Newtonian and non-Newtonian viscosity of supercooled liquid in metallic glasses
Newtonian and non-Newtonian viscosity of supercooled liquid in metallic glasses
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DOI：
10.1016/s0921-5093(00)01562-8
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发表时间：
2001-05-31
期刊：
影响因子：
6.4
通讯作者：
Inoue, A
中科院分区：
文献类型：
--
作者：
Kawamura, Y;Nakamura, T;Inoue, A
用恒应变速率拉伸实验研究了La_（55）Al_（25）Ni_（20），Zr_（65）Al_（10）Ni_（10）Cu_（15）和Pd_（40）Cu_（40）P_（20）在较宽应变速率范围内的粘度。金属玻璃过冷液体表现出牛顿粘度（平衡态），随着温度的升高，其转变为非牛顿粘度（非平衡态）。牛顿粘度的临界应变速率随温度的升高而增加，符合Arrhenius关系。应变速率对粘度的依赖性用拉伸指数函数eta/eta（0）= 1 - esp（C/η（β））表示的主曲线很好地描述。用Cohen和Grest的fret体积模型成功地描述了牛顿粘度。牛顿粘度的脆弱性表明，金属玻璃的过冷液体可分为Ge_（10）As_（10）Se_（80）、B_2 O_3和Na_2 O-2SiO（2）等较强的玻璃形成体。(C)2001 Elsevier Science B. V.保留所有权利。
We have investigated the viscosity of the supercooled liquids over a wide range of strain rate by constant-strain-rate: tensile tests for La55Al25Ni20, Zr65Al10Ni10Cu15 and Pd40Cu40P20 (at.%) metallic glasses. The supercooled liquids exhibited Newtonian viscosity (equilibrium state) that transferred to a non-Newtonian viscosity (non-equilibrium state) with increasing temperature. The critical strain rate of the Newtonian viscosity increased with increasing temperature in accordance with the Arrhenius relation. The strain rate dependence of viscosity was described well with a master curve expressed by a stretched exponential function eta/eta (0) = 1 - esp(C/epsilon (beta)). The Newtonian viscosity was successfully described with the fret-volume model of Cohen and Grest. The fragility of the Newtonian viscosity revealed that the supercooled liquids of the metallic glasses were classified into the relatively strong liquids such as Ge10As10Se80, B2O3 and Na2O-2SiO(2) glass formers. (C) 2001 Elsevier Science B.V. All rights reserved.