About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
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Presentation Title |
Improving Local Fracture Properties of W-CuZn Nanocomposites by Microstructure Tailoring |
Author(s) |
Daniel Kiener, Klemens Schmuck, Markus Alfreider, Michael Burtscher, Michael Wurmshuber |
On-Site Speaker (Planned) |
Daniel Kiener |
Abstract Scope |
Tungsten offers outstanding material properties for high performance applications in harsh environments, but commonly lacks damage and fracture tolerance due to a high ductile to brittle transition temperature. By creating a composite involving copper as ductile phase, the damage and fracture tolerance are increased at the expense of material strength. Hence, additional strengthening of the ductile phase is desirable, i.e. by alloying copper with zinc. Such W-CuZn nanocomposites were produced by severe plastic deformation, and microstructural investigations by means of SEM, TEM and TKD provided insights regarding the microstructural evolution. In-situ SEM fracture experiments on FIB milled micro-cantilevers were conducted to analyze crack growth and determine the material's fracture toughness. We show that the saturation grain size depends on the ductile phase strength and HPT deformation temperature. Furthermore, fracture analysis reveals that the fracture process is dominated by intercrystalline failure and that primarily inhomogeneities determine the achievable fracture toughness. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Mechanical Properties, |