|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Cu-Nb Metallic Glasses with High Hardness
||Mohammad Abboud, Amir Motallebzadeh, Özgür Duygulu, Robert Maaß, Sezer Ozerinc
|On-Site Speaker (Planned)
We report on the mechanical properties of the Cu-Nb system over a wide compositional range of 31 – 83 at.% Cu. Characterization of the magnetron-sputtered thin films revealed a fully amorphous structure for Cu concentrations in the range of ~31–65 at.%. Nanoindentation measurements showed that hardness is about 7 GPa for Cu-rich samples and reaches 9 GPa as Cu concentration is reduced. The high hardness is considerably beyond the prediction by a rule-of-mixture that applies well to similar Cu-refractory metal binary glasses. For Cu concentrations of 70 at.% and higher, the microstructure evolves into a dispersion of Cu crystallites in the amorphous matrix. This regime exhibits a virtually constant hardness of about 7 GPa up to 83 at.% Cu. The findings provide insight into the structure-property relationships in Cu-Nb and highlight the vast design space to develop binary metallic glasses composed of immiscible metals.
||Mechanical Properties, Characterization, Thin Films and Interfaces