| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XVIII
|
| Presentation Title |
Microstructure - Fracture Toughness Relationships in Bulk Metallic Glasses |
| Author(s) |
Jamie J. Kruzic, Bosong Li, Bernd Gludovatz, Anna V. Ceguerra, Keita Nomoto, Simon P. Ringer, Shenghui Xie, Sergio Scudino |
| On-Site Speaker (Planned) |
Jamie J. Kruzic |
| Abstract Scope |
Cold rolling and cryogenic thermal cycling were used to create heterogeneous glassy microstructures in Zr-based bulk metallic glasses (BMGs). Thermal cycling raised the fracture toughness of a Zr-Cu-Ni-Al-Nb BMG by promoting plastic deformation and stable crack growth. Microhardness mapping revealed a microstructure of hard and soft domains (~63 μm × 105 μm), and thermal cycling heterogeneously softened the hard domains while the soft domains remained unchanged. Multi-directional cold rolling samples prior to thermal cycling reduced the scatter in fracture toughness. One-directional (1-D) cold rolling of a Zr-Ti-Cu-Ni-Al BMG induced both hardening and softening in the microstructure with a heterogeneous distribution that depended on the rolling orientation. Accordingly, considerable anisotropy was found for the fracture toughness of the 1-D rolled samples. Transmission electron microscopy, synchrotron x-ray, and atom probe microscopy studies are underway to understand the nanostructural nature of the observed hard and soft microstructure heterogeneities. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, |