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Record Details

Record 5 of 13438
Stress versus temperature dependence of activation energies for creep
Author and Affiliation:
Freed, A. D.(NASA Lewis Research Center, Cleveland, OH, United States)
Raj, S. V.(NASA Lewis Research Center, Cleveland, OH, United States)
Walker, K. P.(Engineering Science Software, Inc., Smithfield, RI, United States)
Abstract: The activation energy for creep at low stresses and elevated temperatures is associated with lattice diffusion, where the rate controlling mechanism for deformation is dislocation climb. At higher stresses and intermediate temperatures, the rate controlling mechanism changes from dislocation climb to obstacle-controlled dislocation glide. Along with this change in deformation mechanism occurs a change in the activation energy. When the rate controlling mechanism for deformation is obstacle-controlled dislocation glide, it is shown that a temperature-dependent Gibbs free energy does better than a stress-dependent Gibbs free energy in correlating steady-state creep data for both copper and LiF-22mol percent CaF2 hypereutectic salt.
Publication Date: Jan 01, 1992
Document ID:
19920042095
(Acquired Nov 22, 1995)
Accession Number: 92A24719
Subject Category: STRUCTURAL MECHANICS
Document Type: Journal Article
Publication Information: ASME, Transactions, Journal of Engineering Materials and Technology (ISSN 0094-4289); 114; 46-50
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
Description: 5p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACTIVATION ENERGY; GIBBS FREE ENERGY; HIGH TEMPERATURE TESTS; STEADY STATE CREEP; STRESS ANALYSIS; CALCIUM FLUORIDES; COPPER; LITHIUM FLUORIDES; TEMPERATURE DEPENDENCE
Imprint And Other Notes: ASME, Transactions, Journal of Engineering Materials and Technology (ISSN 0094-4289), vol. 114, Jan. 1992, p. 46-50.
Availability Source: Other Sources
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