Droplets of Zr41Ti14Cu12.5Ni10Be22.5 glass-forming alloy with different sizes are solidified in a drop tube containerless process.The glass transition temperature Tg of Zr41Ti14Cu12.5Ni10Be22.5 glassy spheres solidified with different cooling rates is investigated by using a differential scanning calorimeter.It was found that all the amor phous spheres show an increase of Tg with the heating rate.The glassy spheres have a unique value for the glass transition activation energy Eg=435.50kJ/mol,which is independent of cooling rate q.The insensitivity of Tg to q is interpreted by an extension of the free volume model for flow.
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