BEHZAD SADEGHI
@sav.sk
Slovak Academy of Science
Slovak Academy of Science
RESEARCH INTERESTS
1- Grain boundary engineering, 2- Microstructure-processing-property relationship in metals, 3- Metal based composites,
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Behzad Sadeghi, Pasquale Cavaliere, and Ali Shabani
Elsevier BV
Behzad Sadeghi and Pasquale Cavaliere
Elsevier BV
Behzad Sadeghi
MDPI AG
We are pleased to present this Special Issue entitled “Advanced High-Performance Metal Matrix Composites (MMCs),” which explores promising materials science that will change everything from aerospace to automotive technology [...]
Behzad Sadeghi, Pasquale Cavaliere, Martin Baloga, Catalin Iulian Pruncu, and Ali Shabani
Elsevier BV
Arun Gopinathan, Jaroslav Jerz, Jaroslav Kováčik, Behzad Sadeghi, and Pasquale Cavaliere
Elsevier BV
P. Cavaliere, A. Perrone, A. Silvello, A. Laska, G. Blasi, I.G. Cano, B. Sadeghi, and S. Nagy
Elsevier BV
Behzad Sadeghi, Pasquale Cavaliere, Ali Shabani, Catalin Iulian Pruncu, and Luciano Lamberti
SAGE Publications
This paper presents a critical review on the measuring methods and parameters affecting nano-tribology in the context of nano-scale wear. Nano-scale wear phenomena play a crucial role in various industries, including micro/nano-systems, electronics, and biotechnology. The review begins by discussing the significance of nano-scale wear and its impact on device performance, lifespan, durability, energy efficiency, cost savings, and environmental sustainability. It then delves into the measuring methods employed to assess nano-scale wear, including scanning probe microscopy (SPM) techniques such as atomic force microscopy (AFM) and friction force microscopy (FFM). The capabilities of AFM and FFM in studying the roughness of surface, adhesion, friction, scratch, abrasion, and nano-scale material transfer are highlighted. Additionally, the review explores the parameters affecting nano-wear, such as lubrication strategies, stress levels, sliding velocity, and atomic-scale reactions. The article concludes by emphasizing the importance of advanced microscopy techniques in understanding tribological mechanisms at different scales, bridging the gap between macro and nano-tribology studies.
B. Sadeghi, P. Cavaliere, A. Laska, A. Perrone, G. Blasi, A. Gopinathan, M. Shamanian, and F. Ashrafizadeh
Elsevier BV
Behzad Sadeghian, Aboozar Taherizadeh, Talieh Salehi, Behzad Sadeghi, and Pasquale Cavaliere
MDPI AG
Joining of stainless steel to carbon steel is widely used in various industries. Resistance spot welding (RSW) is a suitable process for joining steel sheets. Due to the complexity and importance of optimizing the parameters, numerical simulation of this process was considered. In this research, the electrical-thermal-mechanical simulation of RSW of 304 stainless steel to St37 carbon steel was performed using finite element method (FEM). Then, the simulated weld nugget size was compared with the experimental results of optical microscopy (OM). In addition, diffusion of metallic elements of the steels in the molten region was simulated using Fick’s equation and compared with experimental results of energy-dispersive X-ray spectroscopy (EDS). It was shown that diffusion of Cr and Ni through the weld nugget, would make a new stainless steel structure. Microstructure prediction of the heat affected zone (HAZ) was performed using Koistinen–Marburger and Leblond–Devaux equations to predict the percentage of martensite and ferrite-perlite phases during the heating and cooling stages of the specimens from room temperature to the peak temperature and cooling down under the Mf temperature. The results of this simulation were validated by scanning electron microscopy (SEM) images and shear tensile and micro-hardness test results. The simulation results showed that increasing the heat input from 1250 A during 0.5 s to 3750 A during 1.5 s, increases the percentage of martensite, from 40% to 80%, in the HAZ and widens the martensite region.
