Journal of Advanced Materials and Processing: 5 (4)

Open Access Article

1 - Modeling and production of high strength Al strips by equal channel multi angular pressing method
Peyman Keshtiban Mohammad Zadshakouyan Ghader Faraji

Equal channel multi angular pressing (ECMAP) process is the efficient method to enhance the productivity of ultra-fine grained (UFG) materials, by increasing process continuity and as a result decreasing process required time. Comparing repetitive ECAP method, in the sa More

Equal channel multi angular pressing (ECMAP) process is the efficient method to enhance the productivity of ultra-fine grained (UFG) materials, by increasing process continuity and as a result decreasing process required time. Comparing repetitive ECAP method, in the same period, the number of passes can be done by ECMAP. In this article, ECMAP of AL strips in two typical annealed and as received conditions studied, and route C was selected as multi pressing route. Values of equivalent plastic strain (PEEQ) and micro-hardness in the cross section of ECMAPed strips obtained both by FE simulations and practical tests, correspondingly. These values also used for obtaining the inhomogeneity of produced ECMAPed strips. Furthermore, mechanical property for both as received and annealed strips before and after pressing, studied experimentally. Also, load-displacement curve during ECMAP process obtained by FEM. For FEM results validation, PEEQ calculated by the analytical method, too. Results show that there is good conformity between FE, analytical and practical results. Manuscript profile

Open Access Article

2 - Nanoporous anodized aluminum thickness optimization through pulse current mode
Iman Mohammadi Abdollah Afshar Shahab Ahmadi

The purpose of this study was to optimize the thickness of anodizing Aluminum coatings processed under pulse current mode through the Design of Experiments (DOE) method. Thickness measurement, polarization and electrochemical impedance spectroscopy were employed to take More

The purpose of this study was to optimize the thickness of anodizing Aluminum coatings processed under pulse current mode through the Design of Experiments (DOE) method. Thickness measurement, polarization and electrochemical impedance spectroscopy were employed to take Thickness and corrosion behaviors of the anodized coatings into consideration. Also, Field-emission scanning electron microscopy (FE-SEM) was utilized to characterize the surface morphology of the coatings. It was found that the thickness of anodized coatings strongly depends on various parameters among which, time, temperature and pulse current parameters such as current density limit, frequency and duty cycle were considered in the present study. Analysis of variance (ANOVA) was used for estimating the coating thickness. Experimental results showed the maximum value for coating thickness was 62 µm being attained at the maximum and minimum current density of 6.28 and 1.55 A/dm2, a frequency of 150.5 Hz, time of 51 min, duty cycle of 81.5% and the bath temperature of 13.5 oC. Also, FE-SEM observation of the surface of anodized coatings showed that this optimum condition leads to a lower porosity amount. Polarization measurements showed that this lower porosity amount caused an increase in corrosion resistance of anodized coatings. Manuscript profile

Open Access Article

3 - Editorial Board

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Open Access Article

4 - Electrochemical properties of iron oxide nanoparticles as an anode for Li-ion batteries
Mohammad Golmohammad Farhad Golestanifard Alireza Mirhabibi

The synthesis of iron oxide nano-particles by direct thermal decomposition was studied. Simultaneous thermal analysis and Fourier transform infrared spectroscopy results confirmed the formation of iron-urea complex, and disclosed iron oxide formation mechanism. Calcinat More

The synthesis of iron oxide nano-particles by direct thermal decomposition was studied. Simultaneous thermal analysis and Fourier transform infrared spectroscopy results confirmed the formation of iron-urea complex, and disclosed iron oxide formation mechanism. Calcination of the iron-urea complex at 200°C and 250°C for 2 hrs. resulted in the formation of maghemite along with hematite as a second phase. X-ray diffraction results revealed that increment of iron-urea complex calcination temperature led to the augmentation of hematite to maghemite ratio. Field emission scanning electron microscopy and transmission electron microscopy results showed that the average particle size was around 38nm for sample calcined at 250°C for 2 hrs. The anode body was doctor bladed using primary powder with polyvinylidene difluoride and graphite. Galvanostatic charge–discharge cycling showed a reversible capacity of 483 mAh g-1 at 100 mA g−1 current density. The reason for this competent performance was thought to be dependent upon the particle sizes. Manuscript profile

Open Access Article

5 - Optimization of ECMAP parameters in production of ultra-fine grained Al1050 strips using Grey relational analysis
Peyman Keshtiban Mohammad Zadshakouyan Ghader Faraji

