Parviz Asadi

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Verified

Parviz verified their affiliation via an institutional email.

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• PhD
• Professor (Associate) at Imam Khomeini International University

Hydroxyapatite (HA) coatings are commonly used on titanium alloy substrates for orthopedic and dental implants because of their excellent osteoconductivity and biocompatibility. The disparity in the coefficient of thermal expansion (CTE) between the coating and substrate can result in the formation of cracks in the HA coatings during the coating pr...

Material flow pattern determination during Friction Stir Processing (FSP), while producing a composite substrate is one of the most challenging factors in achieving uniform distribution of reinforcements. This article investigates the effects of pin thread and thread pitch on the distribution of reinforcing particles during the FSP process. It is m...

This study investigates the impact of Flat-Surfaced Pin geometry on temperature, strain, particle distribution, and material flow during Friction Stir Processing (FSP) using a Coupled Eulerian-Lagrangian (CEL) formulation. Various models incorporating different pin shapes—cylindrical, square, and hexagonal—were developed for this purpose. To invest...

Friction stir extrusion (FSE) is a versatile technique that plays a dual role in sustainable recycling and shaping of materials. This method involves a rotating mandrel and a fixed matrix within a mold, where compressed waste metal chips or primary bulk materials are introduced. The rotating mandrel exerts continuous axial pressure, generating fric...

The purpose of this study was to examine the potential impact of the testing procedure, the shape of the test sample, loading method and sample size on the KIc value of polymer concrete (PC) materials. The research involved experimental investigations using five different testing techniques and specimen types, namely the single edge notched beam (S...

Friction Stir Extrusion (FSE) is applied on the as-cast LM13 aluminum alloy to produce tubes accompanied with the microstructural modification. Then, the process was employed to transform LM13 to LM28 alloy by mechanical alloying by adding Si particles during the process. In addition, a numerical model on the Deform 3D software is developed to simu...

Friction stir welding (FSW) is a manufacturing process that many industries have adopted to join metals in a solid state, resulting in unique properties. However, studying aspects like temperature distribution, stress distribution, and material flow experimentally is challenging due to severe plastic deformation in the weld zone. Therefore, numeric...

Employing numerical methods to simulate manufacturing processes and study their influential factors is increasing. The development of computers and engineering software has increased the ability and accuracy of numerical methods in simulating various aspects of different processes. One of the manufacturing processes that has been considered by many...

Friction Stir Extrusion (FSE), the focus of this research, is a process that has tremendous potential for shaping and improving the mechanical properties of the final product as well as the mechanical alloying. In this study, a cylindrical sample of LM13 aluminum, to which silicon powder is added, is extruded by the penetration of a tool and takes...

In this paper, A356/B 4 C composites were fabricated using the friction stir processing (FSP) method. The process’s input parameters, including rotational and transverse speed, were optimized using the response surface methodology (RSM). Three factors and three levels with nine experimental runs made up the design of the experiments. An analysis of...

This paper investigates the microstructural and mechanical properties in the joining of aluminum sheets using the friction stir welding (FSW) method. First, the microstructural properties are investigated, and then the effect of process parameters on the grain size, defect formation, microhardness, and fracture energy is discussed. The grain size i...

Al–Si alloys are commonly utilized in the production of automobile components, including pistons and cylinders. Although this alloy offers desirable features for usage in pistons, several microstructural characteristics, such as the presence of needle-like silicones or dendrites, impair the performance of the parts produced. In this study, TiC rein...

This study investigates the effects of tool traverse and rotational speeds in the friction stir back extrusion (FSBE) process on the microstructural and mechanical properties of brass wires produced. The microstructural properties were examined by microscopic tests and the mechanical properties of the wires by hardness and pressure tests. The mater...

In this study, to explore the dispersion of particle reinforcement in the base metal, aluminum-6061/SiC composites were made utilizing friction stir processing (FSP) tools with various probe profiles such as cylindrical, triflate, square, triangular, and hexagonal. A light microscope was used to examine the dispersion of SiC particles in the compos...

