The damping capacity of a material refers to its ability to convert mechanical vibration energy into thermal energy or other energies. The damping capacity is very important to some materials, especially the structural materials. It is well known that mechanical vibration causes much damage in aerospace industry, automotive industry and architectural industry. So, it is urgent to seek for high damping capacity materials to eliminate the damage. Since the specific gravity of Aluminum is approximately 2.7 g/cc, the composites of Aluminum play a very significant role in light weight machine components. Silicon, copper, magnesium, iron, manganese, and zinc are important elements in Aluminum composites. The properties of these alloys can be prepared and these readily can be used in design engineering with the instructions for other alloys. In the present study an analysis tool finite element analysis (FEA) will be used. The work presented in this project is aimed at the study of effect of vibration characteristics of aluminum alloys of different compositions. The modeling and analysis will be carried out using ANSYS software. A modal analysis will be carried out to understand the vibration behavior i.e., natural frequency and mode shapes, of the material considered. The mode shapes and natural frequency play an important role in the design of dynamic machines. The harmonic analysis will be done to determine frequency characteristics.