Abstract
The medium-range order (MRO) of both as-cast and deformed states of a Zr-based bulk metallic glass (Zr52.5Cu17.9Ni14.6Al10Ti5 (at.-%) - Vitreloy 105) were analyzed using variable resolution fluctuation electron microscopy (VR-FEM). After deformation significant structural changes in the MRO were observed inside the shear bands and the adjacent matrix; the MRO was altered in terms of types, size and volume fractions. The changes in the matrix MRO confirm the existence of a shear affected zone around the shear band in our deformed sample. Since the MRO correlation length was larger inside the shear bands compared to the surrounding matrix, it is concluded that either frictional heat dissipation or shear induced nucleation and growth also plays a role in the alteration of MRO. The current work illustrates the significance of MRO in deformation of metallic glasses and suggests that the plasticity of monolithic BMGs can be improved by tailoring topological order based on MRO types, sizes and volume fractions.
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