Volume and enthalpy relaxation in Zr55Cu30Ni5Al10 bulk metallic glass
Volume and enthalpy relaxation in Zr55Cu30Ni5Al10 bulk metallic glass
复制标题
DOI：
10.1016/j.actamat.2009.11.025
复制
发表时间：
2010-03-01
期刊：
影响因子：
9.4
通讯作者：
Yokoyama, Y.
中科院分区：
文献类型：
--
作者：
Haruyama, O.;Nakayama, Y.;Yokoyama, Y.
通过不同温度下的体积弛豫和焓弛豫研究了 Zr55Cu30Ni5Al10 块体金属玻璃的结构弛豫。拉伸指数松弛函数 Phi(t) = exp[-(t/tau)(beta)] 很好地描述了松弛动力学。 Kohlrausch 指数 beta 的范围为 0.35 至 0.69，而弛豫时间 tau 的温度依赖性最好通过 Vogel-Fulcher-Tanmmann 公式拟合，tau(T) = tau(0) exp [D* T-0/(T - T-0)]，其中 tau(0) = 1.1 x 10(-14) s，D* = 44.2 和T-0 = 311 K。通过静电悬浮法测量平衡液体区域中的原子体积，并且这些体积以及松弛玻璃的体积通过 Cohen-Grest 模型比通过 Cohen-Turnbull 模型更好地描述。 (C) 2009 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
The structural relaxation in a Zr55Cu30Ni5Al10 bulk metallic glass was investigated by volume and enthalpy relaxation at various temperatures. The relaxation kinetics was well described by a stretched exponential relaxation function, Phi(t) = exp[-(t/tau)(beta)]. The Kohlrausch index, beta, ranged from 0.35 to 0.69, while the temperature dependence of relaxation time, tau was best fitted by the Vogel-Fulcher-Tanmmann formula, tau(T) = tau(0) exp [D* T-0/(T - T-0)], with tau(0) = 1.1 x 10(-14) s, D* = 44.2 and T-0 = 311 K. Atomic volumes in the equilibrium liquid region were measured by the electrostatic levitation method and these volumes, together with volumes of relaxed glasses, were better described by the Cohen-Grest model than by the Cohen-Turnbull model. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.