14 Citations (Scopus)

Abstract

The fatigue behavior of aluminum alloys is greatly influenced by the environmental conditions. In this article, fatigue crack growth rates were measured for 7075-T651 Al alloy under ultrahigh vacuum (UHV, ~10-10 Torr), dry air, and water vapor. Standard compact tension (CT) specimens were tested along the L-T orientation under various load ratios of 0.1, 0.5, and 0.8. Fracture surfaces and crack morphologies were studied using scanning electron microscopy and crack deflection analysis. The crack growth behavior under vacuum was affected by friction and possible rewelding of crack surfaces, causing an asymmetry in the crack growth behavior, from load shedding to constant load. The enhancement of crack growth at higher moisture levels was observed and is discussed in terms of moisture decreasing friction between the crack faces. The effect of crack deflection as a function of R ratio and environment is also presented.

Original languageEnglish (US)
Pages (from-to)2799-2809
Number of pages11
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume43
Issue number8
DOIs
StatePublished - Aug 2012

Fingerprint

Fatigue crack propagation
aluminum alloys
Environmental impact
Aluminum alloys
cracks
Cracks
Crack propagation
Moisture
Friction
moisture
Steam
Ultrahigh vacuum
deflection
friction
Water vapor
surface cracks
Fatigue of materials
Vacuum
Scanning electron microscopy
ultrahigh vacuum

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials

Cite this

Environmental effects on fatigue crack growth in 7075 aluminum alloy. / Bonakdar, A.; Wang, F.; Williams, J. J.; Chawla, Nikhilesh.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 43, No. 8, 08.2012, p. 2799-2809.

Research output: Contribution to journalArticle

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