Elevated temperature micropillar compression transient tests on nanocrystalline Palladium-Gold: Probing activation parameters at the lower limit of crystallinityTuesday (27.09.2016) 12:00 - 12:15 Part of:
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. The average crystallite size is approximately 10nm. A series of strain rate jump tests where the strain rates were varied from 10-5 s-1 up to 10-2 s-1 allowed to extract strain rate sensitivity and average activation volumes around 8 b3. Repeated load relaxation tests yield lower activation volumes in the range of 4b3. The variation of test temperatures up to 125 °C allowed calculating an activation energy of ~67 kJ/mol. All tests were conducted on a stable, displacement controlled in-situ SEM indenter.
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