Viscosity and crystallization of equiatomic Pd20Pt20Cu20Ni20P20 metallic glass

Equiatomic metallic glasses are expected to show different properties compared to one principal element-based metallic glasses due to different configurational entropy and atomic-level order. Here, we compare the rheological and transport properties of the supercooled liquid states of compositionally related equiatomic Pd20Pt20Cu20Ni20P20 and Pt-rich Pt57.3Cu14.6Ni5.3P22.8 metallic glasses. The temperature dependent viscosity values were calculated from thermoplastic molding experiments. The kinetic fragility and isothermal crystallization times were compared to evaluate the correlation between the viscous flow and the diffusivity. The equiatomic metallic glass exhibits stronger liquid behavior, but faster crystallization kinetics than Pt-based metallic glass. The thermoplastic formability of two metallic glasses at different length scales was evaluated using molding and drawing experiments.