The Delayed Fracture of Aluminum Alloys, End of Year Report.

Abstract

The mechanisms of failure of high-strength aluminum alloys in saline environments was investigated. It was found that the mechanism of stress corrosion cracking (SCC) in a commercial Al-Mg alloy, 5083, is dominated by hydrogen embrittlement (HE). The dominant contribution of HE was discerned by comparing SCC susceptibility under Modes I and III loading. The influence of the surface oxide film on the SCC susceptibility of 7075 and 7175 alloys was also examined. It was found that unlike certain high purity alloys, the susceptibility of these commercial alloys is not significantly influenced by the composition of the oxide. In these 7xxx alloys, the insoluble constituent particles provide sites for SCC initiation. The greater susceptibility of 7075, compared with its higher purity version, 7175, is in part a result of its lower value fraction of the constituent particles. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1982
Accession Number
ADA115693

Entities

People

  • David Venables
  • Guy D. Davis
  • Jonathan R. Gordon
  • Joseph R. Pickens

Organizations

  • Martin Marietta

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Aluminum Alloys
  • Auger Electron Spectroscopy
  • Auger Electrons
  • Crack Tips
  • Diffraction
  • Electron Spectroscopy
  • Heat Treatment
  • Hydrogen Embrittlement
  • Materials
  • Mechanics
  • Oxide Films
  • Solid Solutions
  • Solution Heat Treatment
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Tensile Strength
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Powder metallurgy of Titanium alloys.
  • Surface Engineering/Surface Coating Technology.