The Coupled Eulerian-Lagrangian (CEL) technic is used for numerical modeling of the bobbin tool friction stir welding (BTFSW) of magnesium alloy. Temperature and force history curves are used to validate the numerical model. To investigate the impacts of pin shapes, researchers used a variety of tools with square, trigonal, inward conical, hexagona...

In the present work, the effects of in-process cooling are investigated on the material flow, temperature distribution, axial force, wear resistance, and microstructural and mechanical properties of friction stir processed (FSPed) Al-Si aluminum alloy. The finite element method (FEM) was developed for modeling the process, based on the eulerian-lag...

Friction stir back extrusion (FSBE) is used to produce brass wires, and then numerical modeling is developed to model the process by the coupled Eulerian-Lagrangian (CEL) technique and verified by experiments. Next, the effects of FSBE parameters, including tool rotational and plunging speed, on the strain and temperature distributions, microstruct...

Multi-walled carbon nanotube/aluminum composites are fabricated on Al–Si cast alloy employing friction stir processing. First, the microstructure of the stir zone, as well as the effect of process parameters on the size of silicon particles, is investigated. Then, the process is numerically simulated using a thermo-mechanically coupled three-dimens...

Friction stir back extrusion is used to produce brass wires from its chips, and then the process parameters are optimized using Taguchi L9 orthogonal design of experiments. The rotational speed, traverse speed, and the produced wire diameter are the parameters taken into consideration. The optimum process parameters are determined with respect to g...

Friction stir back extrusion (FSBE) is used to produce brass wires and then, Numerical modeling is developed to simulate the FSBE of brass based on the Coupled Eulerian-Lagrangian technique (CEL) and verified by experiments. Next, the effects of FSBE parameters such as tool rotational and plunging speed on the strain and temperature distributions,...

Dissimilar friction stir welding of metals is crucial in terms of inter-material mixing and the intermetallic compound formation which affects the achieving a sound joint with fine mechanical properties. In this investigation, the formation of intermetallic compounds along with the material flow during friction stir lap welding (FSLW) of aluminum a...

In this study, in order to obtain the maximum possible formability in tailor-welded blank AA6061 sheets connected by the friction stir welding (FSW) procedure, the incremental sheet forming process has been utilized. The results are presented both numerically and experimentally. To obtain the forming limit angle, the base and FSWed sheets were form...

A numerical investigation is provided to study the residual stress states in multi-pass TIG welding of stainless steel SUS304 pipe. An uncoupled thermomechanical three-dimensional finite element model is developed using the ABAQUS software for a circular weld design around the pipe. The effects of weld pass numbers, electrode moving speed, and heat...

The Coupled Eulerian Lagrangian (CEL) method is utilized to model the double shoulder friction stir welding (DSFSW) of AZ91 magnesium alloy and then the model is verified by the experiments. The effects of tool rotational speed and sheet thickness on temperature and strain distributions as well as the material flow patterns are considered at differ...

The intermetallic compounds formation and inter-material mixing have a critical impact on achieving a sound joint with fine mechanical properties in the case of dissimilar metal friction stir welding. In this investigation formation of intermetallic compounds as well as material flow that results in inter-material mixing during friction stir lap we...

A numerical procedure is provided to analyze temperature and residual stress fields in multi-pass TIG welds with different pipe and electrode material. Based on the ABAQUS software and FORTRAN codes, to appraise the temperature fields and the residual stresses over the TIG process, an uncoupled thermo-mechanical, finite element model (FEM) is devel...

The double shoulder friction stir welding of AZ91 magnesium alloy is numerically modeled based on the Eulerian method using the ABAQUS software. The material flow in the integrated form is demonstrated properly and the shoulder driven and pin driven zones are predicted very well. The effects of pin profile on the temperature and strain distribution...

The thermo-mechanically affected zone (TMAZ) is an exclusive zone formed in friction welded joints as a transition zone between the stir zone (SZ) and the heat affected zone (HAZ). This zone is crucial from the mechanical and microstructural aspects. In this work, the formation of TMAZ and its morphology in different friction stir welded and proces...

