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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Flow behavior and associated microstructures of niobium at 1200 to 1500°C
Author(s) Emily Brady, Eric Taleff
On-Site Speaker (Planned) Emily Brady
Abstract Scope The tensile flow behavior of a Type 2 niobium sheet material, per ASTM B393-18, was evaluated at temperatures from 1200 to 1500°C and true-strain rates of 10-3 and 10-4 s-1 in a vacuum environment. Microstructures before and after tensile testing were characterized using scanning electron microscopy and electron backscatter diffraction. Microstructural features characterized include grain size, microtexture, and structures produced during deformation at elevated temperature. The flow behaviors and microstructures of this material are compared to those of a Type 1 niobium material; the Type 1 material has a lower impurity content than the Type 2 material. The Type 2 material is more resistant to grain growth and presents higher flow stresses than the Type 1 material. Differences in microstructure between the Type 1 and Type 2 materials are used to rationalize the differences in flow behaviors observed at elevated temperatures.
Proceedings Inclusion? Planned:
Keywords Mechanical Properties, Characterization, High-Temperature Materials


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