Improvement of Al-6061 alloys mechanical properties by controlling processing parameters
— this paper discusses the effect of casting processing parameter on the mechanical properties of Aluminum alloy 6061 companied with Al 2 O 3 and Si C P. The specimens were poured in two different mold types one of steel and the other of graphite. These two types have a wide range of cooling rate; steel has fast cooling rate whereas graphite has slow one. In order to investigate this effect, and the alloying elements participation the specimens were taken from three different positions in the mold; top, middle and bottom. The mechanical wear, hardness and microstructure examination were performed. The results showed that wear rate and hardness increase in case of specimen poured in steel mold. This increasing due to fast cooling rate which make refining of the grain size of aluminum alloys. Whereas, their mechanical properties decreased when using graphite molds. In contrast of this result, ductility is increased. This is attributed to that graphite has slow cooling rate (heat dissipate is low) which make enlargement to the grain size of aluminum alloy and the graphite is also solid lubricate playing as interactive lubricate which is main reason to decrease the wear rate.
Complete Design and Assemble of Wind Turbine Bald
the feasibilities of using wind energy in the Kuwait have analyzed and investigated. The wind speed level and resources in Kuwait was investigated experimentally. The aerodynamic of the rotor of wind turbine is investigated experimentally. Aerodynamic of wind turbines is studied theoretical using Flo software based on the theoretical models. All components of wind turbine are selected and manufactured in Kuwait. The required materials for assembling rotor and main shaft were performed. The material of the turbine is investigated for stage of building and assembling.
Thermal stability of an composite processed by powder metallurgy
Abstract The potential of Al Ni 3 Al composites for high-temperature applications, especially when friction is involved, is currently being explored. In this work, the thermal stability of an Al Ni 3 Al composite obtained by extrusion of Al and 5 vol% of spherical Ni3Al powder particles was investigated at temperatures up to 500 °C. The metal/intermetallic composite proved stable up to 300 °C. At higher temperatures, dissolution of Ni3Al particles occurred with formation of concentric layers of Al3Ni and Al3Ni2 phases. The amount of Ni aluminides for each annealing condition was determined by applying a specifically developed mathematical procedure. Dissolution of Ni3Al up to 500 °C was found to obey a parabolic-type law with an activation energy of 156 kJ mol−1. Activation energies for growth of Al3Ni2 and Al3Ni were 209 and 110 kJ mol−1, respectively, in agreement with the literature. The thermal stability shown by this composite makes it a good candidate for high-temperature applications up to 300 °C.