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Olszta, Matthew
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Publications (6/6 displayed)
- 2024Optical Evidence of Compositional Fractioning between Plasma‐Condensed and Melt Pool Mattercitations
- 2023Modes of strain accommodation in Cu-Nb multilayered thin film on indentation and cyclic shearcitations
- 2023Understanding La<sub>2</sub>NiO<sub>4</sub>-La<sub>0.5</sub>Ce<sub>0.5</sub>O<sub>2</sub> Oxygen Electrode Phase Evolution in a Solid Oxide Electrolysis Cell
- 2022Heterogenous activation of dynamic recrystallization and twinning during friction stir processing of a Cu-4Nb alloycitations
- 2022Heterogenous activation of dynamic recrystallization and twinning during friction stir processing of a Cu-4Nb alloycitations
- 2021Multimodal analysis of spatially heterogeneous microstructural refinement and softening mechanisms in three-pass friction stir processed Al-4Si alloycitations
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article
Modes of strain accommodation in Cu-Nb multilayered thin film on indentation and cyclic shear
Abstract
<p>Two-phase layered thin films with a high density of semi-coherent interfaces exhibit excellent mechanical properties and thermal stability. In this study, a magnetron-sputtered Cu-Nb dual-layered thin film (∼500 nm for Cu and ∼150 nm for Nb) having an amorphous interface between Cu and Nb with a high density of aligned growth twins in Cu is subjected to severe surface deformation. The material is loaded using indentation and cyclic shear under tribological testing. The strain accommodation in the subsurface microstructure after deformation varies based on the local structure and deformation mode. Grain refinement and crack formations in the stressed region of the Nb layer and localized crystallization of the amorphous interface are observed after indentation and scratch testing. Pronounced detwinning of growth twins in the Cu layer under the cyclic shear strain leaves large dislocations sites and loops which are observed both by high-resolution transmission electron microscopy and experiment-guided molecular dynamic (MD) simulations. Our simulations provided insights into understanding the pathway for the detwinning process under cyclic shear loading. © 2023 Elsevier B.V. All rights reserved.</p>