Deformation behavior and formability of a Ti-Zr-Ni-Be bulk metallic glass within supercooled liquid region

Abstract

Deformation behavior of a Ti-based bulk metallic glass (BMG) has been investigated by performing a series of uniaxial compression tests at various temperatures within the supercooled liquid region (SLR). Non-Newtonian viscous flow characteristics of BMG alloys was found to change into a homogeneous Newtonian viscous flow under a proper combination of strain rate and test temperature by compression tests. These Newtonian and non-Newtonian viscous flows were analyzed by applying the Newtonian viscous flow theory and the transition state theory, respectively. A processing map could be also constructed based on a dynamic materials model to estimate the formability and the results were then compared with those of laboratory-scale extrusion tests performed under various punch jig speeds. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.