A Differential Scanning Calorimetry Study of Guinier Preston Zone Formation and Dissolution in 7075 and 7091 Aluminum Alloys.

Abstract

The aging behavior of P/M 7091 and IM 7075 aluminum were studied by DSC; also hardness and conductivity. The energy associated with the formation and dissolution of Guinier Preston zones is correlated to mechanical and physical properties; equations for conductivity and hardness as a function of heat of reaction are presented. The activation energy fo GP dissolution was established by differential scanning calorimetry (DSC) and values for delta H*, deltaG*, and deltaS* were calculated using absolute reaction rate theory. The activation energy calculated for GP disolution in 7075-T6 is equivalent to the activation energy reported for the diffusion of Zn in aluminum.

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Document Details

Document Type
Technical Report
Publication Date
Dec 30, 1985
Accession Number
ADA171881

Entities

People

  • William Frazier

Organizations

  • Naval Air Warfare Center Warminster

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alloys
  • Aluminum Alloys
  • Conductivity
  • Electrical Conductivity
  • Energy
  • Free Energy
  • Hardness
  • Heat Of Activation
  • Heat Of Reaction
  • Materials
  • Mechanical Properties
  • Physical Metallurgy
  • Physical Properties
  • Plastic Explosives
  • Precipitation
  • Regression Analysis
  • Standing Waves

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Molecular Photonics/Laser Physics
  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Space