Study of Serrated Flows in Bulk Metallic Glasses (BMGs)
Peter Liaw (), Xie Xie (University of Tennessee), James Antonaglia (University of Illinois at Urbana Champaign), Junpeng Liu (), Junwei Qiao (), Yong Zhang (), Gongyao Wang (University of Tennessee), Karin Dahmen (University of Illinois)
Slip Avalanches in Amorphous Metals
Mon 9:00 - 10:30
Barus-Holley 168
Similar to the Portevin–Le Chatelier effect (PLC) or jerky flow in crystalline materials, serration behavior is observed during the plastic deformation of bulk metallic glasses (BMGs). Recent work shows that it's organized in hidden order and closely related to the structural evolution and shear-band operations. In the present research, we studied the serrated flows of BMGs under compression experiments. The statistical characteristics of serration behavior, e.g., the distribution of stress drop and serration duration, were extracted from the stress-strain curves and compared at different strain-rate levels. The experimental data will be compared to predictions of a recent slip-avalanche model. Acknowledgements: PKL very much appreciates the financial support from the US National Science Foundation (DMR-0909037, CMMI-0900271, and CMMI-1100080), the Department of Energy (DOE), Office of Nuclear Energy’s Nuclear Energy University Program (NEUP) 00119262, and the DOE, Office of Fossil Energy, National Energy Technology Laboratory (DE-FE-0008855) with C. Huber, C. V. Cooper, D. Finotello, A. Ardell, E. Taleff, V. Cedro, R. O. Jensen, L. Tan, and S. Lesica as contract monitors. KAD gratefully acknowledges the NSF grants of DMR-1005209 and DMS-1069224. YZ very appreciates the financial support from the National Natural Science Foundation of China (Nos. 51010001 and 51001009), 111 Project (B07003), and the Program for Changjiang Scholars and the Innovative Research Team of the University.