INFLUENCE OF CONSTITUENT PARTICLES ON FATIGUE CRACK PROPAGATION IN ALUMINUM ALLOYS,

Abstract

The fracture surfaces of two controlled chemistry 7178 aluminum alloys, containing a volume fraction of inclusions of 0.38% and 4.78%, were studied by electron microscopy. Local crack propagation in the matrix, as determined by measurement of spacing of crack arrest lines, was observed to be slower than the overall crack growth. This difference is shown to be due to extensive cracking of brittle second phase particles ahead of the main crack. The extent of this cracking is shown to depend on the size of the plastic zone at the crack tip and interparticle spacing. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1963
Accession Number
AD0423026

Entities

People

  • Regis M. N. Pelloux

Organizations

  • Boeing

Tags

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Chemistry
  • Crack Propagation
  • Crack Tips
  • Cracks
  • Electron Microscopy
  • Electrons
  • Inclusions
  • Measurement
  • Microscopy
  • Particles

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics
  • Space