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The melting point depression of tin in mechanically milled tin and germanium powder mixtures

Published online by Cambridge University Press:  31 January 2011

C. C. Koch ,
J. S. C. Jang  and
S. S. Gross
C. C. Koch
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695–7907
J. S. C. Jang
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695–7907
S. S. Gross*
Affiliation:
Corning Glass Works, Corning, New York 14831
*
a) Formerly Research Assistant at North Carolina State University.
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Abstract

A melting point depression, δTM, has been observed for Sn in Ge/Sn (50 at.% Sn) dispersions which were prepared by mechanical milling of Ge and Sn powders. Sn and Ge are immiscible and form a fine dispersion of the pure components when milled in a high energy ball mill. The magnitude of δTM, as measured by DSC, increases with milling time, i.e., with refinement of the dispersion. Melting is observed to begin as low as 36 °C below the equilibrium bulk melting temperature. The magnitude of δTM is reduced by about 25% after melting the Sn. Subsequent remelts do not change δTM further. Impurities cannot account for δTM. While stored energy of cold work may contribute to 25% of δTM before Sn is melted, it is concluded that the major contribution to δTM comes from the nucleation of disorder/melting at the Ge/Sn interfaces.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 3 , June 1989 , pp. 557 - 564
Copyright
Copyright © Materials Research Society 1989

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