VISCOUS FLOW BEHAVIOUR OF Pd-Si BASE METALLIC GLASSES UNDER HEAT
ZHENG Fuqian; LIAO Zongyao; HU Jiansong (Institute of Precious Metals; China National Non-Ferrous Metal Industry Corp.; Kunming)
Cite this article:
ZHENG Fuqian; LIAO Zongyao; HU Jiansong (Institute of Precious Metals; China National Non-Ferrous Metal Industry Corp.; Kunming). VISCOUS FLOW BEHAVIOUR OF Pd-Si BASE METALLIC GLASSES UNDER HEAT. Acta Metall Sin, 1986, 22(1): 107-114.
Abstract The homogeneous viscous flow behaviour of six Pd-Si base metallic glasses under heat at same rate has been invetigated by tensile method. The dynamic viscosity and the activation energy of dynamic viscous flow in their rapid flow region have been evaluated. The results showed that the maximum flow rate and the lower viscosity at 30-35℃ above T_g are presented in the Pd-Si base metallic glasses with an addition of third metal Cu, Ag or Ni. The dynamic viscosity of eutectic Pd_(82)Si_(18) at a close level of temperature,10—20℃ above T_g, is obviously lower that of another two binary metallic glasses. On the basis of the free volume model and the entropy model for the viscous flow, the proposal would be made of that the viscous flow behaviour of the metallic glasses is related to their thermal stability and degree of short-range order.
