The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Mohammad Reza Toroghinejad - One of the best experts on this subject based on the ideXlab platform.
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nanostructure formation during accumulative Roll Bonding of commercial purity titanium
Materials Characterization, 2016Co-Authors: Mohsen Karimi, Mohammad Reza Toroghinejad, J DutkiewiczAbstract:Abstract In this investigation, commercial purity titanium (CP–Ti) was subjected to accumulative Roll Bonding (ARB) process up to 8 cycles (equivalent strain of 6.4) at the ambient temperature. Transmission electron microscopy (TEM) and X–ray diffraction line profile analysis (XRDLPA) were utilized to investigate the microstructure and grain size evolution. Both characterization techniques could clarify the non–uniform microstructure in the early stages and the uniform microstructure in the final stages of the process. The effectiveness of ARB for the fabrication of the nano–grained structure in CP–Ti was revealed. It was found that the SFE is not the only factor affecting grain refinement, as compared with other studies on ARB of FCC materials. Influence of other factors such as the melting temperature and the crystalline structure of the material was determined on the grain refinement.
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corrosion investigation of al sic nano composite fabricated by accumulative Roll Bonding arb process
Journal of Alloys and Compounds, 2013Co-Authors: E Darmiani, I Danaee, M A Golozar, Mohammad Reza ToroghinejadAbstract:Abstract In the present research an extend investigation about the corrosion behaviour of Al–SiC nano-composite, produced by accumulative Roll Bonding process, has been made. Hence various tests such as polarisation and electrochemical impedance spectroscopy in 3.5 with % NaCl solution were carried out. Morphology of pits for the latest samples was studied and analysed by SEM–EDS and AFM. During the tests it was observed that, increasing the ARB cycles will be lead to decrease in number of pits and increase in pitting corrosion resistance. This fact may be due to the uniform distribution of SiC in matrix and its refinement. According to the SEM micrograph, it was observed that by increasing the ARB cycles, the SiC particle size becomes less than 100 mm.
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on the use of accumulative Roll Bonding process to develop nanostructured aluminum alloy 5083
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Mohammad Reza Toroghinejad, Roohollah Jamaati, Fakhreddin AshrafizadehAbstract:Abstract In the present study, the effect of accumulative Roll Bonding (ARB) process at room temperature on the microstructure and mechanical properties of AA5083 strip was investigated. Microstructural observations were done by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Also, mechanical properties were performed by tensile, hardness, and microhardness tests. It was observed that accumulative Roll Bonding is a promising process for production of nanostructured (80 nm) AA5083 strips. Nano shear bands were formed in the microstructure after the fourth cycles. When the number of cycles increased, the tensile strength and hardness of the accumulatively Roll bonded strips increased. However, by increasing the number of cycles, the elongation value decreased except for the last (sixth) cycle. It was found that when the number of cycles increased, the distribution of microhardness values became more uniform. After the tensile test, deBonding can be observed especially in the interface formed in the last cycle. Observations revealed that the failure mode in the accumulatively Roll bonded AA5083 strip was a shear ductile rupture with elongated shallow shear dimples.
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fabrication of al ni cu composite by accumulative Roll Bonding and electroplating processes and investigation of its microstructure and mechanical properties
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2012Co-Authors: Ali Shabani, Mohammad Reza Toroghinejad, Ali ShafyeiAbstract:Al–Ni–Cu composite was produced using accumulative Roll Bonding (ARB) and electroplating processes. Nickel was electroplated on copper substrate for a certain time and voltage. In this study, the microstructural evolution and mechanical properties of the Al–Ni–Cu composite during various ARB cycles were studied by optical and scanning electron microscopes, microhardness, tensile and bending tests. It was observed that at first, nickel layers and then copper layers, were necked, fractured and distributed in aluminum matrix as accumulative Roll Bonding cycles were increased. Finally, after 11 cycles of ARB process, a completely uniform composite was produced with a homogeneous distribution of copper and nickel particles in aluminum matrix. The results showed that by increasing the number of ARB cycles, the bending strength of produced composite was increased. Also, it was found that when the number of cycles was increased, not only elongation was increased but also the tensile strength of the composite was improved. Microhardness for different elements in different cycles was also evaluated. Finally, fracture surfaces of samples were studied, using scanning electron microscopy (SEM), to reveal the failure mechanism.
