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Solidification Mechanism of Highly Undercooled Metal Alloys

Published online by Cambridge University Press:  15 February 2011

Yuh Shiohara ,
Men G. Chu ,
David G. Macisaac  and
Merton C. Flemings
Yuh Shiohara
Affiliation:
M.I.T., 77, Massachusetts Avenue, Cambridge, Massachusetts, USA
Men G. Chu
Affiliation:
M.I.T., 77, Massachusetts Avenue, Cambridge, Massachusetts, USA
David G. Macisaac
Affiliation:
M.I.T., 77, Massachusetts Avenue, Cambridge, Massachusetts, USA
Merton C. Flemings
Affiliation:
M.I.T., 77, Massachusetts Avenue, Cambridge, Massachusetts, USA
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Abstract

This paper describes the results of experiments on metal droplet undercooling, and presents a preliminary analysis of the structures obtained. Work was conducted with Sn-25wt%Pb and Ni-34wt%Sn alloys. To achieve the required high degrees of undercooling, emulsification treatments were utilized following techniques described by Perepezko and co-workers.

Experiments show the fraction of supersaturated primary phase is found to be a function of the amount of undercooling, as is the fineness of the structures. The solidification behavior of the tin-lead droplets during recalescence was analyzed using three different hypotheses; 1) solid forming throughout recalescence is of the maximumthermodynamically stable composition, 2) partitionless solidification below the “To” temperature, and solid forming thereafter is of the maximum thermodynamically stable composition, and 3) partitionless solidification below the “To” temperature with solid forming thereafter that is of the maximum thermodynamically metastable composition that is possible.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 8 , 1981 , 65
Copyright
Copyright © Materials Research Society 1982

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References

REFERENCES

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