MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HYPEREUTECTIC Al-Si/AlNp COMPOSITE

Abstract

Hypereutectic Al - Si alloys with fine and evenly distributed Si precipitates have superior mechanical properties In this study, hypereutectic Al - Si alloy powders which contained 15 and 20wt% Si were prepared by a gas atomization process. 1, 3 and 5wt% AlN particles were blended with the Al - Si alloy powders using turbular mixer. The mixture was consolidated by Hot Press at 550°C for 1h under 60MPa. Relative density of the sintered samples was about 98% of theoretical density. This study was investigated by two ways. One is the effect of reinforcement weight fraction and the other is the effect of Silicon contents on the mechanical properties of the composite. Microstructural characterization and phase evaluation were carried out using X-ray Diffraction, Scanning Electron Microscopy equipped with Energy Dispersive Spectrometer. The results showed that the smaller the reinforcement particle size was and the better its distribution was, the higher ultimate tensile strength and hardness were.

Application of Edible Montmorillonite Clays for the Adsorption and Detoxification of Microcystin

“…Enhanced brood size was also observed with 0.1% SM, 0.2% CM, and 0.2% SM, compared to exposure to MC-LR for 48 h. The increase in brood size in the nematodes after clay treatment may be contributed to the role of cationic ions such as calcium signaling in fertilization, sperm activation, and meiotic maturation of oocytes. [76][77][78] These results indicate that the treatment with 0.1% or 0.2% of CM or SM for 2 h reduced the toxicity from exposure to MC-LR for 24 and 48 h in a dose-dependent manner. The C. elegans results supported our in vitro, in silico, hydra, and lemna results, indicating that CM and SM are effective binders of MC-LR and can reduce the toxicity of MC-LR in a dose-dependent manner.…”

Enhancing Properties of Cast Al Alloys by Rheocasting and Nano-Dispersions

“…The microstructural features of the prepared material obtained through this work are shown in figs. (7)(8), where the influence of nano-particles addition is evident. The microstructure clearly indicates the presence of aluminum dendrites which tend to be spherodised in some areas after semi-solid casting and stirring.…”

“…Moreover, it is shown from the micrograph (13 a) that the eutectic silicon has two morphologies, one is present in spaces between α-Al dendrite arms and it can be found to be fine, skeleton network with Chinese script morphology [9]; the second one can be found around the primary silicon particles and it is in the shape of flakes 13 b). Table (7) and Figure (14) show the influence of nanoparticles addition on some microstructure features namely; dendritic arm length, interdendritic arm spacing and interlamellar spacing in the eutectic silicon phase.…”

“…Preliminary investigations [1][2][3][4] show that introducing nano-ceramic particles to (A356) has a beneficial effect on optimizing strength -ductility relationship in these alloys. Recent studies [5][6][7] also shows enhancements in strength, hardness, and tribological properties of hypereutectic Al-Si alloy (A390) by introducing reinforcement ceramic particles and it was concluded that as the reinforcement particles size goes smaller their effect is much more beneficial.…”

Experimental investigations on combustion, performance and emissions characteristics of compression ignition engine powered by B100/ethanol blend

“…B100 can be burned in diesel engine and it can be mixed with other fuels such as diesel or oxygenated fuels. Authors [6] investigated the diesel engines fuelled with 20% biodiesel-diesel blended fuel. The study revealed that the maximum torque achievable with the biodiesel-diesel blended fuel was slightly lower than that achievable with neat diesel fuel at high-load conditions.…”