Journal
INTERMETALLICS
Volume 9, Issue 12, Pages 1053-1061Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0966-9795(01)00108-X
Keywords
nickel aluminides, based on Ni3Al; creep; mechanical properties at ambient temperatures; plastic deformation mechanisms
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Incremental creep tests have been used to explore the time-dependent plastic behavior of single-slip oriented Ni-3(Al, Ta) at low temperatures in the anomalous flow regime. For selected incremental creep experiments at 20 and 100 degreesC, it was discovered that Ni3Al exhibited sigmoidal creep, where there is a significant time delay before the plastic strain rate accelerates to a maximum value during a creep experiment. Several of the factors that affect the sigmoidal creep response have been identified. The origin of sigmoidal creep is accounted for using a simple model of work hardening in Ni3Al, where the acceleration of the creep rate is a direct result of the annihilation of the existing dislocation substructure. Published by Elsevier Science Ltd.
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