Esmaeil Damavandi

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• Doctor of Philosophy
• Professor (Assistant) at Bu-Ali Sina University

This study examines the impact of the number of equal channel angular pressing (ECAP) passes on the tribological properties of A390 aluminum alloy. Specifically, the investigation focuses on how microstructural features, including the roundness and size of second-phase particles, the volume fraction and distribution of intermetallic compounds, the...

The current study investigated the effect of prior solution treatment and subsequent Equal Channel Angular Pressing (ECAP) on the microstructure and texture evolution of an Al–18 pct Si–4.2 pct Cu alloy. Microstructural analysis revealed that the solution treatment influenced the fragmentation and spheroidization of small particles, thereby limitin...

This study aims to assess the influence of the Mn to S ratios on the machinability and tensile behavior of GG20-gray cast iron brake drums. The effect of various Mn and S contents on microstructural characteristics such as type, size, and aspect ratio of graphite particles, interlamellar spacing of pearlite, and the distribution factor, size, and v...

The objective of the present study is to investigate the effect of chemical composition and microstructure on machinability, mechanical properties, and crack growth of GG-20 gray cast iron for brake drum application. The effects of a reduction in C and Si on microstructural parameters such as type, size, and aspect ratio of graphite particles, inte...

The knowledge of stopper damage behavior under working conditions is highly needed for a better designing them with better properties. Dynamic impact and compression, thermal shock, corrosion, erosion and wear are the main factors affected on the performance of alumina-graphite refractories when they are used as stoppers. This study investigates th...

Advantages of shot blasting machine is the blasting of parts with complex shapes and products having high area to volume. Three important properties of alloys, used as wire mesh, are hardness, high wear resistance, and also proper impact toughness under dynamic loads. Mn steel alloys are the most attractive steel alloys which have possessed the abo...

In order to achieve desired quality of a product by machining, cutting parameters and effective factors should be selected properly. In this research, by utilizing Taguchi method, the optimization of deep drilling process was investigated on AISI-H13, AISI-D3 and Hardened-AISI-1045 workpieces by different tools (HSS, Titanium Coated and Cobalt Coat...

The precipitation behavior during equal-channel angular pressing (ECAP) performed at 400°C in an Al-Si-Cu alloy has been investigated. Meanwhile, grain refinement and tensile properties of solution-treated A390 Al alloy have been studied under various ECAPed passes. Microstructural results showed that during the solution treatment, the high volume...

Al-18%Si-4.5%Cu alloy was processed by route BC equal-channel angular pressing (ECAP) at a temperature of 400 °C. Electron backscattered diffraction (EBSD) was used to analyze the microstructure and microtexture during the ECAP process. The microstructural results showed three important effects: First, the particle-stimulated nucleation (PSN) and c...

In this study, the microstructure, tensile properties, and the fracture behavior of hypereutectic A390 aluminum alloy produced by route BC of equal channel angular pressing (ECAP) were investigated. Microstructural observations showed that the microstructure of the A390 alloy was considerably improved by the ECAP. After the fourth pass, most of the...

In this study, route Bc of the equal channel angular pressing (ECAP) method has been successfully applied to the Al–Si–Cu alloy at 400 °C. Scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) were used to analyze the microstructure. Texture evolution was studied by the X-ray diffraction (XRD) technique. The microstructural...

Microstructure and texture of an Al–Si–Cu alloy subjected to high-temperature equal channel angular pressing (ECAP) were evaluated by electron backscatter diffraction (EBSD). Besides, the inhomogeneity of the ECAP process was investigated in three different zones of ECAPed specimens (i.e., top, center, and bottom). The texture evaluation showed tha...

The dynamic mechanical responses of as-cast and ECAPed hypereutectic Al-Si alloy subjected to high strain rate compression by split Hopkinson pressure bar (SHPB) system were investigated. The result shows that the dynamic yield strength of the investigated alloy first decreases with the first ECAP pass, followed by an increase in strength with furt...

The purpose of the present research is to determine the tensile strength and elongation of the A390 alloy processed by ECAP and to reveal the relationship between the microstructure and tensile properties. Optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used for microstructural analysis of t...

The current work focused on the effect of equal channel angular pressing (ECAP) process on microstructure and texture evolution of A390 aluminum alloy. The alloy successfully processed up to four ECAP passes in route A at 400 °C. The ECAP die, has a circular cross-section channel with a diameter of 12 mm, an inner corner angle, φ, of 110° and an ou...

In the current research, the effect pouring temperature, mechanical vibration of mold, mold temperature and partial remelting on microstructure and mechanical properties of hypereutectic Al-Si alloy was investigated. For designing of experiment, taguchi method is used. Signal to noise ratio and analysis of variance were used for finding optimized p...

In the present study, Al–Al2O3 composites were prepared. Since temperature and time in casting process are two important parameters, in this investigation a method was used to reduce the harmful effects these factors. In addition, in order to study the wettability and distribution of the reinforcement particle, Al2O3 particles were injected into th...

In this research casted Aluminum alloy A356 and Al2O3 powder were used as matrix and reinforcement, respectively. 5wt. % of Al2O3 with Al powder in the ratio of Al/Al2O3=1 for increasing the wettability were milled and injected to melt. Three different argon flow gas rate (2.5, 5, 10 liter/min) were selected for injection Al2O3(p) within molten Al...

In the present study, Al-Al2O3 composites were prepared. Since temperature and time in casting process are two important parameters, in this investigation a method was used to reduce the harmful effects these factors. In addition, in order to study the wettability and distribution of the reinforcement particle, Al2O3 particles were injected into th...

Aluminum/alumina composites are used in automotive and aerospace industries due to their low density and good mechanical strength. In this research, the effect of mechanical stirring of slurry in liquid-solid phase temperature and injection of alumina powder with inert gas (Ar) on microstructure and mechanical properties of Al-A356 alloy is investi...

reasons for decreases in mechanical properties of aluminum metal matrix composites. In this research, to decrease porosity, increase wettability and uniform distribution of particles in matrix three methods were used; using inert gas for injection powder with 5 l/min 􀏐low rate, particles were heat treated at 1100 ̊C for 20 min and Al2O3 particles w...

Presence of porosity and gas layers around the Al2O3 particles are one of the most important reasons of decreasing in mechanical properties of aluminum metal matrix composites. In this research, for decreasing of porosity, increasing of wettability and uniformly distribution of particles in matrix three method were used; using inert gas for injecti...