Properties of a Retrogressed and Re-Aged 7075 Aluminum Alloy.

Abstract

Retrogression and Re-aging (RRA) is a new thermal process introduced for the purpose of enhancing corrosion resistance of 7075-T651 aluminum alloy while maintaining its T6 strength. In this study a 7075 material so treated was investigated for its mechanical and corrosion resistant properties. Results indicated that the RRA treated 7075 was significantly better than the T6 temper in resistance to stress corrosion cracking and exfoliation corrosion. The loss in strength from RRA treatment was minimal. Electron microscopy of the fractured surface showed a distinct difference in the fracture mode when compared to the T6 temper condition. Tests results indicated that the RRA heat treatment resulted in fatigue and fracture toughness properties superior to the 7075-T651. Keywords: SEM fractography, Differential scanning colorimetry, Hardness, Conductivity, Fracture toughness, Fatigue, and Crack propagation.

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Document Details

Document Type
Technical Report
Publication Date
Dec 31, 1984
Accession Number
ADA157415

Entities

People

  • C. E. Neu
  • E. S. Tankins
  • J. J. Bethke
  • V. S. Agarwala

Organizations

  • Naval Air Warfare Center Warminster

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Sensors

DTIC Thesaurus Topics

  • Aircrafts
  • Aluminum Alloys
  • Conductivity
  • Corrosion Resistance
  • Crystal Structure
  • Electrical Conductivity
  • Electron Microscopes
  • Fatigue Tests (Mechanics)
  • Grain Boundaries
  • Materials
  • Mechanical Properties
  • Mechanics
  • Plastic Explosives
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Tensile Properties
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials

Technology Areas

  • Microelectronics