Study of Damping Behavior of Metallic Glass Composites at Nanoscale Using Molecular Dynamics

The dynamic behaviour of Cu₆₄Zr₃₆ metallic glass (MG) was examined using the molecular dynamics approach. Two reinforcements were used with MG, namely single-walled carbon nanotube (SWCNT) and graphene. The effect of increasing the temperature on the dynamic properties of Cu₆₄Zr₃₆ –CNT and Cu₆₄Zr₃₆ –graphene was investigated using the Biovia Materials Studio 7.0. It was concluded that the CNTs could significantly enhance the storage modulus of amorphous MG, but graphene was found to be a better reinforcement. The peak of normalized storage modulus at the onset of glass transition of Cu₆₄Zr₃₆ MG moved to higher temperature as the driving frequency was increased. An abnormal internal friction behaviour occurred in the temperature range of 450–550 K. In comparison to the bulk MG, the normalized storage modulus for Cu₆₄Zr₃₆ –CNT composite was higher (maximum by 12.5%). Also, the normalized damping loss modulus for Cu₆₄Zr₃₆ –CNT composite was found to be lower (maximum difference of 6.67%) in comparison to bulk MG. In comparison to the bulk MG, the normalized storage modulus for Cu₆₄Zr₃₆ –graphene composite was higher (maximum by 25%). In comparison to the Cu₆₄Zr₃₆ –CNT composite, the normalized storage modulus of Cu₆₄Zr₃₆ –graphene composite was found to be higher by approximately 11% at a temperature of 700 K. The results of the study will help the researchers in the design and development of such MG based nanocomposites that have high energy absorption capability.