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Size-Dependent Equilibrium Shapes of Solid Pb Inclusions in Al

Published online by Cambridge University Press:  02 July 2020

U. Dahmen ,
E. Johnson ,
S.Q. Xiao ,
S. Paciornik  and
A. Johansen
U. Dahmen
Affiliation:
Department of Physics, Niels Bohr Institute, Univ. of Copenhagen, Denmark
E. Johnson
Affiliation:
Department of Physics, Niels Bohr Institute, Univ. of Copenhagen, Denmark
S.Q. Xiao
Affiliation:
>Riga Analytical Lab, Inc., Santa Clara, CA95054, USA
S. Paciornik
Affiliation:
DCMM PUC Rio, Brazil
A. Johansen
Affiliation:
Department of Physics, Niels Bohr Institute, Univ. of Copenhagen, Denmark
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Extract

Small Pb inclusions in Al have been studied by a number of investigators because the alloy system offers the possibility of observing the processes of melting and solidification directly. Both solids are fee, and the mutual solubility of solid Pb and Al is negligible. Despite a large difference in lattice parameter, it has been found that inclusions follow a parallel-cube orientation relationship and their equilibrium shape is a cuboctahedron, bounded by ﹛111﹜ and ﹛100﹜ facets [1]. Following Herring, the relative extent of the two types of facet directly indicates a ratio of interfacial energies γl00/γ111- However, recent investigations have shown that for inclusions in the range of a few to a few tens of nanometers the equilibrium shape becomes a function of size [2].

In the present work, this size dependence of the equilibrium shape has been investigated further. Al alloys with about lat.% Pb were prepared by rapid solidification or by ion implantation, and equilibrated by annealing at about 300°C.

Type
Atomic Structure and Mechanisms at Interfaces in Materials
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 629 - 630
Copyright
Copyright © Microscopy Society of America 1997

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References

Moore, K.L., Zhang, D.L. and Cantor, B., Acta Met. Mat. 38,1327 (1990)10.1016/0956-7151(90)90205-UCrossRefGoogle Scholar
Schmidt, B., MSc thesis, University of Copenhagen, (1992); Dahmen, U., Xiao, S.Q., Paciornik, S., Johnson, E. and Johansen, A., Phys. Rev. Lett. 78,471 (1997)Google Scholar
This work was supported by the Director, Office of Basic Energy Sciences, Materials Science Division, US Department of Energy, under contract DE-AC3-76SF00098Google Scholar