Effect of Microstructural Refinement on Tensile Properties of AZ80 Magnesium Alloy via Ca Addition and Extrusion Process
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): S.H. Allameh, M. Emamy, E. Maleki, B. Pourbahari The microstructure and tensile properties of AZ80+X%Ca (X=0, 0.1, 0.5) magnesium alloy have investigated after applying extrusion process at 280°C and 340°C. Optical and scanning electron micrographs parallel to extrusion direction at 280°C showed dynamically recrystallized grains. There were also initial grains elongated in extrusion direction in the AZ80+X%Ca alloy. Finer microstructures were observed by increasing calcium content due to the formation of some precipitates during g...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Significant Increase in Tensile Strength and Hardness in 2024 Aluminum Alloy by Cryogenic Rolling
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): A. Shahsavari, F. Karimzadeh, A. Rezaeian, H. Heydari Because of high strength to weight ratio and good resistance to corrosion, 2024Al alloy has attracted a high attention in the aerospace and shipbuilding industries. Most of the research activities to grain refinement lead to decrease in ductility. In this article, the researchers have developed a novel approach in achieving both high strength and good ductility in 2024 Al alloy. The approach involves Solid solution-treating, rolling at cryogenic temperature (containing a high dens...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
The Effect of Si and Extrusion Process on the Microstructure and Tensile Properties of Mg-Mg2Si Composite
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): S. Mosleh, M. Emamy, H. Majdi This investigation has been carried out to study the influence of extrusion process on microstructure and tensile properties of Mg-Mg2Si composite with different amounts of Si (3, 5 and 7wt.%). Microstructural examination was carried out using optical microscopy (OM). The cast specimens were extruded at 350°C at different extrusion ratios (6:1, 12:1 and 18:1). The results showed that the specimens with lower Si contents, have higher ultimate tensile strength (UTS) and tensile elongation values. Moreover, ...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Fatigue Behavior of Friction Stir Welded Joints of Pure Copper with Ultra-fine Grains
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): S. Salahi, G.G. Yapici In order to determine the long term durability of friction stir welded joints with ultra-fine grained microstructure, investigation of the mechanical response with specific emphasis on fatigue behaviour is critical. In this paper, fatigue behavior of friction stir welded joints of pure copper in low cycle; strain-controlled regime was investigated. Microstructural characterizations indicated the formation of recrystallized ultrafine-grained microstructure in the nugget zone (NZ) after friction stir welding. Fatigue...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Evaluation of Mechanical Properties and Structure of 1100-Al Reinforced with Zro2 Nano-particles via Accumulatively Roll-bonded
In this study, aluminium metal composites reinforced with Zirconium dioxide (ZrO2) nano-particles in different of volume percentage are manufactured through accumulative roll bonding. The results indicate that with the application of 10 ARB cycles and the composite microstructure shows excellent ZrO2 particle distribution in the Al matrices. The X-ray diffraction results also showed that nanostructured Al/ZrO2 Nanocomposite with the average crystallite size of 48.6nm was successfully achieved by employing 10 cycles of ARB process. According to the results of this study, the tensile, hardness, and elongation properties of t...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Effects of Thermo-mechanical Processing on the Mechanical Properties and Shape Recovery of the Nanostructured Ti50Ni45Cu5 Shape Memory Alloy
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): M. Abbasi, A. Kermanpur, R. Emadi The main purpose of this research is to evaluate effects of the thermo-mechanical treatment of cold rolling followed by annealing on microstructure and shape recovery of the nanostructured shape memory Ti50Ni45Cu5 alloy. Several samples were produced by the copper-boat vacuum induction melting technique. The as-solidified samples were homogenized and hot rolled at 900̊C. The hot rolled samples were then cold rolled up to 70% thickness reduction followed by annealing at 400 ̊C for 1h. The microstructu...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
The Effect of La-intermetallic Compounds on Tensile Properties of Al-15%Mg2Si In-situ Composite
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): A. Akhlaghi, M. Noghani, M. Emamy In this work, an attempt was made to examine the effect of different La-intermetallic on the microstructure and tensile properties of Al-15%Mg2Si metal matrix composite (MMC). The composite was made via in-situ process and characterized by optical microscope (OM), scanning electron microscope (SEM) equipped with energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analysis. Microstructural characterization revealed that La changes not only the morphology of primary Mg2Si particles fro...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Effect of Sicp on the Microstructure and Mechanical Properties of Sintered Distaloy DC Composites
