Constitutive model for high temperature deformation behavior of Ti-Zr-Ni-Be bulk metallic glass in supercooled liquid region

被引：8
作者：
Jun, H. -J. [2 ]
Lee, K. S. [3 ]
Kato, H. [4 ]
Kim, H. S. [1 ]
Chang, Y. W. [1 ]
机构：
[1] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 790784, South Korea
[2] Korea Atom Energy Res Inst KAERI, Taejon, South Korea
[3] KIMS, Mat Proc Div, Mat Deformat Grp, Chang Won 641831, South Korea
[4] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
来源：
COMPUTATIONAL MATERIALS SCIENCE | 2012年 / 61卷
基金：
新加坡国家研究基金会;
关键词：
Bulk metallic glass; Supercooled liquid region; High temperature deformation; Constitutive model; Finite element method; FORMABILITY; FLOW; STATE; CRYSTALLIZATION; RELAXATION; EXTRUSION;
D O I：
10.1016/j.commatsci.2012.04.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A constitutive equation based on a free volume model, that describes the strain rate dependent deformation behavior of bulk metallic glasses (BMGs) within the supercooled liquid region, has been modified in this paper in order to reproduce the stress increment that occurs due to crystalline phase formation during lengthy exposure to high temperature in compression deformation. A comparison of the simulated results obtained from finite element analyzes with the compression test results for Ti-Zr-Ni-Be BMG alloy has been conducted to determine the validity of the proposed model. Plastic deformation modes such as Newtonian and non-Newtonian viscous flows of this BMG alloy were found to be reproduced well by the finite element method simulations combined with the free volume based constitutive relations and to show a phenomenon of stress increment deviated from the steady state. Therefore, the constitutive relations introduced here are expected to allow accurate reproduction of the high temperature behavior and better estimation of the formability of BMG alloys. (c) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：213 / 223
页数：11
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