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Mechanically tunable dual-component polyolefin fiber mats via two-dimensional multilayer coextrusion
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Solar absorbent, dense, and self-healing ZrB 2 -SiC anti-oxidative multilayer coating for Carbon/Carbon composites
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Influence of composition and multilayer architecture on electrical conductivity of high temperature Pt-alloy films
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Modes of strain accommodation in Cu-Nb multilayered thin film on indentation and cyclic shear
Two-phase layered thin films with a high density of semi-coherent interfaces exhibit excellent mechanical properties and thermal stability. Here, 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.
Indentation Behavior of Multilayered Thin Films: Effects of Layer Undulation.
Abstract not provided.
Direct observations of confined layer slip in cu/Nb multilayers
Abstract Not Provided
Investigation of Helium Behavior in Multilayered Hydride Structures Through In-situ TEM Ion Implantation.
Abstract not provided.
Evolution and Reversible Polarity of Multilayering at the Ionic Liquid/Water Interface
Abstract not provided
A-Site Cation Substitutions in Strained Y-Doped BaZrO 3 Multilayer Films Leading to Fast Proton Transport Pathways
Proton-conducting perovskite oxides form a class of solid electrolytes for novel electrochemical devices operating at moderate temperatures. Here, we use hard X-ray photoelectron spectroscopy, scanning transmission electron microscopy, and density functional theory calculations to investigate the structure and elucidate the origin of the fast proton transport properties of strained ultrathin films of Y-doped BaZrO 3 grown by pulsed lased deposition on NdGaO 3 . Our study shows that our BaZr 0.8 Y 0.2 O 3 films incorporate a significant amount of Y dopants, and to a lesser extent also Zr ions, substituting for Ba 2+ , and that these substitutional defects agglomerate forming columnar regions crossing vertically from the surface to the interface the entire film. In conclusion, our calculations also show that, in regions rich in Y substitutions for both Zr and Ba, the proton transfer process involves nearly zero-energy barriers, indicating that A-site cation substitutions by Y lead to fast transport pathways and hence are responsible for the previously observed enhanced values of the proton conductivity of these perovskite oxide films.
Insight into the Phase Transformation Pathways of Copper Oxidation: from Oxygen Chemisorption on the Clean Surface to Multi-Layer Bulk Oxide Growth
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