About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XX
|
Presentation Title |
Steady-state Serrated Flow Induced by Rejuvenation Gradient in Zr-based Bulk Metallic Glass |
Author(s) |
Wook Ha Ryu, Won-Seok Ko, Rui Yamada, Geun Hee Yoo, Junji Saida, Eun Soo Park |
On-Site Speaker (Planned) |
Wook Ha Ryu |
Abstract Scope |
In this work, we propose novel methods to utilize the rejuvenation phenomenon to heterogeneously modulate local energy states and free volume (FV) content in bulk metallic glasses (BMGs). We induce rejuvenation gradient in BMG through deep cryogenic treatment using LN2. The gradient structure prevented strain softening and induced apparent hardening to maintain steady-state serrated flow during compressive plastic deformation. The major and minor shear bands intersect at the gradient interface, which prevents softening in the shear plane by interfering with the propagation of the major shear plane. The plastic strain increased significantly due to the stable steady-state serrated flow. Key factors in improving mechanical properties are the change in critical shear stress and shear band angle in the local area of BMG according to the FV gradient. The post-processing methods in this study are simple, non-destructive, and can dramatically improve the mechanical properties of BMGs. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Phase Transformations, Mechanical Properties |