Pasquale Cavaliere
@unisalento.it
Department of Innovation Engineering
University of Salento
Scopus Publications
Scopus Publications
Behzad Sadeghi, Pasquale Cavaliere, and Moara M. Castro
Elsevier BV
Behzad Sadeghi, Behzad Sadeghian, Pasquale Cavaliere, and Aboozar Taherizadeh
Elsevier BV
Hossein Ghari, Aboozar Taherizadeh, Behzad Sadeghian, Behzad Sadeghi, and Pasquale Cavaliere
Elsevier BV
Maryam Shojaie-bahaabad, Mansoor Bozorg, Mojtaba Najafizadeh, and Pasquale Cavaliere
Elsevier BV
P. Cavaliere, B. Sadeghi, A. Perrone, D. Marsano, and A. Marzanese
Elsevier BV
Behzad Sadeghi, Pasquale Cavaliere, Angelo Perrone, and Moara M. Castro
Elsevier BV
Hossein Mani, Aboozar Taherizadeh, Behzad Sadeghian, Behzad Sadeghi, and Pasquale Cavaliere
MDPI AG
Rotary friction welding is one of the most crucial techniques for joining different parts in advanced industries. Experimentally measuring the history of thermomechanical and microstructural parameters of this process can be a significant challenge and incurs high costs. To address these challenges, the finite element method was used to simulate thermomechanical and microstructural aspects of the welding of identical superalloy Inconel 718 tubes. Numerical simulation results were used to compute essential mechanical and metallurgical parameters such as temperature, strain, strain rate, volume fraction of dynamic recrystallization, and grain size distribution. These parameters were subsequently verified using experimental test results. The Johnson–Avrami model was utilized in the microstructural simulation to convert thermomechanical parameters into metallurgical factors, employing a FORTRAN subroutine. The calculated thickness of the recrystallization zone in the wall was 480 and 850 μm at the tube wall’s center and edge, respectively. These values were reported from experimental measurements as 500 and 800 μm, respectively. The predicted grain size changes from the center to the edge of the wall thickness, near the weld interface, ranged from 2.07 to 2.15 μm, comparable to the experimental measurements ranging from 1.9 to 2.2 μm. Various curves are also presented to explore the correlation between thermomechanical and microstructural parameters, with the experimental results revealing predictable microstructure evolutions correlated with thermomechanical changes.
Mojtaba Najafizadeh, Mansoor Bozorg, Sahar Yazdi, Negar Sarrafan, Mehran Ghasempour-Mouziraji, Constantinos Goulas, and Pasquale Cavaliere
Springer Science and Business Media LLC
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.
Pasquale Cavaliere, Angelo Perrone, Leandro Dijon, Aleksandra Laska, and Damian Koszelow
Elsevier BV
Ali Shabani, Alireza Bagheri, Mohammad Reza Toroghinejad, and Pasquale Cavaliere
Elsevier BV
Mojtaba Najafizadeh, Mehran Ghasempour-Mouziraji, C. Goulas, Morteza Hosseinzadeh, Mansoor Bozorg, and Pasquale Cavaliere
Springer Science and Business Media LLC
Behzad Sadeghi, Pasquale Cavaliere, Catalin Iulian Pruncu, Martin Balog, Moara Marques de Castro, and Rajni Chahal
Informa UK Limited
Ali Shabani, Mohammad Reza Toroghinejad, Marieh Aminaei, and Pasquale Cavaliere
Elsevier BV
Behzad Sadeghi, Pasquale Cavaliere, and Ali Shabani
Elsevier BV
Behzad Sadeghi and Pasquale Cavaliere
Elsevier BV
Aleksandra Laska, Behzad Sadeghi, Behzad Sadeghian, Aboozar Taherizadeh, Marek Szkodo, and Pasquale Cavaliere
Springer Science and Business Media LLC
AbstractThe friction stir welding process was simulated for joining AA6082 aluminum alloy with the use of the computational fluid dynamics method. Two different tool geometries were used—a tapered cylindrical pin (simple pin) and a hexagonal pin with grooves (complex pin). The analysis of the simulations performed was discussed in terms of temperature evolution during the process, total heat input, residual stresses and material flow. Simulations revealed that a 5% higher temperature, equal to maximum 406 °C, was provided when using the complex pin than with the simple pin. Higher temperature and higher shear stresses during the welding with the complex pin caused the introduction of higher residual stresses in the weld. Experimental results on the produced welds allowed observation of the microstructure of the joints, hardness tests in cross sections and tensile strength tests. Due to the higher temperature during the process with the complex pin and the more efficient recrystallization process, grain refinement in the SZ was more pronounced. The average grain size in the stir zone for the weld produced with the complex pin was equal to 11 ± 1 µm, and in the case of the simple pin 14 ± 1 µm. The presented hardness profiles revealed that the weld produced with a complex pin had higher hardness in the stir zone, equal to 89.5 ± 1.3 HV, which is consistent with the Hall-Petch relationship. The obtained UTS values corresponded to the joint efficiency of 72.5 ± 4.9% and 55.8 ± 8.6% for the weld produced with the complex pin and the simple pin.
