Evolution of shear bands and fatigue striations in a bulk metallic glass during fatigue

G. Y. Wang, P. K. Liaw, Y. Yokoyama, A. Inoue

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Four-point-bend fatigue experiments are conducted on rectangular beam samples of a Zr 50Cu 37Al 10Pd 3 (in atomic percent) bulk metallic glass (BMG). In general, a fatigue crack initiates from the corner of the beam sample at the tensile stress surface and subsequently grows inside during cyclic loading. As a result, many shear bands form around the crack growth path due to the plastic deformation at the crack tip. Moreover, the size of the shear-band zone shows a good relationship with the stress intensity factor range, which is similar to the plastic zone in the crystalline alloys. Moreover, the shear-band spacing is consistent with the coarse fatigue striation spacing, which implies that the fatigue-crack growth in BMGs is related to the formation of shear bands. A reasonable mechanism is proposed to understand the fatigue-crack-growth behavior in BMGs.

Original languageEnglish
Pages (from-to)96-100
Number of pages5
JournalIntermetallics
Volume23
DOIs
Publication statusPublished - 2012 Apr 1

Keywords

  • B. Fatigue resistance and crack growth
  • B. Glasses, metallic
  • F. Mechanical testing

ASJC Scopus subject areas

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

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