Fatigue deformation of silver single crystals: STM evidence for crack nucleation, measurements of slip irreversibility and verification of a new scaling relationship for fatigue life

T. S. Sriram*, Chin Ming Ke, Y. W. Chung

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Silver single crystals oriented in the single glide orientation were fatigued in air and vacuum. The surface morphology was observed using a scanning tunneling microscope. A gold film deposited on the silver surface was used as a reference marker so that the same region can be observed upon repeated fatigue cycling. Pit-shaped features were observed to form within a narrow range of cycles and to eventually develop into micro-sized cracks, lending support to the notion that cracks are formed by a nucleation process. In addition, by measuring the slip band height and spacing as a function of cycling, we were able to determine the slip irreversibility and the Coffin-Manson exponents in both environments. With these two sets of data, we were able to verify a new scaling relationship for fatigue life based on our earlier theoretical work.

Original languageEnglish (US)
Pages (from-to)2515-2521
Number of pages7
JournalActa Metallurgica Et Materialia
Volume41
Issue number8
DOIs
StatePublished - Aug 1993

ASJC Scopus subject areas

  • Engineering(all)

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