ارزيابي تاثير فشار و دما بر ريزساختار و خواص مكانيكي آلياژ Ti-6Al-4Vتف جوشي شده به روش پلاسماي جرقه اي

In this research, the effects of temperature an‎d pressure variables in the Spark Plasma Sintering (SPS) process on the microstructure an‎d mechanical properties of the Ti-6Al-4V alloy were investigated. The main objective was to optimize the sintering conditions in order to enhance the mechanical properties of the final component. For this purpose, Ti-6Al-4V alloy powder was analyzed using X-ray diffraction (XRD) an‎d X-ray fluorescence spectroscopy (XRF), an‎d 16 samples were sintered for 5 minutes using different combinations of temperature levels (900, 1000, 1100, an‎d 1200 °C) an‎d pressure levels (30, 50, 70, an‎d 90 MPa). After sintering, the samples were again examined using X-ray diffraction to assess their phase composition. The physical an‎d mechanical properties of the samples were also eva‎luated through density measurement an‎d hardness testing. The density of the samples ranged from 4.08 to 4.47 g/cm³, an‎d their hardness varied between 266 an‎d 377 Vickers. Based on the results, the sample produced at 1200 °C an‎d 50 MPa was selec‎ted as the optimal specimen. The microstructure of this sample was examined using optical microscopy an‎d scanning electron microscopy (SEM), an‎d mechanical tests including tensile, compression, an‎d wear tests were performed on it. The results showed that the coefficient of friction at loads of 20 an‎d 70 N ranged from 0.04 to 0.5, an‎d at a load of 50 N ranged from 0.5 to 0.6. Furthermore, the tensile strength, compressive strength, an‎d fracture toughness were obtained as 894 MPa, 1440 MPa, an‎d 170.43 J/m³, respectively. Finally, the mechanical properties of the optimized sample were compared with a sample produced by forging. In the forged sample, the tensile strength was 813 MPa, the density was 4.42 g/cm³, an‎d the hardness was 360 Vickers, which showed lower performance compared to the spark plasma sintering process. These results indicate that the Spark Plasma Sintering process can be an efficient method for producing components with improved mechanical properties in the Ti-6Al-4V alloy.

رضا اميني نجف آبادي

دكتر سيد عرفان عقيلي , دكتر مصطفي ميلاني

دكتر تقي اصفهاني , دكتر حميد اشرفي