In this investigation, A356 aluminum pipes were successfully welded using friction stir welding (FSW) method and the process parameters and tool design were optimized using Taguchi method. The small radius of curvature distinguishes this weld configuration geometrically from a butted plate configuration and presents unique challenges. For this reas...

In this paper, formability of dissimilar friction stir welded AA 6061 and AA 5083 blanks during single point incremental forming (SPIF) is investigated numerically and experimentally. Sheets from AA6061, AA5083 and FSWed AA6061 to AA5083 are formed by SPIF with different cone angles, and the limiting wall angles are determined. Additionally, the ef...

A356 alloy was used as the base metal to produce boron carbide (B4C)/A356 composites using friction stir processing (FSP). The microstructural and mechanical properties of B4C/A356 composites were optimized using artificial neural network (ANN) and non-dominated sorting genetic algorithm-II (NSGA-II). Firstly, microstructural properties of the comp...

To improve the wear resistance of Al-Si alloys, different types of reinforcing particles such as SiC, TiC, ZrO2, and B4C were used to produce matrix composites by friction stir processing (FSP). First, microstructural properties of different locations of stir zone (SZ) in the FSPed specimens such as advancing side, retreating side, shoulder-affecte...

Fabrication of particle-reinforced aluminum matrix composites has been pursued with a keen interest recently. However, a comparison of the effect of different reinforcements on the mechanical properties and wear resistance of A356 matrix composites fabricated by FSP is of great interest to be considered. In the present work, the microstructural, me...

In this investigation, the mechanical and microstructural properties of aluminum composites reinforced by different reinforcing particles including SiC, TiC, ZrO2, and B4C were optimized using neural network and NSGA-II. In order to obtain the best microstructural and mechanical properties of aluminum composites, different friction stir processing...

Aluminum-base surface hybrid composites have been fabricated by mixtures of SiO2 and Al2O3 particles on an Al–Si cast aluminum alloy using friction stir processing with the aim of achieving higher wear properties in the Al piston alloy via surface hybrid composites fabrication. The distribution of particles in the stir zone was evaluated via scanni...

Boron carbide /aluminum composites have been produced on an aluminum–silicon cast alloy using friction stir processing. Effect of pin profile on the distribution of boron carbide in the stir zone of the friction stir processed specimens was investigated experimentally and numerically. The material flow generated by the threaded and circular tool pi...

To predict the grain size and microstructure evolution during friction stir welding (FSW) of AZ91 magnesium alloy, a finite element model (FEM) is developed based on the combination of a cellular automaton model and the Kocks − Mecking and Laasraoui–Jonas models. First, according to the flow stress curves and using the Kocks − Mecking model, the ha...

In the present research, a continuum-based thermo-mechanically coupled rigid-viscoplastic finite element model is proposed in Deform-3D software to simulate the friction stir welding (FSW) of AZ91 magnesium alloy. Then, to consider the microstructure evolution of the weld zone, a model is established based on the combination of cellular automaton a...

Background Recently, some researchers have simulated FSW using FEM and studied the influence of process parameters and tool geometry on material flow, welding force, and temperature and strain distributions during friction stir processing. Additionally, in terms of microstructure modeling, various approaches such as the Cellular Automaton (CA) mode...

In this research, AZ91 alloy sheets were joined using friction stir welding and the process parameters were optimized using Taguchi L27 orthogonal design of experiments. The pin shape, rotational speed, traverse speed, shoulder diameter, penetration depth, pin diameter, tool tilt angle, and shoulder concave angle were the parameters taken into cons...

Some metal alloys are difficult to weld and some types of defects are formed during (fusion) welding and casting, including porosity and solidification cracking, which have significant influence on mechanical properties of the joints. Therefore, the repair welding process of defect-existent joints and products attracts much attention. FSW, as a sol...

This first chapter of the book gives a general introduction to the chronological development of different welding methods in fusion and solid-state categories. Then the different solid-state friction welding (FW) methods are explained, with the emphasis on friction stir welding and its required tools and resulting microstructure. Advantages and dis...

