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Fathalian M., Postek E. W., Tahani M., Sadowski T.♦, A Comprehensive Study of Al2O3 Mechanical Behavior Using
Density Functional Theory and Molecular Dynamics,
Molecules, ISSN: 1420-3049, DOI: 10.3390/molecules29051165, Vol.29, pp.1165-1165-18, 2024Abstract: This study comprehensively investigates Al2O3’s mechanical properties, focusing on fracture toughness, surface energy, Young’s modulus, and crack propagation. The density functional
theory (DFT) is employed to model the vacancies in Al2O3, providing essential insights into this material’s structural stability and defect formation. The DFT simulations reveal a deep understanding of vacancy-related properties and their impact on mechanical behavior. In conjunction with molecular dynamics (MD) simulations, the fracture toughness and crack propagation in Al2O3 are explored, offering valuable information on material strength and durability. The surface energy of Al2O3 is also assessed using DFT, shedding light on its interactions with the surrounding environment.
The results of this investigation highlight the significant impact of oxygen vacancies on mechanical characteristics such as ultimate strength and fracture toughness, drawing comparisons with the effects observed in the presence of aluminum vacancies. Additionally, the research underscores the validation of fracture toughness outcomes derived from both DFT and MD simulations, which align well with findings from established experimental studies. Additionally, the research underscores the validation of fracture toughness outcomes derived from DFT and MD simulations, aligning well with findings from established experimental studies. The combination of DFT and MD simulations provides a robust framework for a comprehensive understanding of Al2O3’s mechanical properties, with implications for material science and engineering applications. Keywords: Al2O3, fracture toughness, density functional theory, molecular dynamics Affiliations:
Fathalian M. | - | IPPT PAN | Postek E. W. | - | IPPT PAN | Tahani M. | - | IPPT PAN | Sadowski T. | - | Lublin University of Technology (PL) |
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Fathalian ., DFT study of Ni, Cu, Cd and Ag heavy metal atom adsorption onto the surface of the zinc-oxide nanotube and zinc-oxide graphene-like structure,
MATERIALS CHEMISTRY AND PHYSICS, ISSN: 0254-0584, DOI: 10.1016/j.matchemphys.2018.09.016, pp.https://www.sciencedirect.com/science/article/pii/S0254058418307673-https://www.sciencedirect.com/science/article/pii/S0254058418307673, 2024 | |
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Fathalian M., Postek E.W., Sadowski T.♦, Mechanical and Electronic Properties of Al(111)/6H-SiC Interfaces: A DFT Study,
Molecules, ISSN: 1420-3049, DOI: 10.3390/molecules28114345, Vol.28, No.11, pp.4345-1-19, 2023Abstract: A density functional theory (DFT) calculation is carried out in this work to investigate the effect of vacancies on the behavior of Al(111)/6H SiC composites. Generally, DFT simulations with appropriate interface models can be an acceptable alternative to experimental methods. We developed two modes for Al/SiC superlattices: C-terminated and Si-terminated interface configurations. C and Si vacancies reduce interfacial adhesion near the interface, while Al vacancies have little effect. Supercells are stretched vertically along the z-direction to obtain tensile strength. Stress–strain diagrams illustrate that the tensile properties of the composite can be improved by the presence of a vacancy, particularly on the SiC side, compared to a composite without a vacancy. Determining the interfacial fracture toughness plays a pivotal role in evaluating the resistance of materials to failure. The fracture toughness of Al/SiC is calculated using the first principal calculations in this paper. Young’s modulus and dominant surface energy are calculated to obtain the fracture toughness. Young’s modulus is higher for C-terminated configurations than for Si-terminated configurations. Surface energy plays a dominant role in determining the fracture toughness process. Finally, to better understand the electronic properties of this system, the density of states (DOS) is calculated. Keywords: DFT,interface,surface energy,young’s modulus,fracture toughness Affiliations:
Fathalian M. | - | IPPT PAN | Postek E.W. | - | IPPT PAN | Sadowski T. | - | Lublin University of Technology (PL) |
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Fathalian M., Effect of various defects on mechanical and electronic properties of zinc-oxide graphene-like structure: A DFT study
,
VACUUM, ISSN: 0042-207X, DOI: 10.1016/j.vacuum.2019.04.003, pp.Volume 165, July 2019, Pages 26-34-https://www.sciencedirect.com/science/article/pii/S0042207X18322838?__cf_chl_tk=VfuZsUQyvfV3YpU5Oaby_txrCEjkrsdNOqL.YLb_6pM-1713188576-0.0.1.1-1386, 2018 | |