Shear transformation zone dynamics model for metallic glasses incorporating free volume as a state variable

被引：140
作者：
Li, L. [1 ]
Homer, E. R. [2 ]
Schuh, C. A. [1 ]
机构：
[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
[2] Brigham Young Univ, Dept Mech Engn, Provo, UT 84602 USA
来源：
ACTA MATERIALIA | 2013年 / 61卷 / 09期
关键词：
Metallic glasses; Shear transformation zone; Free volume; STZ dynamics model; hear bands; CONTINUUM ELASTOPLASTIC BEHAVIOR; STOCHASTIC-MODEL; VISCOPLASTIC DEFORMATION; SUPERCOOLED LIQUID; MOLECULAR-DYNAMICS; FLOW; TRANSITION; RELAXATION; DEPENDENCE; VISCOSITY;
D O I：
10.1016/j.actamat.2013.02.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A mesoscale model, shear transformation zone dynamics (STZ dynamics), is employed to investigate the connections between the structure and deformation of metallic glasses. The present STZ dynamics model is adapted to incorporate a structure-related state variable, and evolves via two competing processes: STZ activation, which creates free volume, vs. diffusive rearrangement, which annihilates it. The dynamical competition between these two processes gives rise to an equilibrium excess free volume that can be connected to flow viscosity via the phenomenological Vogel-Fulcher-Tammann relation in relaxed structures near the glass transition temperature. On the other hand, the excess free volume allows glasses to deform at low temperatures via shear localization into shear bands, even in the presence of internal stress distributions that arise upon cooling after processing. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：3347 / 3359
页数：13
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