The artificial neural network (ANN) can be used as a model for friction stir welding (FSW), predicting the correlation between FSW parameters and weld properties. ANN for predicting properties of welded plates by FSW is explained and pervious works in this field are reviewed. Furthermore, some examples about applications of ANN in FSW are presented...

During recent years, friction stir processing (FSP) has become known as a beneficial method for mechanical alloying (MA). High inserted heat and strain during FSP can be applied to produce in situ intermetallics and modify the microstructure of alloys by increasing the alloying elements. These fabricated materials by FSP have shown an improvement i...

Friction stir welding (FSW) is a solid-state joining technique that was initially applied to aluminum alloys, but nowadays is widely used in many different industrial applications. The process has many advantages in both mechanical properties of the welded material and the energy consumption which directly leads to lower operating costs. FSW can be...

Friction stir welding/processing (FSW/FSP) of metals and their alloys has been investigated widely in recent years. The microstructure of alloys affects the mechanical and physical properties of processed materials and joints, therefore studying microstructure evolution during FSW/FSP of alloys is necessary. Recent investigations show that dynamic...

FSW/FSP results in intense plastic deformation and temperature increase within and around the stir zone. FSW is based on strong couplings of thermo-mechanical phenomena. An understanding of mechanical and thermal processes during FSW/FSP is needed for optimizing process parameters and controlling microstructure and properties of welds. Still an und...

In this study, microstructural and mechanical properties of friction stir welding (FSW) of AA1100 is optimized using Taguchi L9 orthogonal design of experiments. First, in order to study the microstructural properties of the weld, microstructure evolution of the weld zone is simulated with the cellular automaton (CA) method coupling the modified La...

In this study the inuence of rotational and traverse speed on the friction stir welding of AA5083 aluminum alloy has been investigated For this purpose a thermo-mechanically coupled, 3D FEM analysis was used to study the effect of rotational and traverse speed on welding force, peak temperature and HAZ width. Then, an Articial Neural Network (ANN)...

In this study, the effect of tool pin profile on mechanical properties, microstructural, material flow, thermal and strain distributions of friction stir welding of AA5083 was investigated. Two different tools with cylindrical and square pin profiles were employed to produce the welds. A numerical model is developed for investigating the effect of...

Friction-stir welding (FSW) is a solid-state joining process primarily used on aluminum, and is also widely used for joining dissimilar metals such as aluminum, magnesium, copper and ferrous alloys. Recently, a friction-stir processing (FSP) technique based on FSW has been used for microstructural modifications, the homogenized and refined microstr...

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Electrical resistance variations of Ni50.9Ti49.1 shape memory wires were studied during aging treatment at different temperatures via in-situ electrical resistance measurement. The results showed that during aging treatment, a cyclic behavior was observed in the electrical resistance variations, which could be related to the precipitation process....

This paper deals with an experimental investigation focused on the effects of water cooling treatment, friction stir processing pass number, and tool rotational direction on the microstructure and mechanical properties of friction stir processed AZ91 magnesium alloy. Specimens were produced using different combinations of process parameters. Parall...

This paper deals with an experimental investigation focused on the effects of water cooling treatment, friction stir processing pass number, and tool rotational direction on the microstructure and mechanical properties of friction stir processed AZ91 magnesium alloy. Specimens were produced using different combinations of process parameters. Parall...

The objective of the current paper is using DEFORM-3D software to develop a 3-D Lagrangian incremental finite element method (FEM) simulation of friction stir processing (FSP). The developed simulation allows prediction of the defect types, temperature distribution, effective plastic strain, and especially material flow in the weld zone. Three-dime...

Composite sandwich panels with high stiffness to weight ratios are mostly used in the transportation, aerospace, and marine structures. In this study, the possibility of manufacturing the sandwich panels by vacuum-assisted resin transfer molding without using the distribution media is experimentally investigated. These structures are comprised of E...

In the present study, SiC nanoparticles were added to as-cast AZ91 magnesium alloy through friction stir processing (FSP) and an AZ91/SiC surface nanocomposite layer was produced. A relation between the FSP parameters and grain size and hardness of nanocomposite using artificial neural network (ANN) was established. Experimental results showed that...

