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The mechanical properties of Al-Mg-Si alloys are depending upon many factors such as alloy composition, casting method, heat treatment procedures (solution treatment temperature, aging time and temperature) and other parameters which could affects the aging response and behaviors. In this study, aging response and fracture surface morphology of two Al-Mg-Si alloys with different wt% of Mg and Si compositions of Al-Mg-Si alloys were investigated. The experimental procedures were started with a heat treatment process where firstly both alloy samples were solution treated at 540 �C for 30 minutes, followed by quenched into cold water. The solution treated alloy samples were artificially aged at an elevated temperature of 170 oC for 0.1 to 100 hours. The aging response and mechanical properties were examined by Vickers hardness and tensile test. The surface fractured morphology from the tensile specimen in peak-aged condition at 170 �C was carried out using a field emission scanning el.....

983 hits

? titanium alloys are widely used in orthopaedic applications as an alternative to the high modulus ? + ? titanium alloys which leads to aseptic loosening of implants as a result of the mismatch of the modulus to that of human bone. Hydroxyapatite (HA) coating has been used to enhance the biological properties of Ti alloys. The present study determined the effect of heat treatment on the properties of plasma-sprayed low modulus Ti-13Nb-13Zr alloy using a natural and economical HA derived from fish scales (FsHA) and FsHA-doped yttria stabilized zirconia (YSZ). The microstructure was examined by SEM-EDS and the hardness was determined using Vickers hardness tester whereas the corrosion resistance was studied using potentiodynamic polarization method. The SEM micrograph of the as-coated FsHA revealed micro pores and cracks with partially melted and unmelted FsHA particles while the as-coated FsHA/YSZ samples developed denser coatings, lesser number of pores with increased number of melted.....

1024 hits