Fragility of superheated melts in Al–RE (Ce, Nd, Pr) alloy system

The fragility of superheated melt M, characterized by the temperature dependence of the viscosity scaled by the viscosity at the liquidus temperature, has been proposed by Bian et al. recently. In this work, the values of M of Al–RE(Ce, Nd, Pr) melts were calculated based on the viscosities measured in the range of less than 250 K above their liquidus temperatures. It was found that M has a good negative correlation with the glass-forming ability (GFA) in Al–RE binary alloy system. Although the previous study found that M could reflect the GFA in Al–Co–Ce alloy system, there is no good relationship between M and GFA in the alloy system including Al–RE and Al–Co–Ce alloys simultaneously. The relationship between fragility of superheated melts and glass-forming behavior in different Al-based alloy systems was elaborated.