Microcrack-enhanced creep in polycrystalline material at elevated temperature

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AuthorSearch for:
TypeArticle
Journal titleActa Metallurgica
ISSN0001-6160
Volume37
Issue11
Pages31073118; # of pages: 12
Subjectcreep; temperature; high degree; ice; microcrack; enhanced
AbstractA grain size dependent rheological model is presented for high temperature creep that is capable of predicting both primary and tertiary as well as secondary creep. Primary and tertiary creep rate are shown to be strongly influenced by grain size, whereas secondary or minimum creep rate is rather insensitive to it. During the primary creep stage creep rate increases with decreasing grain size, but the reverse is true in the tertiary or accelerating range. An increase in grain size also dictates decrease in the time to reach minimum creep rate concomitant with a decrease in strain. The model is based on intragranular dislocation creep enhanced by grain-facet size cracks produced during deformation by the embrittlement process that is caused by an intergranular sliding mechanism. Incorporation of the kinetics of microcracking activity is the foundation of the theory.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierIRC-P-1628
NRC number31061
1396
NPARC number20378499
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Record identifier34cbdf43-6d70-4ec9-bd79-554d2adcc31e
Record created2012-07-24
Record modified2016-05-09
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