Effects of anisotropy and slip geometry on fatigue fracture of Cu/sapphire bicrystals

Pedro Peralta, U. Ramamurty, S. Suresh, G. H. Campbell, W. E. King, T. E. Mitchell

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Interfacial fatigue cracks were propagated in Cu/sapphire bicrystals with effect of anisotropy and slip geometry in the fracture process. Compact tension specimens with two different crystallographic crack growth directions were loaded to ΔKla ≃ 2 Mpa m1/2 with R*0. Interfacial cracks grew preferentially along <110>Cu and less favorably along <001>Cu. Large areas of the copper fracture surface were relatively featureless for crack growth along <110>Cu, whereas well defined striations could be observed for the second direction. A refined elastic analysis of the anisotropic near-tip fields for the interfacial crack revealed that the preferential crack growth direction had the highest energy release rate and mode I crack tip opening displacement. The second direction corresponded to a minimum mode II mix. Similar correlations were found in other Cu/sapphire bicrystal experiments described in the literature. Dislocation nucleation from the interfacial crack tip is also analyzed.

Original languageEnglish (US)
Pages (from-to)55-66
Number of pages12
JournalMaterials Science and Engineering A
Volume314
Issue number1-2
DOIs
StatePublished - Sep 15 2001

Fingerprint

Bicrystals
bicrystals
Aluminum Oxide
Sapphire
Crack propagation
sapphire
Anisotropy
slip
cracks
Fatigue of materials
Crack tips
anisotropy
Geometry
geometry
Cracks
Energy release rate
crack tips
Dislocations (crystals)
Nucleation
Copper

Keywords

  • Anisotropy
  • Compact tension
  • Cu/sapphire bicrystal
  • Interfacial crack

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Effects of anisotropy and slip geometry on fatigue fracture of Cu/sapphire bicrystals. / Peralta, Pedro; Ramamurty, U.; Suresh, S.; Campbell, G. H.; King, W. E.; Mitchell, T. E.

In: Materials Science and Engineering A, Vol. 314, No. 1-2, 15.09.2001, p. 55-66.

Research output: Contribution to journalArticle

Peralta, Pedro ; Ramamurty, U. ; Suresh, S. ; Campbell, G. H. ; King, W. E. ; Mitchell, T. E. / Effects of anisotropy and slip geometry on fatigue fracture of Cu/sapphire bicrystals. In: Materials Science and Engineering A. 2001 ; Vol. 314, No. 1-2. pp. 55-66.
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