Stress Corrosion Cracking Properties of Two Aluminum-Magnesium Alloys.

Abstract

The SCC behavior of two Alcoa Al-Mg alloys -- a commercial alloy, 5456-H117, and an experimental alloy, N-H117, is described. These materials were studied in the as-received and aged conditions for susceptibility to cracking in 3.5% NaCl solution. Double cantilever beam specimens were machined from the one-inch thick plates of the two alloys in the SL, TL, and LT orientations. All of the specimens were fatigue pre-cracked to facilitate initiation of a 'pop-in' crack when bolt loaded to start the SCC tests. After three days immersion in the corrodent, the specimens were mechanically broken apart and the fracture surface examined for visual evidence of SCC. The as-received specimens were insensitive to SCC in these tests with the exception of one N-H117 specimen. All of the aged specimens of both alloys were susceptible to SCC. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1974
Accession Number
AD0774496

Entities

People

  • C. T. Fujii
  • F. D. Bogar

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Cantilever Beams
  • Corrosion
  • Cracks
  • Magnesium
  • Magnesium Alloys
  • Material Degradation Processes
  • Materials
  • Orientation (Direction)
  • Stress Corrosion
  • Stress Corrosion Cracking

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Materials Science and Engineering.