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7-Parameter Automated Measurement of the Shapes of Nanoscale Inclusion by TEM

Published online by Cambridge University Press:  02 July 2020

H. Gabrisch ,
G. Cong ,
B. Parvin ,
L. Kjeldgaard ,
E. Johnson  and
U. Dahmen
H. Gabrisch
Affiliation:
Lawrence Berkeley National Laboratory, University of California, Berkeley, CA, USA 'National Center for Electron Microscopy, University of Copenhagen, Denmark
G. Cong
Affiliation:
Lawrence Berkeley National Laboratory, University of California, Berkeley, CA, USA Information and Computing Sciences Division, University of Copenhagen, Denmark
B. Parvin
Affiliation:
Lawrence Berkeley National Laboratory, University of California, Berkeley, CA, USA Information and Computing Sciences Division, University of Copenhagen, Denmark
L. Kjeldgaard
Affiliation:
Lawrence Berkeley National Laboratory, University of California, Berkeley, CA, USA Niels Bohr Institute, Orsted Laboratory, University of Copenhagen, Denmark
E. Johnson
Affiliation:
Lawrence Berkeley National Laboratory, University of California, Berkeley, CA, USA Niels Bohr Institute, Orsted Laboratory, University of Copenhagen, Denmark
U. Dahmen
Affiliation:
Lawrence Berkeley National Laboratory, University of California, Berkeley, CA, USA 'National Center for Electron Microscopy, University of Copenhagen, Denmark
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Extract

The equilibrium shape of liquid inclusions in a crystalline matrix is a direct measure of the orientation dependence, or anisotropy, of the liquid/solid interfacial energy. In this work we have used diffraction contrast imaging in TEM to observe the shape of nanoscale liquid Pb inclusions in a solid Al matrix as a function of temperature. While a previous investigation reported a highly anisotropy equilibrium shape [1], more recent work showed that the inclusion shape depends on size, temperature and thermal history [2-4]. Here we report on a new method to make accurate automated measurements of these particle shapes during in-situ heating above the melting point of the inclusions.

Fig.l shows a typical bright field image of an array of liquid Pb inclusions in a solid Al matrix recorded at temperature during in-situ heating to 423°C. Under these two-beam diffraction conditions, particles are visible by absorption contrast and appear dark on a light background.

Type
Surfaces and Interfaces
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 1062 - 1063
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Moore, K.L., Chattopadhyay, K. and Cantor, B., Proc. Roy. Soc. Lond. A414, 499 (1987).Google Scholar
2.Olesen, A. Vaernholt, MS thesis, University of Copenhagen, (1998).Google Scholar
3.Kjeldgaard, L., Ph.D. thesis, University of Copenhagen, (1999)Google Scholar
4.Gabrisch, H. etal., Proc MRS, in pressGoogle Scholar