Behzad Sadeghi, Behzad Sadeghian, Aboozar Taherizadeh, Aleksandra Laska, Pasquale Cavaliere, and Arun Gopinathan
MDPI AG
The thermo-mechanical behavior of nanosized Al2O3 particles reinforcing aluminum was analyzed in the present paper. The material was prepared by spark plasma sintering and friction stir welding. The thermal stresses affecting the composite behavior during welding were modeled through COMSOL MultiPhysics, and the results were validated by the analyses of the composites’ mechanical properties. The spark-plasma-sintered materials presented limited porosity, which was taken into account during the modeling phase. Both model and experiments revealed that higher heat input is related to better material mixing during welding and sound mechanical properties. Thermal stresses lead to residual stresses close to 300 MPa in the thermo-mechanically affected zone for processing conditions of 1900 RPM and 37 mm/min. This leads to an increase in hardness up to 72 HV.
Ashkan Bahadoran, Jeffrey Roshan De Lile, Saeid Masudy-Panah, Behzad Sadeghi, Jiaxin Li, Mohammad Hosein Sabzalian, Seeram Ramakrishna, Qinglei Liu, Pasquale Cavaliere, and Arun Gopinathan
MDPI AG
Waste-derived materials obtained from the recovery and recycling of electronic waste (e-waste) such as batteries and printed circuit boards have attracted enormous attention from academia and industry in recent years, especially due to their eco-friendly nature and the massive increment in e-waste due to technological development. Several investigations in the literature have covered the advances achieved so far. Meanwhile, photocatalytic applications are especially of interest since they maintain mutual benefits and can be used for H2 production from solar water splitting based on semiconductor processing as a proper environmentally friendly technique for solar energy conversion. In addition, they can be utilized to degrade a variety of organic and non-organic contaminations. Nonetheless, to the best of the authors’ knowledge, there has not been any comprehensive review that has specifically been focused on e-waste-derived photocatalytic materials. In this regard, the present work is dedicated to thoroughly discussing the related mechanisms, strategies, and methods, as well as the various possible photocatalysts synthesized from e-wastes with some critiques in this field. This brief overview can introduce modern technologies and promising possibilities for e-waste valorization, photocatalytic processes, and new photocatalytic degradation methods of eco-friendly nature. This paper discusses various e-waste-obtained photocatalytic materials, synthesis procedures, and applications, as well as several types of e-waste, derived materials such as TiO2, ZnO, indium tin oxide, and a variety of sulfide- and ferrite-based photocatalytic materials.
Behzad Sadeghi, Ali Shabani, Ali Heidarinejad, Aleksandra Laska, Marek Szkodo, and Pasquale Cavaliere
MDPI AG
An aluminum matrix composite with dispersed carbon nanotubes (CNTs) was produced via flake powder metallurgy using a micro-rolling process and vacuum hot pressing (VHP), followed by conventional rolling using a macro-rolling process. The microstructure and mechanical properties of the produced composites were studied. In addition, a new quantitative model was introduced to study the dislocation density based on the microstructural parameters. The results revealed that the distribution characteristics of the CNTs in the Al matrix and the Al-CNT interfaces were the two main governing parameters of dislocation density. Moreover, the dependence of dislocation density on the geometry of the grains and crystallographic texture was shown in this model. The microstructural evolution revealed that a lamellar grain structure had been achieved, with a high capacity for the storage of dislocation. A uniform distribution of CNTs with high bonding quality was also seen in the final microstructure.
B. Sadeghi, P. Cavaliere, and Catalin Iulian Pruncu
Elsevier BV
Ashkan Bahadoran, Qinglei Liu, Seeram Ramakrishna, Behzad Sadeghi, Moara Marques De Castro, and Pasquale Daniele Cavaliere
MDPI AG
Today, as a result of the advancement of technology and increasing environmental problems, the need for clean energy has considerably increased. In this regard, hydrogen, which is a clean and sustainable energy carrier with high energy density, is among the well-regarded and effective means to deliver and store energy, and can also be used for environmental remediation purposes. Renewable hydrogen energy carriers can successfully substitute fossil fuels and decrease carbon dioxide (CO2) emissions and reduce the rate of global warming. Hydrogen generation from sustainable solar energy and water sources is an environmentally friendly resolution for growing global energy demands. Among various solar hydrogen production routes, semiconductor-based photocatalysis seems a promising scheme that is mainly performed using two kinds of homogeneous and heterogeneous methods, of which the latter is more advantageous. During semiconductor-based heterogeneous photocatalysis, a solid material is stimulated by exposure to light and generates an electron–hole pair that subsequently takes part in redox reactions leading to hydrogen production. This review paper tries to thoroughly introduce and discuss various semiconductor-based photocatalysis processes for environmental remediation with a specific focus on heterojunction semiconductors with the hope that it will pave the way for new designs with higher performance to protect the environment.