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Investigation of nanostructured Al/Al2O3 composite produced by accumulative Roll Bonding process
Materials and Design, 2012Co-Authors: Roohollah Jamaati, Mohammad Reza Toroghinejad, Jan DutkiewiczAbstract:In this study, the accumulative Roll Bonding (ARB) process was used for manufacturing nanostructured aluminum/15. vol.% alumina composites. Microstructural characterization by transmission electron microscopy (TEM) identified the severe shear deformation, however, the grain growth was restrained by particles of oxide film and recrystallization produced the nanograins with an average size
Roohollah Jamaati - One of the best experts on this subject based on the ideXlab platform.
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on the use of accumulative Roll Bonding process to develop nanostructured aluminum alloy 5083
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Mohammad Reza Toroghinejad, Roohollah Jamaati, Fakhreddin AshrafizadehAbstract:Abstract In the present study, the effect of accumulative Roll Bonding (ARB) process at room temperature on the microstructure and mechanical properties of AA5083 strip was investigated. Microstructural observations were done by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Also, mechanical properties were performed by tensile, hardness, and microhardness tests. It was observed that accumulative Roll Bonding is a promising process for production of nanostructured (80 nm) AA5083 strips. Nano shear bands were formed in the microstructure after the fourth cycles. When the number of cycles increased, the tensile strength and hardness of the accumulatively Roll bonded strips increased. However, by increasing the number of cycles, the elongation value decreased except for the last (sixth) cycle. It was found that when the number of cycles increased, the distribution of microhardness values became more uniform. After the tensile test, deBonding can be observed especially in the interface formed in the last cycle. Observations revealed that the failure mode in the accumulatively Roll bonded AA5083 strip was a shear ductile rupture with elongated shallow shear dimples.
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Investigation of nanostructured Al/Al2O3 composite produced by accumulative Roll Bonding process
Materials and Design, 2012Co-Authors: Roohollah Jamaati, Mohammad Reza Toroghinejad, Jan DutkiewiczAbstract:In this study, the accumulative Roll Bonding (ARB) process was used for manufacturing nanostructured aluminum/15. vol.% alumina composites. Microstructural characterization by transmission electron microscopy (TEM) identified the severe shear deformation, however, the grain growth was restrained by particles of oxide film and recrystallization produced the nanograins with an average size
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Cold Roll Bonding bond strengths: review
Materials Science and Technology, 2011Co-Authors: Roohollah Jamaati, Mohammad Reza ToroghinejadAbstract:Cold Roll Bonding (CRB), a well established and widely used manufacturing process, is a solid state Bonding process to join similar and dissimilar metals. The present work offers a review of the CRB process and effective parameters on bond strength of cold Roll bonded materials. The effects of different amounts of reduction in thickness, annealing treatment, initial thickness, Rolling speed, Rolling direction, friction coefficient and presence of particles between strips on bond strength were evaluated. It was found that higher reduction in thickness and friction coefficient, lower initial thickness, Rolling speed and amount of particles were the important factors involved in improving bond strength. In addition, annealing treatment before and/or after the CRB process increased bond strength, while the effect of preRolling annealing was more pronounced. Finally, it has been indicated that bond strength of cold Roll bonded fcc materials is stronger than that of the bcc and hcp materials.
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The Role of Surface Preparation Parameters on Cold Roll Bonding of Aluminum Strips
Journal of Materials Engineering and Performance, 2011Co-Authors: Roohollah Jamaati, Mohammad Reza ToroghinejadAbstract:It is the objective of this article to investigate the influence of surface preparation on the cold Roll Bonding (CRB) process. In this context, the effects of surface preparation parameters consisting of surface preparation method, surface roughness, scratch-brushing parameters, and the delay time between surface preparation and Rolling are investigated on the bond strength of aluminum strips. The bond strength of two adjacent aluminum strips produced by the CRB process is evaluated by the peeling test. Furthermore, the interface region is investigated by metallographic observations. Our findings indicate that higher surface roughness values and shorter delay times improve the bond strength. It is also found that degreasing followed by scratch-brushing yield the best Bonding properties.
