Analysis of Thermal Treatments for the 7075 & 7091 Aluminum Alloys.

Abstract

Retrogression and re-aging (RRA) is a thermal treatment applied to 7000 series aluminum alloys in order to improve their stress corrosion cracking resistance while maintaining the peak strength of the T-6 temper. In the present work, 7075 and 7091 were retrogressed at temperatures between 160 C and 240 C and aged for 24 hours at 120 C. The hardness and conductivity data obtained were compared to and contrasted with the alloy's normal aging profile. Results indicate that RRA treatment is effective at retrogression temperatures lower than previously reported and that retrogression appears to be kinetically dominated (i.e. data fits a first order dissolution model). The aforementioned results should enable the RRA process to be expanded to thick plates.

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Document Details

Document Type
Technical Report
Publication Date
Mar 15, 1984
Accession Number
ADA173722

Entities

People

  • E. S. Tankins
  • M. O'dowd
  • W. Frazier

Organizations

  • Naval Air Warfare Center Warminster

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Aircrafts
  • Alloys
  • Aluminum Alloys
  • Conductivity
  • Electrical Conductivity
  • Hardness
  • Heat Treatment
  • Materials
  • Particles
  • Physical Properties
  • Precipitation
  • Standards
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Tensile Properties
  • Test Methods
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Computational Modeling and Simulation
  • Materials Science and Engineering.