Rheology of amorphous olivine thin films characterized by nanoindentation
(2021) Acta Materialia — Vol. 219, p. 117257 (2021)
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- Authors
Baral, Paul 
Orekhov, Andrey Dohmen, Ralf
- Abstract
- The rheological properties of amorphous olivine thin films deposited by pulsed laser deposition have been studied based on ambient temperature nanoindentation under constant strain-rate as well as re- laxation conditions. The amorphous olivine films exhibit a viscoelastic-viscoplastic behavior with a sig- nificant rate dependency. The strain-rate sensitivity m is equal to ∼0 . 05 which is very high for silicates, indicating a complex out-of-equilibrium structure. The minimum apparent activation volume determined from nanoindentation experiments corresponds to Mg and Fe atomic metallic sites in the (Mg,Fe) 2 SiO 4 crystalline lattice. The ambient temperature creep behavior of the amorphous olivine films differs very much from the one of single crystal olivine. This behavior directly connects to the recent demonstration of the activation of grain boundary sliding in polycrystalline olivine following grain boundary amorphiza- tion under high-stress.
- Affiliations
University of Antwerp EMAT Ruhr-University Bochum Institute of Geology, Mineralogy, and Geophysics Univ. Lille UMET Institut Universitaire de France
Citations
Baral, P., Orekhov, A., Dohmen, R., Coulombier, M., Raskin, J.-P., Cordier, P., Idrissi, H., & Pardoen, T. (2021). Rheology of amorphous olivine thin films characterized by nanoindentation. Acta Materialia, 219, 117257. https://doi.org/10.1016/j.actamat.2021.117257 (Original work published 2021)