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high strength and highly uniform composite produced by anodizing and accumulative Roll Bonding processes
Materials & Design, 2010Co-Authors: Roohollah Jamaati, Mohammad Reza ToroghinejadAbstract:Abstract The anodizing and accumulative Roll Bonding (ARB) processes are used in this paper as a new, effective alternative for manufacturing high-strength and highly-uniform aluminum/alumina composites. Four different thicknesses of alumina layers are grown on the substrate using an anodizing process and the microstructural evolution and mechanical properties of the resulting aluminum/alumina composite are investigated. Microscopic investigations of the composite show a uniform distribution of alumina particles in the matrix. It is found that alumina layers produced by the anodizing process neck, fracture, and depart as the number of accumulative Roll Bonding passes increases. During ARB, it is observed that as strain increases with the number of passes, the strength and elongation of the produced composites correspondingly increase. Also, by increasing alumina quantity, tensile strength improves so that the tensile strength of the Al/3.55 vol.% Al2O3 composite becomes ∼3.5 times greater than that of the annealed aluminum used as raw material.
M H Paydar - One of the best experts on this subject based on the ideXlab platform.
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high strength nanostructured al b4c composite processed by cross Roll accumulative Roll Bonding
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2012Co-Authors: Morteza Alizadeh, M H PaydarAbstract:Abstract In the present work, nanostructured Al/B 4 C composites were successfully produced in the form of sheets, through cross Roll accumulative Roll Bonding (CR-ARB) process, at room temperature. The CR-ARB process was performed in two steps. In the first step, the strips were Roll-bonded with a draft percentage of 66% reduction and for the next, the strips were Roll-bonded with a draft percentage of 50%. The later step is consist of 8 Rolling cycles, in which, after every Rolling cycle the specimen was rotated 90°, around normal direction of the Rolling process, and then Rolled again. The X-ray diffraction peak profile analysis was used to determine the crystallite size of the Al matrix in the various cycles. The results showed that CR-ARB process can effectively refine the coarse-grained structure to an ultrafine grain range, so that the crystallite size of the Al matrix of the composite produced by this process was determined to be about 110 nm. To evaluate microstructure of the produced composites, optical microscope (OM) was used. The results proved that the microstructure of the produced composite has a good degree of homogeneity in particles distribution and also a good Bonding created between Al layers. To evaluate mechanical properties of the produced composites, their tensile strength was also determined in various Rolling cycles and compared with the same composites produced by conventional accumulative Roll Bonding (ARB) process.
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fabrication of nanostructure al sicp composite by accumulative Roll Bonding arb process
Journal of Alloys and Compounds, 2010Co-Authors: M. Alizadeh, M H PaydarAbstract:Abstract In the present study, a new manufacturing process for Al–SiC P composites was developed by using bulk aluminum sheets and micron sized SiC particles as starting materials. Nanostructured Al–SiC P composites with average grain size of 180 nm were successfully produced in the form of sheets, through accumulative Roll Bonding (ARB), at room temperature. To evaluate microstructure of the produced composites, scanning electron microscope (SEM) and transmission electron microscope (TEM) were applied. The microstructure of the fabricated composites revealed properly distributed SiC particles in the aluminum matrix. Mechanical properties of the Al–SiC P composites were investigated by the tensile test. The results proved that by increasing ARB cycles the tensile strength of the produced composites increases, but their ductility at first decreases and then increases.
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fabrication of al sicp composite strips by repeated Roll Bonding rrb process
Journal of Alloys and Compounds, 2009Co-Authors: M. Alizadeh, M H PaydarAbstract:Abstract In the present study, Al/SiC P composites were fabricated in the form of strips by repeated Roll-Bonding process, referred as RRB process, at room temperature, successfully. In this process, at first the SiC powders dispersed between the aluminum strips, the strips stacked over each other, and then they were fastened at both end by steel wires and Roll-bonded in a few cycles, with a specific draft percentage of reduction, where the strips were annealed before every Roll-Bonding process. Microstructure of the fabricated composites after seven RRB cycles, showed a well-distributed SiC particles inside the layers with no significant remained porosities between them. The results also proved that the tensile strength of the composites increased with the number of RRB cycles and reached a maximum value of 123 MPa after seventh cycle which is 1.5 times higher than that of the monolithic aluminum produced by the same method.