In the present study, friction stir processing was used to transform the surface of eutectic LM13 Al–Si alloy into a modified hypereutectic alloy by addition of 10% volume fraction Si particles. Particle distribution, microstructure, hardness and tensile properties of the stirred zone were studied as functions of tool geometry, FSP pass number, and...

Friction stir processing (FSP) is an effective tool to produce a surface composite layer with enhanced mechanical properties and modified microstructure of as-cast and sheet metals. In the present work, the mechanical and microstructural properties of as-cast AZ91 magnesium alloy were enhanced by FSP and an AZ91/SiC surface nanocomposite layer has...

In this study, friction stir processing (FSP) was employed to develop a composite layer on the surface of as-cast AZ91 magnesium alloy using SiC particles (5μm and 30nm). The effects of the rotational and traverse speeds and the FSP pass number on the microstructure and microhardness of the friction stir processed (FSPed) layer with and without SiC...

In this research, nanosized SiC and Al2O3 particles were added to as-cast AZ91 magnesium alloy, and surface nanocomposite layers with ultrafine-grained structure were produced via friction stir processing (FSP). Effects of reinforcing particle types and FSP pass number on the powder distribution pattern, microstructure, microhardness, and on tensil...

A thermo-mechanical simulation of the friction stir processing (FSP), using the DEFORM 3D software based on Lagrangian implicit, was developed and verified by the experimental results. Simulation can successfully predict the temperature and effective strain distributions. Material flow around the tool pin was examined using the point tracking. It w...

Friction stir processing (FSP) was applied to modify the microstructure of pure copper and Cu/SiC nanocomposite layers. Optical and scanning electron microscopy (SEM) was employed to investigate the microstructure on the modified surface. Also, the wear resistance and friction coefficient behavior of specimens were investigated. FSP homogenizes and...

In this study, friction stir processing (FSP) was applied to fabricate a Cu/SiC surface composite layer by incorporation of 5 µm SiC particles. Effects of the traverse speed and SiC volume fraction on the microstructure, hardness and powder distribution pattern of the developed surface layer were investigated. Optical and scanning electron microsco...

The microstructures, wear property and micro-hardness of AZ91 Mg alloy/alumina particle reinforced nano-composite produced by friction stir processing (FSP) were investigated. The initial microstructures of the AZ91 were composed of irregularly distributed β-phases (Al12Mg17), while the FSPed specimens were characterized by the homogeneous distribu...

a b s t r a c t In this experiment, copper-base composites reinforced with 30 nm and 5 m SiC particles are fabricated on the surface of a purecopper sheetvia friction stir processing (FSP). Microstructure, mechanical prop-erties and wear resistance of friction stir processed (FSPed) materials are investigated as a function of volume fraction of SiC...

Iranian Patent Number: 41994

In this investigation SiC particles were added to as-cast AZ91 magnesium alloy and AZ91/SiC surface nanocomposite layer with nano-grain structure was produced via friction stir processing (FSP). Effects of process parameters, such as the rotational and traverse speeds, the FSP pass numbers and the rotational direction of FSP tool on the powder dist...

Friction stir processing (FSP) was used to fabricate SiC/AZ91 composite layer. Effect of process parameters such as rotational and traverse speeds, tool penetration depth and tilt angle on the formation of defects such as cracks, tunnelling cavity and also on sticking of matrix material to the tool was investigated. Also, effect of these parameters...

AZ91 Magnesium alloy was subjected to friction stir processing (FSP). The microstructural analyses of the friction stir processed (FSPed) specimens were carried out and the effects of pass number, rotational speed, and traverse speed upon thermo-mechanically affected zone (TMAZ) were investigated. The TMAZ is consisted of a region with highly elong...

Compared to the many fusion welding processes that are routinely used for joining stainless steel 316L, the friction stir welding (FSW) process is an emerging solid state joining process in which the material that is being welded does not melt and is being recast. The welding parameters play a major role in deciding the weld quality. In this invest...