|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermal and Mechanical Stability of Nanocrystalline Materials
||Insights from Variable Temperature and Ultra-high Strain Rate Nanomechanical Testing of Model Nanocrystalline and Nanocomposite Materials Realized by Either Inert Gas Condensation or Alternating Atomic Layer Deposition, Sputtering and Inert Gas Condensation of Nanoparticles
||Laszlo Petho, Rachel Schoeppner, Mikhail Polyakov, Juri Wehrs, Keith Thomas, Johann Michler
|On-Site Speaker (Planned)
We’ve extended the range of strain rates in in-situ SEM microcompression experiments up to 10^4 s−1. Experiments at temperatures as low as -150°C and up to 700°C have been achieved and several case studies were explored:
1) We investigated nanocrystalline Palladium-Gold alloy by means of variable temperature micropillar compression experiments and we extracted an apparent activation energy of ~0.77 eV. A series of strain rate jump tests allowed us to extract average activation volumes in the order of 8b3.
2) BCC magnesium in Mg-Nb PVD multilayers were studied and diffusion-based deformation mechanisms are clearly observed, with plastic deformation being accommodated by the growth of magnesium whiskers. Furthermore, the thickness of an ALD Al2O3 layer deposited between two magnetron sputtered Cu layers was varied from a few monolayers to several tens of nanometers to study potential dislocation transmission mechanisms. As alternative reinforcements, tungsten nanoparticles were incorporated into copper films via co-deposition.
||Planned: Supplemental Proceedings volume