Danesh H Manesh - One of the best experts on this subject based on the ideXlab platform.
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bond strength optimization of ti cu ti clad composites produced by Roll Bonding
Materials & Design, 2015Co-Authors: M Hosseini, Danesh H ManeshAbstract:Abstract This research focuses on the bond strength of the Ti/Cu/Ti composites fabricated by Roll-Bonding. The peel tests were used to evaluate the bond strength of the clad composites. The Taguchi technique was used to find the optimum conditions to maximize the Cu/Ti bond strength. The optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, as well as peel and microhardness tests were utilized to characterize the interfacial zones. A Taguchi L32 orthogonal array was selected to study the influence of the Roll-Bonding parameters, including the Roller lubrication conditions, temper condition of Cu, Rolling temperature, reduction in thickness, post-annealing time, and post-annealing temperature, and Rolling speed on the bond strength. Based on the Taguchi statistical analysis, the Rolling temperature, reduction in thickness, post-annealing temperature and Rolling speed have significant effects on the bond strength. Among these, the post-annealing temperature is the most effective factor. It was shown that the selection of the highest “reduction in thickness”, the lowest “Rolling speed”, and the intermediate values of “Rolling temperature” and “post-annealing temperature” leads to the highest bond strength. It was also indicated that the mechanism of the Cu/Ti Roll Bonding could be explained using the film theory.
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al ni metal intermetallic composite produced by accumulative Roll Bonding and reaction annealing
Journal of Alloys and Compounds, 2011Co-Authors: A Mozaffari, Morteza Hosseini, Danesh H ManeshAbstract:Abstract In this research, Al/Ni multilayers composites were produced by accumulative Roll Bonding and then annealed at different temperatures and durations. The structure and mechanical properties of the fabricated metal intermetallic composites (MICs) were investigated. Scanning electron microscopy and X-ray diffraction analyses were used to evaluate the structure and composition of the composite. The Al 3 Ni intermetallic phase is formed in the Al/Ni interface of the samples annealed at 300 and 400 °C. When the temperature increased to 500 °C, the Al 3 Ni 2 phase was formed in the composite structure and grew, while the Al 3 Ni and Al phases were simultaneously dissociated. At these conditions, the strength of MIC reached the highest content and was enhanced by increasing time. At 600 °C, the AlNi phase was formed and the mechanical properties of MIC were intensively degraded due to the formation of structural porosities.
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evaluation of mechanical properties and structure of multilayered al ni composites produced by accumulative Roll Bonding arb process
Journal of Alloys and Compounds, 2010Co-Authors: A Mozaffari, Danesh H Manesh, K JanghorbanAbstract:Multilayered Al/Ni composites were produced by accumulative Roll Bonding (ARB) process using Al 1060 and commercial Ni foils. In this process it was observed that nickel layers necked and fractured as accumulative Roll Bonding passes increased. After six ARB passes, a multilayered Al/Ni composite with homogeneously distributed fragmented nickel layers in aluminum matrix was produced. Structure and mechanical properties of these multilayer composites were evaluated at different passes of ARB process. During ARB, it was observed that as the strain increased with the number of passes, the strength, microhardness and elongation of produced composites increased as well. In addition, enhancement of the strength was shown to be higher than the tensile strength of Al/Al and Al/Cu multilayered composites produced by ARB process in the previous works by the same authors.
