An NMR study of homogenous deformation-induced ordering in La$_{50}$Ni$_{15}$Al$_{35 }$

The mechanism of mechanical deformation is currently an unresolved issue of fundamental importance. $^{27}$Al NMR nutation experiments in La$_{50}$Ni$_{15}$ Al$_{35}$ bulk metallic glasses (BMG) were carried out to probe local structural changes induced by elastostatic compression at room temperature. It was observed that compression enhances local symmetry at Al sites with compression time. Modulated differential calorimetry studies were also performed to understand how free volume changes with compression time. Results provide insight into the nature of homogenous deformation and the interplay of free volume with local structural changes.