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Investigation of Surface Grooves from Migrating Grain Boundaries

Published online by Cambridge University Press:  11 February 2011

Nicole E. Munoz ,
Shelley R. Gilliss ,
N. Ravishankar  and
C. Barry Carter
Nicole E. Munoz
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455–01432
Shelley R. Gilliss
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455–01432
N. Ravishankar
Affiliation:
Now at Materials Research Center, Indian Institute of Science, Bangalore 560 012, India
C. Barry Carter
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455–01432
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Abstract

Visible-light microscopy (VLM) and atomic-force microscopy (AFM) were used to study the progression of grain-boundary grooving and migration in high-purity alumina (Lucalox™). Groove profiles from the same grain boundaries were revisited using AFM following successive heat-treatments. The grooves measured from migrating grain boundaries were found to have asymmetric partial-angles compared to those measured from boundaries that did not migrate during the experiment. For a moving boundary, the grain with the larger partial-angle was consistently found to grow into the grain with the smaller partial-angle. Migrating boundaries were observed to leave behind remnant thermal grooves. The observations indicate that the boundary may be bowing out during the migration process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 750: Symposium Y – Surface Engineering 2002–Synthesis, Characterization and Applications , 2002 , Y8.39
Copyright
Copyright © Materials Research Society 2003

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References

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