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mechanism of warm and cold Roll Bonding of aluminum alloy strips
Materials & Design, 2009Co-Authors: M Eizadjou, Danesh H Manesh, K JanghorbanAbstract:From a study of interfacial behavior at deformations up to 60%, a mechanism is proposed for pressure welding of aluminum strips by Rolling at warm and cold conditions, where faying surfaces were first degreased and scratch-brushed. According to this mechanism, the scratch-brushed layers fractured coherently after entering Roll gap at a reduction of approximately 21%, which is regarding to the threshold deformation for Roll Bonding of commercial pure (CP) aluminum strips, and some small cracks perpendicular to the Rolling direction formed. As deformation proceeds and Roll pressure increases, these cracks quickly expanded into fissures. This process allowed the bond to be established between the underlying metals, termed virgin metals, of base metal, which were extruded through the cracks and fissures at the scratch-brushed regions. Moreover by increasing the Rolling temperature, threshold deformation required for bond formation decreases.
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investigation of Roll Bonding between aluminum alloy strips
Materials & Design, 2008Co-Authors: M Eizadjou, Danesh H Manesh, K JanghorbanAbstract:Roll Bonding is a solid-state welding process to join similar and dissimilar metals and a well-established and widely used manufacturing process. In this study, Commercial purity aluminum (AA 1100) strips were Roll-bonded at warm and cold temperatures. Effects of the parameters that create successful bonds such as the amount of deformation by Rolling and Rolling temperature on the bond strength and the threshold deformation between two-layer strips of Al/Al were investigated. The peel strengths of the bonds were measured and found to increase when the Rolling temperature or the thickness reduction are increased, and successful bonds, whose peel strength approached that of the strength of base metal, were created. In addition, the threshold deformation decreased with increasing Rolling temperature.
K Janghorban - One of the best experts on this subject based on the ideXlab platform.
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evaluation of mechanical properties and structure of multilayered al ni composites produced by accumulative Roll Bonding arb process
Journal of Alloys and Compounds, 2010Co-Authors: A Mozaffari, Danesh H Manesh, K JanghorbanAbstract:Multilayered Al/Ni composites were produced by accumulative Roll Bonding (ARB) process using Al 1060 and commercial Ni foils. In this process it was observed that nickel layers necked and fractured as accumulative Roll Bonding passes increased. After six ARB passes, a multilayered Al/Ni composite with homogeneously distributed fragmented nickel layers in aluminum matrix was produced. Structure and mechanical properties of these multilayer composites were evaluated at different passes of ARB process. During ARB, it was observed that as the strain increased with the number of passes, the strength, microhardness and elongation of produced composites increased as well. In addition, enhancement of the strength was shown to be higher than the tensile strength of Al/Al and Al/Cu multilayered composites produced by ARB process in the previous works by the same authors.
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mechanism of warm and cold Roll Bonding of aluminum alloy strips
Materials & Design, 2009Co-Authors: M Eizadjou, Danesh H Manesh, K JanghorbanAbstract:From a study of interfacial behavior at deformations up to 60%, a mechanism is proposed for pressure welding of aluminum strips by Rolling at warm and cold conditions, where faying surfaces were first degreased and scratch-brushed. According to this mechanism, the scratch-brushed layers fractured coherently after entering Roll gap at a reduction of approximately 21%, which is regarding to the threshold deformation for Roll Bonding of commercial pure (CP) aluminum strips, and some small cracks perpendicular to the Rolling direction formed. As deformation proceeds and Roll pressure increases, these cracks quickly expanded into fissures. This process allowed the bond to be established between the underlying metals, termed virgin metals, of base metal, which were extruded through the cracks and fissures at the scratch-brushed regions. Moreover by increasing the Rolling temperature, threshold deformation required for bond formation decreases.
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investigation of Roll Bonding between aluminum alloy strips
Materials & Design, 2008Co-Authors: M Eizadjou, Danesh H Manesh, K JanghorbanAbstract:Roll Bonding is a solid-state welding process to join similar and dissimilar metals and a well-established and widely used manufacturing process. In this study, Commercial purity aluminum (AA 1100) strips were Roll-bonded at warm and cold temperatures. Effects of the parameters that create successful bonds such as the amount of deformation by Rolling and Rolling temperature on the bond strength and the threshold deformation between two-layer strips of Al/Al were investigated. The peel strengths of the bonds were measured and found to increase when the Rolling temperature or the thickness reduction are increased, and successful bonds, whose peel strength approached that of the strength of base metal, were created. In addition, the threshold deformation decreased with increasing Rolling temperature.
