About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XVII
|
Presentation Title |
Relaxation Phenomena in Severely Deformed Bulk Metallic Glasses |
Author(s) |
Jurgen H. Eckert |
On-Site Speaker (Planned) |
Jurgen H. Eckert |
Abstract Scope |
The atomistic mechanisms underlying aging and rejuvenation of bulk metallic glasses (BMGs) are still unclear. Recent results indicate that structural relaxations on the nanometer scale and their percolation may be involved in the formation of shear transformation zones (STZs) and shear bands controlling the ductility. Hence, there is fundamental interest to understand the interplay of structural and dynamic relaxations for equilibrated as well as non-equilibrated BMGs for improving their ductility. For this, in-situ X-ray diffraction was used to study the structural rearrangements during annealing of CuZr-based BMGs driven out of equilibrium by severe plastic deformation. The structural changes are correlated with dynamic mechanical analysis (DMA), dilatometry and differential scanning calorimetry to determine dynamic relaxations and crystallization. We find that structural rearrangements occur at the same temperatures as the dynamic gamma, beta and beta’ relaxations determined by DMA, and will discuss the impact of these findings for plasticity improvement. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |