Abstract : The effect of various conditions of reinforced and non-reinforced AZ91 alloy on damping performance was investigated in this study. Stir casting was used to synthesize SiC and graphite particles reinforced AZ91 matrix hybrid composites with particle sizes of 25 µm. Each reinforcement quantity was modulated from 0 to 3 weight percent in increments of 1 weight percent. Then heat treatment was carried out on the hybrid composite samples (solutionized and age hardened). The heat treatment condition, weight percent of SiC and graphite particles and temperature were considered as input parameters for determining the optimum damping capacity. The experiments were conducted as per L16 Orthogonal array mixed-level approach. The test outcomes showed that the parameters have a substantial impact on the damping capacity of the composites. The damping tests on cantilever samples were performed with a Dynamic-Mechanical-Analyzer taking temperature levels in between 50-350°C. It was revealed that the optimal damping performance occurred for the heat-treated hybrid composites with increased temperature and reinforcement.