Damping capacity of magnesium matrix composites fabricated by ultrasonic-assisted stir casting

In this study, the ultrasonic-assisted stir casting technique was utilized to produce magnesium (Mg) composites, wherein silicon nitride (Si 3 N 4 ) particles were incorporated in low proportions. The primary aim of this investigation was to examine the effect of introducing these Si 3 N 4 particles in small amounts on the damping capability of pure Mg. Examination of the scanning electron microscope images verified that the Si 3 N 4 particles were uniformly dispersed with minimal agglomeration. The damping capacity of both pure Mg and the composites was assessed at room temperature using a resonance frequency damping analyzer. The findings indicated that the inclusion of Si 3 N 4 particles amplified the damping capacity of pure Mg. Remarkably, the Mg/Si 3 N 4 composite demonstrated the highest damping capacity, surpassing that of pure Mg by 1.5 times.