THE EFFECT OF ENVIRONMENT ON THE MECHANICAL BEHAVIOR OF materials.

Abstract

The cyclic creep behavior of aluminum 7075-T6 and titanium (6Al/4V) was investigated in air and in vacuum. The cyclic creep decreased in vacuum. The kinetics for the relaxation of the surface layer stress in copper appear to follow a first-order reaction rate with respect to the surface layer stress. The apparent activation energy for the process is 3340 calories per mole. This low activation energy can be accounted for by a driving force imposed by the surface layer. The behavior of copper and titanium in media that cause stress corrosion cracking was investigated. These media caused the surface layer stress to increase appreciably. A tentative theory for stress corrosion is suggested. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1970
Accession Number
AD0701106

Entities

People

  • Irvin R. Kramer

Organizations

  • Martin Marietta

Tags

DTIC Thesaurus Topics

  • Aluminum
  • Corrosion
  • Energy
  • Environment
  • Heat Of Activation
  • Kinetics
  • Material Degradation Processes
  • Materials
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Titanium

Fields of Study

  • Materials science

Readers

  • Combustion science or combustion engineering.
  • Fluid Dynamics.
  • Mechanical Engineering/Mechanics of Materials.