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Journal Article

Microstructural Stability of a Niobium Single Crystal Deformed by Equal Channel Angular Pressing

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Raabe,  Dierk
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Bernardi, H. H., Sandim, H. R. Z., Zilnyk, K. D., Verlinden, B. E., & Raabe, D. (2017). Microstructural Stability of a Niobium Single Crystal Deformed by Equal Channel Angular Pressing. Materials Research-Ibero-American Journal of Materials, 20(5), 1238-1247. doi:10.1590/1980-5373-MR-2017-0288.


Cite as: https://hdl.handle.net/21.11116/0000-0001-6471-F
Abstract
A [211]-oriented niobium single crystal was deformed by equal channel angular pressing (ECAP) at room temperature using the route B-c to a total strain of 9.2. A sharp cube texture develops after ECAP processing. The deformed samples were annealed in vacuum from 400 degrees C (673 K) to 900 degrees C (1173 K) for 1 h to evaluate their microstructural stability. Scanning electron microscopy (SEM) was used to image the microstructures of as-deformed and annealed specimens. Electron backscatter diffraction (EBSD) was employed to determine the respective microtextures before and after annealing. Coarsening of the microstructure occurs at a maximum rate at 550 degrees C (823 K) due to discontinuous recrystallization. Normal grain growth replaces discontinuous recrystallization as the main coarsening mechanism above 700 degrees C (973 K).