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In Situ Observations of the Interaction of Liquid Lead Inclusions with Grain Boundaries in Aluminum

Published online by Cambridge University Press:  28 July 2005

Heike Gabrisch ,
Ulrich Dahmen  and
Erik Johnson
Heike Gabrisch
Affiliation:
Materials Science Division, National Center for Electron Microscopy, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720
Ulrich Dahmen
Affiliation:
Materials Science Division, National Center for Electron Microscopy, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720
Erik Johnson
Affiliation:
Øersted Laboratory, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK 2100 Copenhagen Ø, Denmark
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Abstract

The evolution of liquid lead (Pb) inclusions at grain boundaries in aluminum (Al) was investigated by direct in situ TEM observation in the temperature range from 330°–643°C, In agreement with earlier reports on quenched alloys, the characteristic contact angle of the lens-shaped grain boundary inclusions was found to be near 120°. This angle remained approximately constant over the entire temperature range, ruling out the possibility of a wetting transition. Coarsening of grain boundary inclusions was observed to proceed mainly by Ostwald ripening, although coalescence could also be observed. Inclusions at grain boundaries, at triple junctions, and at the intersection of grain boundaries with the foil surfaces adopted characteristic shapes that were shown to be equilibrium forms. At the highest temperatures, the grain boundaries were observed to detach from the inclusions and the interaction of a migrating grain boundary with inclusions could be observed.

Keywords

liquid inclusionsgrain boundariesAl-Pbin situ heatingwettingtriple junctionscoarsening
Type
1998 ASU ELECTRON MICROSCOPY WORKSHOP
Information
Microscopy and Microanalysis , Volume 4 , Issue 3 , June 1998 , pp. 286 - 293
Copyright
© 2005 Microscopy Society of America

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