Journal ArticleDOI
Nanoindentation of hard multilayer coatings: Finite element modelling
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TLDR
In this paper, the nanoindentation-induced deformation in TiSiN-based multilayer coatings was simulated by means of finite element modeling (FEM) with particular emphasis on the relationship between stress concentrations and crack initiation.Abstract:
Stress concentrations undermine the load-bearing ability of superhard TiSiN coatings. Experimental studies have shown that multilayer coatings that contain TiSiN layers alternating with ceramic layers with dissimilar mechanical properties suppress contact damage during nanoindentation. In this work, nanoindentation-induced deformation in TiSiN-based multilayer coatings was simulated by means of finite element modelling (FEM). Stress distributions under moderate indentation loading in the structure were quantified with particular emphasis on the relationship between stress concentrations and crack initiation. The results showed that the structural layering can be used to modify the stress distribution, and lower the overall stress level within the coating. In the case of radial tensile stresses at the coating/substrate interface, a reduction ∼50% has been achieved through layering. The resistance to shear damage can also be improved by optimising the multilayer structure.read more
Citations
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Journal ArticleDOI
Adaptive multicomponent nanocomposite coatings in surface engineering
TL;DR: In this article, experimental research on nanocomposite protective coatings of various chemical compositions and structure is reviewed, for adaptive multielement and multilayer systems with specific phase composition, structure, substructure, stress state, and high functional properties.
Journal ArticleDOI
In-situ Observation of Cross-Sectional Microstructural Changes and Stress Distributions in Fracturing TiN Thin Film during Nanoindentation
Angelika Zeilinger,Juraj Todt,Christina Krywka,Martin Müller,Werner Ecker,Bernhard Sartory,Michael Meindlhumer,Mario Stefenelli,Rostislav Daniel,Christian Mitterer,Jozef Keckes +10 more
TL;DR: The first in-situ characterization of microstructural changes and multi-axial stress distributions in a wedge-indented 9 μm thick nanocrystalline TiN film volume performed using synchrotron cross-sectional X-ray nanodiffraction is reported.
Journal ArticleDOI
Extremely hard, damage-tolerant ceramic coatings with functionally graded, periodically varying architecture
P.C. Wo,P.C. Wo,Xiaoli Zhao,Paul Munroe,Zhifeng Zhou,Kwok Yan Li,Daryoush Habibi,Zonghan Xie +7 more
TL;DR: In this paper, a functional graded multilayer structure consisting of alternating TiN/TiSiN layers was synthesized in an attempt to overcome the innate brittleness of TiSiN nanocomposite coatings, whilst maintaining high hardness.
Journal ArticleDOI
Surface Electronic Structure and Mechanical Characteristics of Copper–Cobalt Oxide Thin Film Coatings: Soft X-ray Synchrotron Radiation Spectroscopic Analyses and Modeling
Amun Amri,Amun Amri,Zhong-Tao Jiang,Parisa A. Bahri,Chun-Yang Yin,Xiaoli Zhao,Zonghan Xie,Zonghan Xie,Xiaofei Duan,Hantarto Widjaja,M. Mahbubur Rahman,Trevor Pryor +11 more
TL;DR: In this paper, a novel copper-cobalt oxide thin film with different copper/copper molar ratios, namely, [Cu]/[Co] = 0.5, 1, and 2, has been successfully coated on aluminum substrates via a simple and cost effective sol-gel dip-coating method.
Journal ArticleDOI
Annealing effects on microstructural, optical, and mechanical properties of sputtered CrN thin film coatings: Experimental studies and finite element modeling
Khalil Ibrahim,M. Mahbubur Rahman,M. Mahbubur Rahman,Xiaoli Zhao,Jean-Pierre Veder,Zhifeng Zhou,Ehsan Mohammadpour,Ridha Hameed Majeed,Aleksandar N. Nikoloski,Zhong-Tao Jiang +9 more
TL;DR: Chromium nitride (CrN) coatings were deposited by magnetron sputtering onto Si(100) substrates and then annealed at different temperatures (500-800 °C in steps of 100 ºC) in air for 1 1/h.
References
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Journal ArticleDOI
Thermal Barrier Coatings for Gas-Turbine Engine Applications
TL;DR: In this article, the structure, properties, and failure mechanisms of thermal barrier coatings (TBCs) are reviewed, together with a discussion of current limitations and future opportunities.
Journal ArticleDOI
Tough, bio-inspired hybrid materials.
Etienne Munch,Maximimilan E. Launey,Daan Hein Alsem,Daan Hein Alsem,Eduardo Saiz,Antoni P. Tomsia,Robert O. Ritchie,Robert O. Ritchie +7 more
TL;DR: In this article, the authors emulate Nature's toughening mechanisms through the combination of two ordinary compounds, aluminum oxide and polymethylmethacrylate, into ice-templated structures whose toughness can be over 300 times (in energy terms) that of their constituents.
Journal Article
Tough, bio-inspired hybrid materials
TL;DR: This work emulates nature's toughening mechanisms by combining two ordinary compounds, aluminum oxide and polymethyl methacrylate, into ice-templated structures whose toughness can be more than 300 times that of their constituents.
Journal ArticleDOI
Microstructural design of hard coatings
TL;DR: In this article, the authors demonstrate the correlation between microstructure and mechanical as well as tribological properties of hard ceramic coatings and demonstrate that nanostructure dependent hardness increase (compared to hardness of the bulk counterparts) sustains higher annealing temperatures than hardness increase due to an increased density of point-and/or line-defects.
Journal ArticleDOI
Structural basis for the fracture toughness of the shell of the conch Strombus gigas
TL;DR: Here it is shown that the resistance of the shell of the conch Strombus gigas to catastrophic fracture can be understood quantitatively by invoking two energy-dissipating mechanisms: multiple microcracking in the outer layers at low mechanical loads, and crack bridging in the shell's tougher middle layers at higher loads.
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