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| VISCOSITY OF METALLIC GLASSES PdCu_6Si_(16.5), PdNi_6Si_(16.5) AND CuZr_(43) AND THEIR ACTIVATION ENERGIES OF VISCOUS FLOW |
| Gao Yiqun; Zheng Fuqian; Liu Xiong; Liao Zongyao (Institute of Precious Metals; Kunming) |
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Cite this article:
Gao Yiqun; Zheng Fuqian; Liu Xiong; Liao Zongyao (Institute of Precious Metals; Kunming). VISCOSITY OF METALLIC GLASSES PdCu_6Si_(16.5), PdNi_6Si_(16.5) AND CuZr_(43) AND THEIR ACTIVATION ENERGIES OF VISCOUS FLOW. Acta Metall Sin, 1982, 18(6): 696-702.
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Abstract The temperature dependence upon the viscosity of three metallic glasses PdCu_6Si_(16.5), PdNi_6Si_(16.5) and CuZr_(43) has been determined by the creep method near the vitrification temperature tange. Under the Newtonian viscous region, this dependence may be described by the Fulcher-Vogel equation. The constants of this equation were determined experimentally and the apparent activation energy of viscous flow for these three glasses was calculated therefrom. The activation energies of thermal transformation of the glasses PdNi_6Si_(16.5) and CuZr_(43) were also determined by differential scanning calorimetry. It was found that there is no appreciable difference in activation energy between viscous flow and thermal transformation for PdNi_6Si_(16.5), but marked for CuZr_(16.5).
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Received: 18 June 1982
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