Sensitization of Naturally Aged Aluminum 5083 Armor Plate

Abstract

A sample of aluminum armor plate, approximately 40 to 50 years old, containing a large intergranular stress corrosion crack was evaluated. Scanning electron microscopy examination of the fracture surfaces is consistent with intergranular stress corrosion cracking and some evidence of variable environmental and stress history is noted. ASTM G-67 nitric acid mass-loss values were 19 to 25 mg/cm2. The transmission electron microscopy microstructure of the sample was found to be consistent with sensitization due to aging at low temperatures for a long time. The grain boundary magnesium-rich phase is continuous, although non-uniform, and only 10 to 15 nm thick.

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Document Details

Document Type
Technical Report
Publication Date
Jul 29, 2015
Accession Number
ADA622903

Entities

People

  • Peter S. Pao
  • Ramasis Goswami
  • Ronald L. Holtz

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Armor Plate
  • Boundaries
  • Corrosion
  • Crack Tips
  • Cracks
  • Electron Microscopy
  • Grain Boundaries
  • Materials
  • Materials Science
  • Military Research
  • Solid Solutions
  • Stress Corrosion
  • Test Methods
  • Transmission Electron Microscopy

Fields of Study

  • Materials science

Readers

  • Structural Health Monitoring of Composite Structures.
  • Thin Film Deposition Science.
  • ballistics.

Technology Areas

  • Microelectronics