About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Bulk Metallic Glasses XX
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Presentation Title |
Medium-range Order Controls Hardness and Fracture Toughness in Bulk Metallic Glasses |
Author(s) |
Jamie J. Kruzic, Keita Nomoto, Bosong Li, Christoph Gammer , Anna Ceguerra, Huma Bilal , Anton Hohenwarter, Jürgen Eckert, Bernd Gludovatz, Simon P. Ringer |
On-Site Speaker (Planned) |
Jamie J. Kruzic |
Abstract Scope |
Bulk metallic glasses (BMGs) can range from tough to brittle depending on their structural state; however, quantifying their structure-property relationships has been an unresolved challenge. We overcame this challenge by utilizing nanobeam electron diffraction and fluctuation electron microscopy to develop structure-property relationships for three different Zr-based BMG compositions, two different manufacturing routes (cast and laser powder bed fusion), and various thermo-mechanical histories (cryogenically-cycled, cold deformed, etc.). Our findings revealed that local hardness within the BMG microstructure is controlled by the size and volume fraction of FCC-like medium-range order (MRO) clusters. We have proposed a model of ductile phase softening whereby relatively soft FCC-like MRO clusters sit in a matrix of harder icosahedral dominated ordering. Furthermore, the relationships between hardness and MRO for the various BMGs are maintained after different relaxation and rejuvenation treatments where hardening and softening can be correlated with embrittlement or toughening of the macroscopic BMG properties, respectively. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Other, |