Engineering nanoscale heterogenities in thin film metallic glasses via alloying with immiscible elements
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Nanoengineering strategies for controlling local heterogeneities in thin film metallic glasses (TFMGs) offer a promising pathway to tailor their mechanical properties, thereby expanding their potential applications. While previous strategies have mainly focused on modifying the amorphous structure without altering the phase composition, an emerging approach involves the development of composite structures. This can be achieved by alloying with elements that exhibit a positive mixing enthalpy with the primary constituents, introducing controlled heterogeneities such as clustering, partial crystallization, or multiphase formation. Heterogeneities may help mitigate the inherent brittleness of TFMGs by preventing or deflecting shear bands propagation. Such structural modifications promote more homogeneous plastic deformation, enhancing fracture toughness, while the presence of clusters or crystalline phases may induce strain hardening. In this study, (Zr34Cu66)1-xFex TFMGs were synthesized via magnetron sputtering, with Fe content varying from 0 to 76 at.%, allowing precise control over composition and nanoscale heterogeneities and their effects on atomic structure and mechanical properties. By correlating experimental results with ab initio molecular dynamics simulations, a structure-property relationship was established, providing insight into how Fe-induced nanoscale heterogeneities influence shear band propagation and deformation mechanisms. This approach bridges the gap between microstructural engineering and mechanical optimization.
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