Analysis of atomic mobility in a Cu38Zr46Ag8Al8 bulk metallic glass

► Atomic mobility in Cu38Zr46Ag8Al8 bulk metallic glass have been investigated by DMA. ► Loss factor is directly connected to the energy lost during application of the stress. ► Structural relaxation and crystallization induces a decrease of the atomic mobility. ► The concentration of quasi-point defects links to atomic mobility in metallic glasses.