Affiliation:
1. Materials Characterization and Performance Department, Sandia National Laboratories , 1515 Eubank Blvd. SE - Mail Stop 1411 - Albuquerque, NM 87123 , USA
Abstract
Abstract
Heat-treated FeCo-based magnetic alloys were characterized using a suite of electron microscopy techniques to gain insight into their structural properties. Electron channeling contrast imaging (ECCI) in the scanning electron microscope (SEM) found unique grains towards the outer edge of a FeCo sample with nonuniform background contrast. High-magnification ECCI imaging of these nonuniform grains revealed a weblike network of defects that were not observed in standard uniform background contrast grains. High-resolution electron backscattered diffraction (HR-EBSD) confirmed these defect structures to be dislocation networks and additionally found subgrain boundaries within the nonuniform contrast grains. The defect content within these grains suggests that they are unrecrystallized grains, and ECCI can be used as a rapid method to quantify unrecrystallized grains. To demonstrate the insight that can be garnered via ECCI on these unique grains, the sample was imaged before and after micro indentation. This experiment showed that slip bands propagate throughout the material until interacting with the dislocation networks, suggesting that these specific defects provide a barrier to plastic deformation. Taken together, these results show how ECCI can be used to better understand failure mechanisms in alloys and provides further evidence that dislocation networks play a critical role in the brittle failure of FeCo alloys.
Funder
Laboratory Directed Research and Development program
Sandia National Laboratories
National Technology and Engineering Solutions of Sandia LLC
Honeywell International Inc.
U.S. Department of Energy’s National Nuclear Security Administration
Publisher
Oxford University Press (OUP)
Cited by
1 articles.
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