چكيده به لاتين
The aim of this study was to investigate the hardness and compressive properties of Al-TiC composite produced by self-propagating high-temperature synthesis. In this experiment, raw materials including the powders of aluminum, titanium and carbon were used. A ball milling was used to mix and homogenize the powders. This powder mixture was obtained in the form of a compact cylinder with different compounds of aluminum, titanium and carbon in the form of xAl + Ti + C. Three cylindrical specimens with 60%, 70% and 80% aluminum weight percentage were prepared. In this study, the synthesis process was performed in an induction furnace in an argon atmosphere under high-speed heating. The formed phases by the combustion synthesis method were examined using X-ray powder diffraction (XRD) analysis and scanning electron microscope (SEM) images. Also, the thermal behavior of the samples was performed using DTA thermal analysis. Based on the results of X-ray diffraction and electron microscope of all three samples, the synthesis was performed successfully. Increasing the amount of T and C reactants result in pure products including Al and TiC being obtained and the intermediate phases 〖Al〗_3 Ti being present in small amounts. By increasing the percentage of composites hard reinforcing particles such as TiC in the aluminum matrix, The hardness and compressive strength of Al-TiC increase compared to their metal matrix. On the other hand, increasing the amount of TiC reinforcing particles intensifies the combustion synthesis reaction. This causes defects such as porosity and cracks in the sample, which negatively affect the mechanical properties of the composite, including hardness and compressive strength. Al-30wt% TiC composite with 80.7 HB hardness and 375 MPa compressive strength shows the best mechanical properties among the samples. The results of thermal analysis show that the synthesis reaction started with the melting of aluminum, With exothermic reactions TiC formation from the Al-Ti-C melt continues through a dissolution-deposition mechanism.
