THE 1962 HORACE W. GILLETT MEMORIAL LECTURE ON "PROGRESS IN UNDERSTANDING HIGH-TEMPERATURE CREEP"

Technical Report · Sun Jul 01 04:00:00 EDT 1962

OSTI ID:4732691

Dorn, J E

Progress to date in the understanding of high-temperature creep is discussed. A theory for the description of the component of creep arising from the thermally activated motion of jogged screw dislocations in pure metals, which agrees with the experimental facts at y from 92% to 6 one-half of the melting temperature, is explored. As creep continues, some dislocation sources become blocked as a result of the back-stress fields of interacting edge dislocations. Climb of such blocked dislocations can result in a second component of creep. Hence, both motion of jogged screw dislocations and the climb of edge dislocations contribute to total observed creep. The activation enthalpy for the motion of jogged screw dislocations is < the activation enthalpy for diffusion, but that for climb is slightly> that for self-diffusion. The mean value should approximate that for self-diffusion as is observed experimentally. (H.G.G.)

• Research Organization: California. Univ., Berkeley. Coll. of Engineering; and California. Univ., Berkeley. Lawrence Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-17-018677
• OSTI ID: 4732691
• Report Number(s): UCRL-10311
• Country of Publication: United States
• Language: English

Related Subjects

CREEP
DEFECTS
DIFFUSION
DISLOCATIONS
ENTHALPY
HIGH TEMPERATURE
IMPURITIES
MELTING POINTS
METALS
METALS, CERAMICS, AND OTHER MATERIALS
THERMODYNAMICS