Browsing by Author "Vini, Mohammad Heydari"

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Citation Count: 0
Bonding properties of Al/Sn/Al laminates fabricated via electrically press bonding process
(Elsevier, 2024) Daneshmand, Saeed; Salahshour, Soheıl; Sajadi, S. Mohammad; Jasim, Dheyaa J.; Salahshour, Soheil; Hekmatifar, M.; Nasajpour-Esfahani, Navid
In the late 1980s, electrically assisted press bonding gained attention in the semiconductor industry due to its ability to improve bond quality and reliability. This bonding method has several advantages, including improved bond strength, reduced bonding time, and the ability to bond materials that are traditionally challenging to bond. This connection method is commonly used in applications where high band strength, reliability, and electrical conductivity are critical, such as microelectronics manufacturing, semiconductor devices, and advanced packaging technologies. In this study, AA1100 bars were connected using an electrically assisted press connection process at current levels of 100A, 200A and 300A. Poor bond strength is an important drawback in bonding processes. Therefore, to solve this problem, Sn particles were used as a finishing process and filler metal to increase the bond strength of aluminum sheets during electric press joining. AA1100 bars were produced with different weight percentages (wt%) of Sn particles as interlayer filler at different levels of electric current. The results reveal that increasing the level of electric current and the weight percentage of Sn leads to stronger bond strength. In this study, a scanning electron microscope (SEM) is used to check the quality of the bond. It is worth mentioning that the analysis of the exfoliation surface by SEM is performed on the samples after the peeling test to check the quality of the bond. In addition, the findings reveal that the bond strength improves with Sn content and higher current levels due to the Joule heating effect in the electrical press bonding process.
Citation Count: 0
Corrosion and mechanical properties of Al/Al₂O₃ composites fabricated via accumulative roll bonding process: Experimental and numerical simulation
(Elsevier Science Sa, 2024) Salahshour, Soheıl; Daneshmand, Saeed; Alabboodi, Khalid O.; Ali, Ali B. M.; Jasim, Dheyaa J.; Salahshour, Soheil; Hekmatifar, Maboud
With the advancement of science and technology and the construction of metal-based composites (MMC), it became possible to achieve improved properties that were not easily available in an alloy. In fact, with the emergence of such technology, manufacturers were able to adjust the resulting materials according to their needs in such a way as to provide mechanical strength, hardness, corrosion resistance, or other desired properties. These composites were used in various aerospace, automotive, construction, and production industries. Aluminum-based composites are among the structures that have taken an important place in the industry due to their lightweight and high strength. The present study produced bi-alloy aluminum-based 1060/5083 composites fabricated with alumina particles with a Hot ARBp at T = 380 degrees C. Also, the effect of rolling steps on the roll bonding mechanism is investigated using numerical simulation. As the novelty of this study and for the first time, a bi-alloy 1050/5083 composites reinforced Al2O3 particles via ARB process have been produced and then, potential dynamic polarization in 3.5 Wt% NaCl solution was used to study the corrosion properties of these composites. The corrosion behavior of these samples was compared and studied with that of the annealed aluminum. The study aimed to investigate the bonding behavior between the bi-alloy layers. So, as a result of enhancing influence on the number of ARBp, this experimental investigation revealed a significant enhancement in the main electrochemical parameters and the inert character of the Alumina particles. Reducing the active zones of the material surfaces could delay the corrosion process. Results showed that the corrosion resistance of the sample fabricated after six steps improved more than 100 % in comparison with the initial annealed Al alloy. Also, the average peeling force improved from 45 N to 94 N for the sample fabricated with six steps. Moreover, at a higher number of steps, the corrosion of MMC improved. Moreover, increasing the number of ARB steps illustrated an improvement in the wear resistance of samples. Finally, the samples' bonding interface, corrosion surface, and peeled surface were investigated using scanning electron microscopy (SEM).
Citation Count: 0
Mechanical properties of aluminum /SiC bulk composites fabricated by aggregate accumulative press bonding and stir-casting process
(Elsevier, 2024) Daneshmand, Saeed; Salahshour, Soheıl; Basem, Ali; Mohammed, Abrar A.; Wais, Alaa Mohammed Hussein; Salahshour, Soheil; Hekmatifar, Maboud
Today, the emergence of composite structures can be considered a huge transformation on an industrial scale, especially in the transportation industry. Among all the structures made by the composite process, aluminum- based composites (AMMCs) are particularly popular both in the scientific and industrial fields. These structures are very light in weight and, at the same time, have significant strength. The ability to work with the machine in these structures is very high, and their plastic deformation is so high that they can be used in different industry sectors. Today, various methods are used to induce plastic deformation in aluminum-based composites (AMMCs). One of these methods is called aggregate accumulative press bonding (APB). The advantage of this method compared to other methods is that this method can create a homogeneous nanocomposite with ultra-fine grains. In the present study, the investigation of mechanical properties (MP's) of AA5083/5%SiC bulk composites fabricated via APB vs. pressing temperature (Temp) was conducted. All primary composite samples were fabricated via the stir-casting process (SCP). APB process was done on composite samples as a supplementary process. Finally, the effect of pressing Temp on the MP and microstructural properties (MSP) was investigated. The pressing Temp was varied between the ambient Temp's up to T = 300 degrees C. The MP were measured in this study by the Vickers micro-hardness (VMH) test, tensile test, and scanning electron microscopy (SEM). It was realized that the pressing Temp has a prominent effect on the MS and MP of fabricated 400 degrees C. degrees C . Samples fabricated at the ambient Temp have low ductility and high strength while for samples fabricated at T = 300 degrees C, the elongation and toughness values were higher than others. The TS of samples after 2 steps of APB at T = 200 degrees C degrees C is 1.31 times more than that of fabricated at T = 300 degrees C. degrees C . Elongation was reduced sharply to 1.8% after the two steps at the ambient Temp, while it was 21% for the annealed AA5083.
Citation Count: 0
A new approach for recycling, fabrication, and heat treatment of al base composites reinforced with rice husk ash particles
(Pergamon-elsevier Science Ltd, 2024) Vini, Mohammad Heydari; Salahshour, Soheıl; Hassan, Waqed H.; Khaddour, Mohammad H.; Jaafar, Mahdi Sh.; Salahshour, Soheil; Hekmatifar, Maboud
As a novel combined environmental toxicology technique to reduce the environmental hazards to humans, the utilization of agriculture waste as a novel waste material recycling process in aluminum metal matrix composites has been getting more attention to fabricate and improve the properties of this kind of composites. In this study, a new kind of metal matrix composite reinforced with rice husk ash particles has been fabricated. In the first step, the Al base composites reinforced with rice husk ash particles were fabricated via the compa casting process and the second step was the study of their mechanical, electrical, physical and wear properties. It also highlights the current application and future potential of agriculture-industrial waste-reinforced composites for various applications with a focus on material manufacturing in vessels, automobiles and other construction industries. Also, the annealing was performed after ARB on fabricated composites. Different elongation can happen during heating and annealing since the thermal expansion coefficients of composite samples are not equal and could weaken the strength of the interface. The examination unveiled that composites containing 10% by weight of RHA particulates exhibit superior mechanical and wear resistance compared to monolithic samples. Moreover, the average Vickers hardness of the samples increased from 154.0 to 168.0 for monolithic and 10% RHA samples, respectively, marking a 9% improvement.