About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Bulk Metallic Glasses XVII
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Presentation Title |
Role of Heterogeneous Microstructure Modifications in Affecting Fracture Toughness of Zr-based 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 manipulate heterogeneous glassy microstructures and fracture toughness in Zr-based BMGs. Thermal cycling raised the fracture toughness of a Zr-Cu-Ni-Al-Nb BMG by promoting plastic deformation and stable crack growth, with the most significant increase occurring in the first 20 thermal cycles. 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 apparently unchanged. Two-dimensional cold rolling the samples prior to thermal cycling reduced the scatter in fracture toughness compared to as-cast thermal cycled samples. One-dimensional cold rolling of a Zr-Ti-Cu-Ni-Al BMG was found to induce both heterogeneous hardening and softening in the microstructure, and create considerable anisotropy to the fracture toughness. Transmission electron and atom probe microscopy studies are underway to understand the nanostructural nature of the observed heterogeneities. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |