Atomistically Informed and Dislocation-Based Viscoplasticity Model for Multilayer Composite Thin Films

2019 ◽  
Vol 141 (2) ◽  
Author(s):  
Mohsen Damadam ◽  
Mohammed Anazi ◽  
Georges Ayoub ◽  
Hussein Zbib
Keyword(s):  
Thin Films ◽  
Deformation Behavior ◽  
High Strength ◽  
Multiscale Model ◽  
Md Simulations ◽  
Mechanical And Thermal Properties ◽  
Multilayer Composite ◽  
Composite Thin Films ◽  
Thin Film Composites ◽  
Film Composites

Nano-scale multilayer composite thin films are potential candidates for coating applications at harsh environments due to their promising mechanical and thermal properties. In this study, a viscoplasticity continuum model based on the plastic flow potential of metal/ceramic nanolayer composites, obtained from molecular dynamics (MD) simulations, is developed to build up a multiscale model bridges atomistic simulation with continuum models for the thin film composites. The model adopts a power law hardening considering confined layer slip (CLS) mechanism and accounts for the evolution of dislocation density based on the statistically stored dislocations and geometrically necessary dislocations. It is then implemented into a finite element code (ls-dyna) to investigate the deformation behavior of nanolayer composites at the macroscale. The deformation behavior of a high strength steel coated with Nb/NbC multilayer is also examined.

scholarly journals Optical Properties of Titania-Cobalt Nitrate Composite Thin Films

1996 ◽  
Vol 5 (6) ◽  
pp. 096369359600500
Author(s):  
F. Pacheco ◽  
R. Palomino ◽  
G. Martínez ◽  
A. Mendoza-Galván ◽  
R. Rodriguez ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Sol Gel ◽  
Cobalt Nitrate ◽  
Experimental Conditions ◽  
Ellipsometric Characterization ◽  
Titania Films ◽  
Doped Titania ◽  
Thin Film Composites ◽  
Film Composites

Optical properties of titania thin films supported on silica plates and compounded with varying amounts of Co(II) from cobalt nitrate are reported. The ellipsometric characterization allows to model the spatial micro-structure of these thin film composites. The titania films were produced by the sol-gel method at room temperature and their thicknesses can be controlled by modifying the experimental conditions. The refractive index of the doped titania films was also determined by using ellipsometry.

Properties of Metal-Fullerene Composites

2019 ◽  
Vol 288 ◽  
pp. 124-129
Author(s):  
E.M. Shpilevsky ◽  
Serguei A. Filatov ◽  
Goliminsee Shilagardi ◽  
Duger Ulam-Orgikh ◽  
Perenlei Tuvshintur ◽  
...  
Keyword(s):  
Thin Films ◽  
Wear Resistance ◽  
Tribological Properties ◽  
High Wear Resistance ◽  
Low Friction ◽  
Composite Thin Films ◽  
Friction Coefficients ◽  
Film Composites

The results of investigation of mechanical, electrical, thermoelectric and tribological properties of metal-fullerene film composites of Ni-C60and Ti-C60systems is presented. It has been found that doping of metals with fullerenes leads to a significant increase in the strength of the material, and a change in the electrical, optical, and other properties of the material. It is established that metal-fullerene films are characterized by low friction coefficients and high wear resistance. It is experimentally shown that metal-fullerene composite thin films possess a capacitive impedance, that the thermopower of Ti-C60coatings reaches the value of 30 μV/K depending on the Ti/C60ratio.

scholarly journals Synthesis and Properties of High Strength Thin Film Composites of Poly(ethylene Oxide) and PEO-PMMA Blend with Cetylpyridinium Chloride Modified Clay

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Mohammad Saleem Khan ◽  
Sabiha Sultana
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Ethylene Oxide ◽  
Cetylpyridinium Chloride ◽  
High Strength ◽  
Poly Ethylene Oxide ◽  
Ion Conducting ◽  
Poly Ethylene ◽  
Thin Film Composites ◽  
Film Composites

Ion-conducting thin film composites of polymer electrolytes were prepared by mixing high MW poly(ethylene oxide) (PEO), poly(methyl methacrylate) (PMMA) as a polymer matrix, cetylpyridinium chloride (CPC) modified MMT as filler, and different content of LiClO4by using solution cast method. The crystallinity, ionic conductivity (σ), and mechanical properties of the composite electrolytes and blend composites were evaluated by using XRD, AC impedance, and UTM studies, respectively. The modification of clay by CPC showed enhancement in thed-spacing. The loading of clay has effect on crystallinity of PEO systems. Blend composites showed better mechanical properties. Young’s modulus and elongation at break values showed increase with salt and clay incorporation in pure PEO. The optimum composition composite of PEO with 3.5 wt% of salt and 3.3 wt% of CPMMT exhibited better performance.

Synthesis and Characterization of Metal-Ceramic Thin Film Nanocomposites With Improved Mechanical Properties

2002 ◽  
Author(s):  
D. Kumar ◽  
N. Sudhir ◽  
S. Yarmolenko ◽  
Q. Wei ◽  
J. Sankar ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Transmission Electron ◽  
Thin Film Composites ◽  
Film Composites

Thin films composite materials consisting of metallic nanocrystals embedded in an insulator host have been synthesized using alternating-target pulsed laser deposition of Fe/Ni and Al2O3. The evaluation of structural quality of the thin film composites using high resolution transmission electron microscopy and scanning transmission electron microscopy with atomic number contrast has revealed the formation of a biphase system with thermodynamically driven segregation of Ni and alumina during pulsed laser deposition. The best hardness values of the thin film composites, measured using nanoindentation techniques, was found to 20–30% larger than pure alumina films fabricated under identical conditions. The improvement in values of hardness of Al2O3 thin films by embedding metal nanocrystals is related to the evolution of a microstructure which efficiently hinders the manipulation and movement of dislocation and the growth of microcracks, which in turn, is achieved by grain boundary hardening.

scholarly journals High Reliability and Fast-Speed Phase-Change Memory Based on Sb70Se30/SiO2 Multilayer Thin Films

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Dan Zhang ◽  
Yifeng Hu ◽  
Haipeng You ◽  
Xiaoqin Zhu ◽  
Yuemei Sun ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Phase Change ◽  
Crystallization Temperature ◽  
High Reliability ◽  
Rf Magnetron Sputtering ◽  
Multilayer Thin Films ◽  
Multilayer Composite ◽  
Data Retention ◽  
Composite Thin Films

Sb70Se30/SiO2 multilayer thin films were applied to improve the thermal stability by RF magnetron sputtering on SiO2/Si (100) substrates. The characteristics of Sb70Se30/SiO2 multilayer thin films were investigated in terms of crystallization temperature, ten years of data retention, and energy bandgap. It is observed that the crystallization temperature, 10-year data retention, and resistance of Sb70Se30/SiO2 multilayer composite thin films exhibited a higher value, suggesting that Sb70Se30/SiO2 multilayer composite thin films have superior thermal stability. The AFM measurement suggests that the SbSe (1 nm)/SiO (9 nm) multilayer thin films possess a smaller surface roughness (RMS = 0.23 nm). Besides, it was found that the phase-change time of SbSe (1 nm)/SiO (9 nm) multilayer thin films was shorter than that of GST in the process of crystallization and amorphization.

scholarly journals Properties of multilayer composite thin films based on morphotropic phase boundary Pb(Mg1/3Nb2/3)O3-PbTiO3

2012 ◽  
Vol 520 (24) ◽  
pp. 7205-7211 ◽  
Author(s):  
H. El Hosiny Ali ◽  
R. Jiménez ◽  
J. Ricote ◽  
J. Pérez de la Cruz ◽  
J.R.A. Fernandes ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Multilayer Composite ◽  
Composite Thin Films

Features of Obtaining ZnO:Ag Thin Films Systems by the Method of Simultaneous Magnetron Sputtering with Subsequent Annealing

2021 ◽  
Vol 893 ◽  
pp. 11-15
Author(s):  
Pavels Sarajevs ◽  
Vjaceslavs Gerbreders ◽  
Edmunds Tamanis
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Heavy Metal ◽  
Optical Properties ◽  
Magnetron Sputtering ◽  
Metal Ions ◽  
Thermal Annealing ◽  
Heavy Metal Ions ◽  
Thin Film Composites ◽  
Film Composites

This work describes the study of the effect of thermal annealing on the properties of the ZnO:Ag thin film composites, which are the basis of sensors of heavy metal ions, as well as sensors of poisonous and explosive substances. Changes of the optical properties and morphology of the surfaces of composites with five different component ratios were analyzed. The studies performed have revealed significant changes in the properties of nanocomposites ZnO:Ag. This study may become the basis for future works on improving the sensitivity of sensors of poisonous and explosive substances.

PLZT-based multilayer composite thin films, part II: Modeling of the dielectric and hysteresis properties

1996 ◽  
Vol 177 (1) ◽  
pp. 237-253 ◽  
Author(s):  
D. E. Dausch ◽  
E. Furman ◽  
F. Wang ◽  
G. H. Haertling
Keyword(s):  
Thin Films ◽  
Multilayer Composite ◽  
Composite Thin Films ◽  
Hysteresis Properties
Sign in / Sign up

Export Citation Format

Share Document