A study on the surface severe plastic deformation behavior of a Zr-based bulk metallic glass (BMG)

J. W. Tian, L. L. Shaw, Y. D. Wang, Y. Yokoyama, P. K. Liaw

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

A surface treatment process, which can generate the severe plastic deformation in the near-surface layer of crystalline materials, is successfully applied on the Zr50Cu40Al10 bulk metallic glass (BMG). The experiment is implemented using 20 WC/Co balls with a velocity of about 5 m/s to bombard the surface of the samples in a purified argon atmosphere. The plastic-flow deformation in the unconstrained sample edge was observed, which exhibits the good intrinsic ductility of this material under the experimental condition. In the sub-surface layer, the bombardment-induced shear-band operations generate the extrusion and intrusion marks on the side face. Differential scanning calorimetry (DSC) shows that the free volumes of the deformed BMG have increased, and possible crystallization may occur during the process. X-ray diffraction (XRD) and synchrotron high-energy X-ray diffraction techniques were used to inspect the possible crystal phase. A nanoindentation test shows that on the side surface, the hardness increases and, then, decreases with the distance from the processed surface. Four-point-bending-fatigue behavior has been studied and related to the modified surface structure and the compressive residual stress introduced by the surface treatment.

Original languageEnglish
Pages (from-to)951-957
Number of pages7
JournalIntermetallics
Volume17
Issue number11
DOIs
Publication statusPublished - 2009 Nov
Externally publishedYes

Keywords

  • B. Brittleness and ductility
  • B. Fatigue resistance and crack growth
  • B. Glasses, metallic
  • B. Work-hardening
  • C. Nanocrystals

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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