Quenched-in Free Volume V{sub}f, Deformation-induced Free Volume, the Glass Transition T{sub}g and Thermal Expansion in glassy ZrNbCuNiAl measured by Time-resolved Diffraction in Transmission

摘要

Using high-precision X-ray dilatometry, we have succeeded in directly measuring excess quenched-in free-volume V{sub}f in metallic glasses. The method was applied to the very easy glass forming Zr{sub}57Nb{sub}5Cu{sub}15.4Ni{sub}12.6Al{sub}10 (Vit 106). The annealing out of the order of 0.5% free volume was observed during heat treatment of rapidly solidified glassy ribbons. Excess free volume was also generated by heavy deformation and observed to anneal out during heat treatment. Once the excess free volume anneals out, the glass transition T{sub}g appears clearly as a break in the x-ray dilatation curves as the glass goes over to the supercooled liquid region prior to crystallization at T{sub}x.