Free-volume Model Based Finite Element Analysis for Deformation Behavior of Bulk Metallic Glasses
Deformation behavior and formability are important properties for reliable applications of advanced materials. High temperature deformation behavior of bulk metallic glass (BMG) alloys in supercooled liquid region (SLR) is homogeneous Newtonian under slow strain rate conditions, while room temperature deformation behavior of BMGs has been known as inhomogeneous because the material is locally deformed within thin shear bands. In this paper, the free volume model based constitutive equation of the BMG alloy has been combined with the finite element method (FEM) and applied to the temperature and strain rate dependent deformation behavior at temperatures within SLR. Validity of the current approach was assessed through the reproduction of compression data for the Vitreloy 1 BMG alloy by FEM. The FEM simulations combined with the free volume constitutive model well reproduced the deformation behavior, such as Newtonian viscous flow without stress overshoot and non-Newtonian viscous flow with stress overshoot in SLR under slow and fast strain rate conditions, respectively. In particular, formability of the Vitreloy 1 in SLR was successfully estimated using FEM.
Bulk Metallic Glass Finite Element Method Constitutive Model Mechanical Properties Supercooled Liquid Region
H.S.Kim H-J.Jun Y.W.Chang
Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, South Korea
国际会议
2nd Asian Workshop on Macro/Nano Forming Technology(AWMFT-2009)(第2届亚洲微米纳米技术研讨会)
长沙
英文
590-593
2009-10-25（万方平台首次上网日期，不代表论文的发表时间）