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): K. Emre Öksüz, L. Cenk Kumruoğlu, O. Tur Different PM steels have found applications, mainly in the automotive industry for engine and transmission systems. In this paper examined in research on the microstructure and mechanical properties of Distaloy DC + 0.5%C + %0.6 introlube® with addition the silicon carbide. Specimens were prepared from diffusion alloyed Distaloy DC (Fe-2wt. % Ni-1.5wt. % Mo) mixed with graphite. SiCp in proportion to 0.5 and 1wt % was added to the powder-graphite mixtures. In this work the Distaloy DC+ 1wt %...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Phase and Morphological Evaluation of Mechanically Activated Sintered YAG Powders
In this study, YAG phase was formed successfully with mechanical activation of powder mixtures. The powders were compacted and sintered at 3 different temperatures to evaluate the sintering density, phase formation and grain morphology. It was found that increasing activation time increases the relative density according to unactivated sample sintered at same temperatures. The 80% of theoretical density was reached which indicates the partial liquid phase formation took place. Experiments for further investigations are carried on. (Source: Procedia Materials Science)
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Effect of Hot Extrusion on Microstructure and Tensile Properties of Ca Modified Mg-Mg2Si Composite
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): M. Lotfpour, M. Emamy, S.H. Allameh, B. Pourbahari Effect of 0.05, 0.1, 0.5, 1 and 3 (wt. %) Ca addition and extrusion process on the microstructure and tensile properties of Mg-Mg2Si metal matrix composite has been studied by the use of optical microscopy (OM) and standard tensile testing. The average size of primary Mg2Si particles decreased from 34μm to about 10μm with the addition of 0.05 (wt.%) Ca and extrusion process and also the size of eutectic Mg2Si decreased from 20μm to about 2μm. The morphology of Mg2Si particles alt...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Investigation the Effect of Al-5Ti-1B Grain Refiner and T6 Heat Treatment on Tensile Properties of Al-8%Mg
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): A. Amerioon, M. Emamy, Gh. Ashuri The current study was undertaken to study the effect of different amounts of Al-5Ti-1B master alloy (0.01, 0.03, 0.05, 0.1, 0.3, 0.5, 1% weight percent) and T6 heat treatment on the microstructural evolution and mechanical properties of Al-8%Mg alloy. Microstructural assessment was carried out by optical microscopy (OM) and scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS) analysis. Obtained results showed that the addition of Al-5Ti-1B master alloy obviously improve...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
The Effect of Strain Rate on Ultra-fine Grained Structure of Cold Drawn 304L Stainless Steel Wires
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): P. Parnian, M.H. Parsa The effect of strain rate on nano structured and ultra-fine grained microstructure in austenitic stainless steel AISI 304L was investigated during cold wire drawing process. This process was used to produce strain induced martensite transformation and then samples were annealed to create reversion in examined material. Samples were subjected to two different strain rates of 0.41 and 1.032 s-1 with relatively heavy imposed cold drawing of 1.13 strain. Best condition of subsequent annealing were obtained from experim...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Microstructural and Mechanical Properties of Nano/Ultra-fine Structured 7075 Aluminum Alloy by Accumulative Roll-Bonding Process
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): H. Alvandi, K. Farmanesh In this paper, microstructure and mechanical properties of Nano/ultra-fine structured 7075 Aluminum alloy were investigated by accumulative roll bonding process at room temperature. After the accumulative roll bonding, the tensile yield strength, ultimate strength and microhardness of the Nano/ultra-fine structured 7075 Aluminum alloy were 216%, 114%, and 122% higher than those of the coarse-grained samples, respectively, while elongation to failure was lower than the primary sample. The elongation to failure dec...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Effect of Pin Profile on Defects of Friction Stir Welded 7075 Aluminum Alloy
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): S.M. Bayazid, H. Farhangi, A. Ghahramani In this work, effect of the pin profile on defects of FSWed 7075 alloy was investigated. Three pins with cylindrical, square and triangle geometry were used for welding. Microstructure of the welding zone showed that the tunnel hole produced by triangle pin has smaller dimensions compared to cylindrical pin. On the other hand, results of optical microscope indicated that the size of grains resulted from square pin is smaller than the other kinds of tools. Also, the results showed that when the p...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
Investigation of Friction Stir Welding Parameters of 6063-7075 Aluminum Alloys by Taguchi Method
Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): S.M. Bayazid, H. Farhangi, A. Ghahramani In this work, effect of some welding parameters such as rotational speed, travel speed and plates’ position on microstructure and mechanical properties of Friction Stir Welded joint of 6063 and 7075 alloys was predicted via Taguchi method. Signal to Noise ratio (S/N) analysis indicated that maximum tensile strength achieved when rotational and travel speeds, and plates’ position were chosen as 1600rpm, 120mm/min and Al7075 in advancing side (AS-7075), respectively. According to ANOVA analysi...
Source: Procedia Materials Science - November 8, 2015 Category: Materials Science Source Type: research
