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

AUTOR(ES)

Bernardi, Heide Heloise, Sandim, Hugo Ricardo Zschommler, Zilnyk, Kahl Dick, Verlinden, Bert, Raabe, Dierk

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

13/07/2017

RESUMO

A [211]-oriented niobium single crystal was deformed by equal channel angular pressing (ECAP) at room temperature using the route Bc to a total strain of 9.2. A sharp cube texture develops after ECAP processing. The deformed samples were annealed in vacuum from 400ºC (673 K) to 900ºC (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 550ºC (823 K) due to discontinuous recrystallization. Normal grain growth replaces discontinuous recrystallization as the main coarsening mechanism above 700ºC (973 K).

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