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Elevated temperature, micro-compression transient plasticity tests on nanocrystalline Palladium-Gold: Probing activation parameters at the lower limit of crystallinity.
- Source :
-
Acta Materialia . May2017, Vol. 129, p124-137. 14p. - Publication Year :
- 2017
-
Abstract
- In this study, we probe the activation parameters and time-dependent plastic behavior of a nanocrystalline Palladium-Gold alloy by means of elevated temperature micropillar compression experiments. All tests were conducted on a stable, displacement-controlled in situ SEM indenter. A series of strain rate jump tests, where the strain rates were varied from 10 −4 s −1 up to 10 −2 s −1 , allowed us to extract strain rate sensitivity and average activation volumes in the order of 8 b 3 . Repeated load relaxation tests yielded lower activation volumes in the range of 4 b 3 . From the variation of test temperatures up to 125 °C, we extracted an apparent activation energy of ∼0.77 eV. The possible deformation mechanisms at such extremely small crystallite sizes are discussed within the framework of pertinent literature. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13596454
- Volume :
- 129
- Database :
- Academic Search Index
- Journal :
- Acta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 122291313
- Full Text :
- https://doi.org/10.1016/j.actamat.2017.02.045