Ashkan Bahadoran, Nooshin Bahadoran Baghbadorani, Jeffrey Roshan De Lile, Saeid Masudy-Panah, Behzad Sadeghi, Jinghan Li, Seeram Ramakrishna, Qinglei Liu, Baadal Jushi Janani, and Ali Fakhri
Elsevier BV
Behzad Sadeghi, Pasquale Cavaliere, Martin Balog, Catalin Iulian Pruncu, and Ali Shabani
Elsevier BV
Behzad Sadeghi, Pasquale Cavaliere, Catalin Iulian Pruncu, Martin Balog, Moara Marques de Castro, and Rajni Chahal
Informa UK Limited
B. Sadeghi and P. Cavaliere
Springer Science and Business Media LLC
Behzad Sadeghi, Genlian Fan, Zhanqiu Tan, Zhiqiang Li, Akira Kondo, and Makio Naito
Hosokawa Powder Technology Foundation
Mojtaba Najafizadeh, Ashkan Bahadoran, Mansoor Bozorg, Behzad Sadeghi, Jiamiao Liang, and Deliang Zhang
Elsevier BV
Ashkan Bahadoran, Seeram Ramakrishna, Saeid Masudy-Panah, Jeffrey Roshan De Lile, Behzad Sadeghi, Jinghan Li, JiaJun Gu, and Qinglei Liu
Elsevier BV
Mojtaba Najafizadeh, Mehran Ghasempour-Mouziraji, Behzad Sadeghi, and Pasquale Cavaliere
Springer Science and Business Media LLC
AbstractSilicon nitride (Si3N4) coating was deposited on AISI D2 tool steel through employing duplex surface treatments—pack siliconizing followed by plasma nitriding. Pack cementation was performed at 650 °C, 800 °C, and 950 °C for 2 and 3 hours by using various mixtures to realize the silicon coating. X-ray diffraction analyses and scanning electron microscopy observations were employed for demonstrating the optimal process conditions leading to high coating adhesion, uniform thickness, and composition. The optimized conditions belonging to siliconizing were employed to produce samples to be further processed via plasma nitriding. This treatment was performed with a gas mixture of 75 pct H2-25 pct N2, at the temperature of 550 °C for 7 hours. The results showed that different nitride phases such as Si3N4-β, Si3N4-γ, Fe4N, and Fe3N can be recognized as coatings reinforcements. It was demonstrated that the described composite coating procedure allowed to obtain a remarkable increase in hardness (80 pct higher with respect to the substrate) and wear resistance (30 pct decrease of weight loss) of the tool steel.
B. Sadeghi, Z. Tan, J. Qi, Zhiqiang Li, Xinrui Min, Z. Yue and G. Fan
B. Sadeghi and P. Cavaliere
The Al-Mg alloy structure reinforced with carbon nanotubes was evaluated after the composites production through a modified flake metallurgy technique followed by hot extrusion. The obtained bimodal microstructure of the matrix allowed to identify the microstructural mechanisms leading to high strength; uniform elongation and strain hardening ability of the produced composites. The presence of Mg transformed the native Al2O3 layer into spinel MgAl2O4 nano-phases dispersed both inside CG and UFGs and on the interfaces, improving the interfacial bonding of Al-Al as well as Al-CNT. The effect of the reinforcing phases percentages on the dislocations mechanisms evolution was evaluated through stress relaxation tests leading to the underlying of the effect of reinforcing phases on the modification of the interphase influence zone
Behzad Sadeghi, Jiashuo Qi, Xinrui Min, and Pasquale Cavaliere
Elsevier BV