THE EFFECT OF ENVIRONMENT ON THE MECHANICAL BEHAVIOR OF materials.
Annual rept. Jan-Dec 69,
MARTIN MARIETTA CORP DENVER COLO DENVER DIV
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The cyclic creep behavior of aluminum 7075-T6 and titanium 6Al4V 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
- Properties of Metals and Alloys