INVESTIGATION OF THE MECHANISM OF STRESS CORROSION OF ALUMINUM ALLOYS

Abstract

The results suggest three stages in the stress corrosion process with the rate of penetration of corrosion or cracking increasing with each succeeding stage. In the first stage, stress corrosion takes place independently of stress, that is, it follows the same course as the general corrosion of an unstressed specimen; for the alloys investigated this general corrosion occurred as random pitting. In the second stage, the attack becomes intergranular (if not already of this type) and directional, and it leads to the development of cracks of a microscopic size, or larger; these are the secondary cracks frequently seen in specimens that fail by stress-corrosion cracking. The third stage initiates whenever one of the intergranular cracks developed in the second state progresses far enough for the yield strength of the specimen to be reached; and it continues to the point of tensile failure.

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Document Details

Document Type
Technical Report
Publication Date
Feb 16, 1966
Accession Number
AD0633767

Entities

People

  • J. Mchardy

Organizations

  • Alcoa

Tags

Communities of Interest

  • Advanced Electronics
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acids
  • Aluminum Alloys
  • Cathodic Protection
  • Chemistry
  • Chromium
  • Corrosion
  • Crack Propagation
  • Cracks
  • Current Density
  • Heat Treatment
  • Materials
  • Particles
  • Resistance
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Tensile Strength
  • Yield Strength

Readers

  • Materials Science and Engineering.
  • Systems Analysis and Design