چكيده به لاتين
Recently, almunim (Al) matrix composites have been considered widespreadly by researchers and manufacturers due to their perfect strength to weigth ratio, low density of base metal, desirable machinability.
The localized corrosion behaviour of aluminium alloys has been widely studied, particularly in the last two decades, by using various characterization tools and techniques. In the present study, the corrosion behaviour of recycled Al chips via powder thixoforging (PTF) is presented. Moreover, the corrosion behaviour of as cast and 520.0 Al recycled chips prepared by PTF in a solution of NaCl 3.5% at 25°C has been investigated by electrochemical polarization test. The Scanning Electron Microscopy (SEM) was used for microstructural investigations. Consequently, compared to as cast condition, the recycled material shows the lower corrosion/ passive current density and larger passive region, indicating the greatly enhanced corrosion resistance
To overcome this defect, producing aluminium matrix composites are a reasonable solution and their corrosion resistance can be controlled. In this study, aluminum/amorphous composite have been produced by powderttixoforging method. Therefore, in this thesis, the behavior of this type of AMCcomposites with focus on corrosion behavior in seawater atmophere. Also, In order to optimize the composites, It should be noted that they were prepared to examine the effect of the reinforcement phase with 15 wt% and 30 wt% amorphous and with different extrusion pressure of 2,3 and 4 MPa and different temperature 500,530 and 560 °C. In general, adding reinforcing particles improves mechanical properties, corrosion resistance, so that aluminium/ 15 wt% amorphous showed better corrosion resistance than 30 wt% due to reduction of corrosion rate.
