|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||Intermediate Temperature Brittleness in Metallic Glasses
||Jianzhong Jiang, Chao Wang, Qingping Cao, Xiaodong Wang, Dongxian Zhang, Upadrasta Ramamurty, Ramasubramanian Lakshmi Narayan
|On-Site Speaker (Planned)
In an attempt to understand the variations in the extensibility or ductility of MGs, within the temperature range of 0.1-0.8 Tg, we systematically bent MG bars or plate specimens with three different compositions and noted the extent of permanent deformation at each temperature. Initially, as suggested by logic, all MGs display higher ductility with increasing temperature, but at a temperature of ~0.6 Tg their strain to failure drastically drops, before increasing again at higher temperatures. The changes in ductility with temperature are broadly controlled by the competition between the dynamics of SB formation and the kinetics of the strain alleviating atomic diffusion, where the latter process becomes more significant with rising temperatures. The observation of the intermediate temperature ductility minimum then sets a precedent in the classifying ductile and brittle behavior, in all MGs, with reference to their Tg.
||Planned: Supplemental Proceedings volume