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Convection in Pulsed Laser Formed Melts

Published online by Cambridge University Press:  15 February 2011

G. E. Possin ,
H. G. Parks  and
S. W. Chiang
G. E. Possin
Affiliation:
General Electric Research and Development Center Schenectady, New York, 12301 USA
H. G. Parks
Affiliation:
General Electric Research and Development Center Schenectady, New York, 12301 USA
S. W. Chiang
Affiliation:
General Electric Research and Development Center Schenectady, New York, 12301 USA
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Abstract

In this paper we treat surface tension driven convection effects in pulsed laser formed melts. Mass transport is determined from an approximate solution of the Navier Stokes equation. It is shown that for small laser spot diameters the characteristic mixing times are on the order of 100's of ns. The dependence of the convection mechanism on material and laser parameters is discussed and extended to thin metal films on Si. Experimental results substantiating the theoretical considerations are presented.

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References

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