Alloying effect on the viscous flow in metallic glasses |
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Authors: | HS Chen |
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Institution: | Bell Laboratories, Murray Hill, New Jersey 07974, USA |
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Abstract: | The temperature dependence of viscosities near the glass transition is measured from the rates of thermal transformation for metallic glasses PtNiP, PdNiP, NiPBA1 and (Fe, Co)PBA1. Alloying among metallic elements which lowers the glass transition temperature Tg lowers the ideal glass transition temperature T0, but raises the residual configurational entropy Sg and the activation energies for “diffusive” rearrangement, , of the alloying glasses, while compositional ordering associated with the addition of metalloids raises the Tg and T0 and lowers the Sg and . Results are correlated to the atomic ordering and stability of the glasses. The extracted free volume and the critical diffusive volume are much smaller, by a factor of 4, for metallic glasses than for many other glasses. |
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