Effect of local structures and atomic packing on glass forming ability in CuxZr100−x metallic glasses

摘要

Molecular dynamics simulations are performed for CuZr metallic alloys to study the structural andndynamical features for glass forming ability u0001GFAu0002. Our analysis shows that in CuZr metallicnsystem, although u00030,0,12,0u0004 icosahedral clusters are important, some Zr-centered clusters such asnu00030,1,10,4u0004 and u00030,1,10,5u0004 play a key role in slowing down the dynamics. It is found that thesenZr-centered clusters are intrinsically slow and fundamentally determine the stability and slowndynamics. Due to the strong spatial correlation between u00030,0,12,0u0004 and Zr-centered clusters, theirnrelative population influences the dense packing and dynamics in metallic glasses, and further thenGFA. © 2010 American Institute of Physics. u0005doi:10.1063/1.3282800