Heat Flow Limitations in Rapid Solidification Processing
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The term Rapid Solidification Processing, RSP, is equally applicable to the formation of both crystalline and non-crystalline solid phases by quenching of a material from an initial liquid state. During RSP cooling rate in the liquid prior to solidification affects nucleation (undercooling) and growth phenomena in important ways — it influences undercooling in crystalline solidification and is an overriding factor in the formation of non-crystalline structures. On the other hand, the fineness of a crystalline microstructure (e.g. segregate spacing, size of second phase particles, etc.) can usually be correlated to average cooling rate during solidification or time available for coarsening. Thus, a clear distinction must be made between cooling rates in the liquid (or during noncrystalline solidification) and during crystalline solidification; the latter is significantly lower at equivalent rates of external heat extraction due to the heat of fusion.
KeywordsHeat Transfer Coefficient Heat Flow Biot Number Interface Velocity Rapid Solidification Processing
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- 1.C. G. Levi, R. Mehrabian, submitted for publication to Met. Trans.Google Scholar
- 2.R. Mehrabian; Proceedings of Conference on Rapid Solidification Processing, Principles and Technologies, Nov. 1977, Reston, Virginia, p. 7. R. Mehrabian, B. H. Kear and M. Cohen, Eds., Claitor Publishing Division, 1978.Google Scholar
- 3.P. Predecki, A. W. Mellendore and N. J. Grant, Trans. Met. Soc. AIME, 1969, Vol. 233, p. 1581.Google Scholar
- 4.D. R. Harbur, J. W. Anderson and W. J. Maraman, Trans. Met. Soc. AIME, 1969, Vol; 245, p. 1055.Google Scholar
- 6.S. Hong, D. G. Backman and R. Mehrabian, submitted for publication to Met. Trans.Google Scholar
- 10.F. Spaepen and D. Turnbull; Proceedings of Second International Conference on Rapidly Quenched Metals. Edited by N. J. Grant and B. L. Giessen, 1975, M.I.T. Press, Cambridge, Mass., p. 205.Google Scholar
- 12.S. C. Hsu, S. Kou and R. Mehrabian, submitted for publication to Met. Trans.Google Scholar