عنوان مقاله [English]
In this study, effects of main squeeze casting parameters, including squeezing pressure, super-heat and the duration of pressure on the microstructure, mechanical properties and wear behavior of A356 aluminum alloy were investigated. For this purpose, the parameters were evaluated in three levels on the hardness, yield strength, ultimate tensile strength, elongation and weight loss were examined. Squeeze casting process was performed using 20 Ton hydraulic press equipped with a tool steel die having cylindrical cavity. Microstructural studies were evaluated by optical and electron microscopy. The wear test was performed by a pin on disk unit to 2000m wear distance at constant condition. The results showed that the squeezing pressure causes the alpha-aluminum dendrites and eutectic cells to be finer in the microstructure and reduce the casting defects. Also, the squeezing pressure, the duration of pressure and the super heat, have the most influence on the mechanical properties and wear resistant, respectively. By increasing the pressure from 60 to 90 MPa and above, the adhesive wear- mechanism is weaker compared to the abrasive and the wear type is found to convert the low stress wear from high stress state, which improves the wear resistance. At least 90 MPa squeezing pressure, at least 30 seconds duration for applying the pressure and a super-heat of 50 to 100 °C are the recommended ranges for achieving the best wear resistance and mechanical properties.
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