statusPublished - 2016 Jul 25

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Keywords

  • Bulk metallic glass
  • Mechanical heterogeneity
  • Nanoindentation
  • Pre-compression deformation
  • Serrated flow
  • Shear band

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

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