Mojtaba Najafizadeh, Mansoor Bozorg, Mehran Ghasempour-Mouziraji, Constantions Goulas, and Pasqual Cavaliere
Elsevier BV
Behzad Sadeghi and Pasquale Daniele Cavaliere
MDPI AG
In response to the growing demand for high-strength and high-toughness materials in industries such as aerospace and automotive, there is a need for metal matrix composites (MMCs) that can simultaneously increase strength and toughness. The mechanical properties of MMCs depend not only on the content of reinforcing elements, but also on the architecture of the composite (shape, size, and spatial distribution). This paper focuses on the design configurations of MMCs, which include both the configurations resulting from the reinforcements and the inherent heterogeneity of the matrix itself. Such high-performance MMCs exhibit excellent mechanical properties, such as high strength, plasticity, and fracture toughness. These properties, which are not present in conventional homogeneous materials, are mainly due to the synergistic effects resulting from the interactions between the internal components, including stress–strain gradients, geometrically necessary dislocations, and unique interfacial behavior. Among them, aluminum matrix composites (AMCs) are of particular importance due to their potential for weight reduction and performance enhancement in aerospace, electronics, and electric vehicles. However, the challenge lies in the inverse relationship between strength and toughness, which hinders the widespread use and large-scale development of MMCs. Composite material design plays a critical role in simultaneously improving strength and toughness. This review examines the advantages of toughness, toughness mechanisms, toughness distribution properties, and structural parameters in the development of composite structures. The development of synthetic composites with homogeneous structural designs inspired by biological composites such as bone offers insights into achieving exceptional strength and toughness in lightweight structures. In addition, understanding fracture behavior and toughness mechanisms in heterogeneous nanostructures is critical to advancing the field of metal matrix composites. The future development direction of architectural composites and the design of the reinforcement and toughness of metal matrix composites based on energy dissipation theory are also proposed. In conclusion, the design of composite architectures holds enormous potential for the development of composites with excellent strength and toughness to meet the requirements of lightweight structures in various industries.
Behzad Sadeghi, Pasquale Cavaliere, and Behzad Sadeghian
MDPI AG
In this work, we propose a hybrid approach to solve the challenge of balancing strength and ductility in aluminum (Al) matrix composites. While some elements of our approach have been used in previous studies, such as in situ synthesis and ex situ augmentation, our work is innovative as it combines these techniques with specialized equipment to achieve success. We synthesized nanoscale Al3BC particles in situ using ultra-fine particles by incorporating carbon nanotubes (CNTs) into elemental powder mixtures, followed by mechanical activation and annealing, to obtain granular (UFG) Al. The resulting in situ nanoscale Al3BC particles are uniformly dispersed within the UFG Al particles, resulting in improved strength and strain hardening. By innovating the unique combination of nanoscale Al3BC particles synthesized in situ in UFG Al, we enabled better integration with the matrix and a strong interface. This combination provides a balance of strength and flexibility, which represents a major breakthrough in the study of composites. (Al3BC, CNT)/UFG Al composites exhibit simultaneous increases in strength (394 MPa) and total elongation (19.7%), indicating increased strength and suggesting that there are promising strengthening effects of in situ/ex situ reinforcement that benefit from the uniform dispersion and the strong interface with the matrix. Potential applications include lightweight and high-strength components for use in aerospace and automotive industries, as well as structural materials for use in advanced mechanical systems that require both high strength and toughness.
Pasquale Cavaliere, Angelo Perrone, Debora Marsano, Antonio Marzanese, and Behzad Sadeghi
Elsevier BV
Pasquale Cavaliere, Angelo Perrone, and Debora Marsano
Elsevier BV
Pasquale Cavaliere, Angelo Perrone, Debora Marsano, and Vito Primavera
Wiley
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