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Kinetic Limitations to Shape Equilibration of Liquid Pb Inclusions In Al

Published online by Cambridge University Press:  15 February 2011

H. Gabrisch ,
L. Kjeldgaard ,
A. Værnholt Olesen ,
E. Johnson  and
U. Dahmen
H. Gabrisch
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory Niels Bohr Institute, Ørsted Laboratory, University of Copenhagen, Denmark
L. Kjeldgaard
Affiliation:
Cyclotron Road, Berkeley, California 94720, USA
A. Værnholt Olesen
Affiliation:
Cyclotron Road, Berkeley, California 94720, USA
E. Johnson
Affiliation:
Cyclotron Road, Berkeley, California 94720, USA
U. Dahmen
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory Niels Bohr Institute, Ørsted Laboratory, University of Copenhagen, Denmark
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Abstract

The shape of liquid Pb inclusions in Al was investigated by in-situ electron microscopy over a temperature interval from 300 to 500°C. The inclusion shape was found to depend on size and temperature. During isothermal annealing after melting, small inclusions rounded off while larger inclusions remained faceted until the temperature was raised to about 500°C. During subsequent cooling, inclusions refaceted, although less strongly than during heating. The shape hysteresis between heating and cooling cycles was found to be due to the barrier of ledge nucleation necessary to advance the faceted interfaces. The observations show that the step energy depends on temperature and its disappearance at about 540-600°C indicates a roughening transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 580: Symposium E – Nucleation & Growth Processes in Materials , 1999 , 257
Copyright
Copyright © Materials Research Society 2000

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