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Investigation of Strain Accommodation upon Phase Transformation of Small Inclusions in Aluminum

Published online by Cambridge University Press:  15 March 2011

L. H. Zhang ,
E. Johnson  and
U. Dahmen
L. H. Zhang
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA94720, USA
E. Johnson
Affiliation:
Nano Science Center, Niels Bohr Institute, University of Copenhagen, and Department of Materials Research, RISØ National Laboratory, Denmark
U. Dahmen
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA94720, USA
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Abstract

The evolution of elastic strain caused by melting and solidification of small inclusions in aluminum was investigated by in-situ transmission electron microscopy. The appearance and subsequent decay of elastic strain during phase transformation of inclusions around 100nm in size were observed directly, and the decay rate was determined as a function of temperature. The mechanism of strain accommodation was studied by determining the activation energy of the process using alloy composition and inclusion size to control the transformation temperature.

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