Production of lightweight metals with a higher strength to weight ratio is always the main goal of researchers. In this article, equal channel multi angular pressing (ECMAP) process as one of the most appealing severe plastic deformation (SPD) methods on production of u More

Production of lightweight metals with a higher strength to weight ratio is always the main goal of researchers. In this article, equal channel multi angular pressing (ECMAP) process as one of the most appealing severe plastic deformation (SPD) methods on production of ultra-fine grained (UFG) materials studied. Two main routes A and C investigated by FEM and compared with each other from different aspects of view. ABAQUS commercial software used to evaluate the maximum strain, maximum required force and strain inhomogeneity index in both routes and obtained results of FEM verified by both theoretical calculations and experimental tests. It is inferred that although equivalent plastic strain (PEEQ) in route A is higher than that in route C, the strain homogeneity as a quality factor for route C is higher. So, route C selected for more investigation and optimization. Grey relational analysis used as the optimization method. Geometrical parameters taken as input variables and both inhomogeneity index and maximum required load taken as objectives. Then, the suggested tests by full factorial method were simulated by FEM. After optimization, it was concluded that the best set up belongs to experiment number 20 which the values of Φ1, ψ1 and ψ2 are 165°, 0° and 15°, respectively. Also, it is inferred that among geometrical parameters, die channel angle (Φ1) is the most effective parameter. Manuscript profile

Open Access Article

6 - Investigating structural, optical and photocatalytic properties of hydrothermally synthesized ZnO nanorod arrays with various aspect ratios
Saeed Safa Ali Khayatian eliza rokhsat Mehrdad Najafi

ZnO nanorods with various aspect ratios (by changing the time of growth between 0-240 min) were synthesized using hydrothermal method and were investigated using XRD, SEM, UV–Vis and PL. It was found that growth time is directly coupled with the length, orientatio More

ZnO nanorods with various aspect ratios (by changing the time of growth between 0-240 min) were synthesized using hydrothermal method and were investigated using XRD, SEM, UV–Vis and PL. It was found that growth time is directly coupled with the length, orientation and aspect ratio of the nanorod arrays. The optical transmittance of the NR arrays indicated a regular decrement of average transmittance with increasing the aspect ratio of NRs in the visible range. The optical constants (absorption coefficient, extinction coefficient and refractive index) can be account as a function of refractive index were determined. The porous ZnO nanorod with the thickness of &sim; 1560 nm and texture coefficient of 0.96 for (002) plane exhibits the average visible transmittance <60%, refractive index 1.34, packing density 0.26 and lowest optical band gap, was fabricated in the longest time of hydrothermal growth (240 min). As the growth time was increased, the photoluminescence properties was sustained a general weakening tendency and a red-shift of UV-emission peak position. The UV-assisted photocatalytic degradation of 4-Nitrophenol (4-NP) of ZnO NRs were investigated. The considerable photocatalytic performance of ZnO NRs with highest aspect ratio was explained by its porosity and optical characteristics. Manuscript profile

Open Access Article

7 - Alfa- Bismuth(III)oxide catalyzed Biginelli reactions using experimentally designed optimized condition
Mahdi Behzad marzie sabaghian Hamideh samari jahromi

α-Bi2O3 was synthesized via a hydrothermal method at 180 °C for 12 h in 1 (S1) and 2 (S2) M KOH aqueous solutions, using Bi(NO3)3•5H2O as raw material. The synthesized material was characterized by X-ray powder diffraction (XRPD) technique. The XRPD resul More

α-Bi2O3 was synthesized via a hydrothermal method at 180 °C for 12 h in 1 (S1) and 2 (S2) M KOH aqueous solutions, using Bi(NO3)3•5H2O as raw material. The synthesized material was characterized by X-ray powder diffraction (XRPD) technique. The XRPD results indicated that by using 1M KOH aqueous solution, α-Bi2O3 was obtained with small fractions of β-Bi2O3, while 2M KOH solution resulted in pure α-Bi2O3. The α-Bi2O3 was crystallized in a monoclinic crystal structure with space group of P21/c. The size and morphologies of the synthesized material was studied by field emission scanning electron microscope (FESEM). The FESEM images showed that the obtained material had multigonal structures in micron dimensions. The synthesized material was tested as catalyst in Biginelli reactions and excellent performance was achieved in the optimized conditions. Experimental design was used to obtain optimized reaction conditions. Also the optical properties of the obtained material were studied by ultraviolet visible (UV-Vis) diffuse reflectance spectrum (DRS). Manuscript profile

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