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Elevated temperature micropillar compression transient tests on nanocrystalline Palladium-Gold: Probing activation parameters at the lower limit of crystallinity

Tuesday (27.09.2016)
12:00 - 12:15
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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.

Juri Wehrs
Swiss Federal Laboratories for Materials Science and Technology (EMPA)
Additional Authors:
  • Michael Johannes Deckarm
    Universität des Saarlandes
  • Jeffrey M. Wheeler
    ETH Zurich
  • Xavier Maeder
    Empa - Materials Science and Technology
  • Rainer Birringer
    Universität des Saarlandes
  • Johann Michler
    Empa - Materials Science and Technology


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