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Creep substructure formation in sodium chloride single crystals in the power law and exponential creep regimesCreep tests conducted on NaCl single crystals in the temperature range from 373 to 1023 K show that true steady state creep is obtained only above 873 K when the ratio of the applied stress to the shear modulus is less than or equal to 0.0001. Under other stress and temperature conditions, corresponding to both power law and exponential creep, the creep rate decreases monotonically with increasing strain. The transition from power law to exponential creep is shown to be associated with increases in the dislocation density, the cell boundary width, and the aspect ratio of the subgrains along the primary slip planes. The relation between dislocation structure and creep behavior is also assessed.
Document ID
19900046275
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Raj, S. V.
(NASA Lewis Research Center Cleveland, OH, United States)
Pharr, G. M.
(Rice University Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Materials Science and Engineering, Part A - Structural Materials: Properties, Microstructure and Processing
Volume: A122
ISSN: 0921-5093
Subject Category
Solid-State Physics
Accession Number
90A33330
Funding Number(s)
CONTRACT_GRANT: NCC3-72
Distribution Limits
Public
Copyright
Other

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