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Compositional Profiling of Rapidly Solidified Cellular Structures

Published online by Cambridge University Press:  25 February 2011

Terrence M. Mackey and
Thomas F. Kelly
Terrence M. Mackey
Affiliation:
Dept. of Metallurgical & Mineral Engineering, University of Wisconsin, Madison, Wisconsin 53706
Thomas F. Kelly
Affiliation:
Dept. of Metallurgical & Mineral Engineering, University of Wisconsin, Madison, Wisconsin 53706
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Abstract

Solute partitioning during rapid solidification is being studied in cellular growth structures produced via pulsed-laser melting of binary alloys. This rapid solidification process can generate significant departures from local equilibrium at the liquid-solid interface which directly affects the resultant microsegregation patterns. Calculated compositional profiles are obtained from a solidification model incorporating the effects of both solute trapping and solute buildup with a suitable tip stability criterion. These are compared to experimentally determined campositional profiles generated across the steady-state cellular regrowth region of the melt pool using STEM x-ray microanalysis.

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