caa a22 4500 463210972 CHVBK 20180405153140.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s00339-007-3943-7 doi (NATIONALLICENCE)springer-10.1007/s00339-007-3943-7 Sands D. Department of Physical Sciences, University of Hull, HU6 7RX, Hull, UK aut New theory of undercooling during rapid solidification: application to pulsed laser heated silicon [Elektronische Daten] [D. Sands] A new theory of undercooling has been developed based on the Fickian form of heat flux expressed in terms of a gradient in enthalpy density. It is shown that heat diffusion is more fundamental than Fourier's law of heat conduction. During the solid-liquid phase change, diffusion requires continuity of the enthalpy density across the phase-change boundary, which has two important consequences. First, the calculated melt-depth during rapid heating is reduced, and second, during cooling the rate of loss of heat is independent of both the rate of release of latent heat and the temperature of the interphase layer. The cause of undercooling is diffusive heat loss without recrystallisation, which simply causes the temperature of the liquid to drop. Both the nature of melting and classical nucleation have been examined and shown to support diffusion over conduction. In particular, it is established that the literature supports a model of melting in which phase fluctuations at the melting point occur, and that these phase fluctuations must inevitably lead to thermal transport at uniform temperature. Hitherto unrecognized inconsistencies in classical nucleation theory also support the diffusive framework. The model is applied to pulsed laser melting and amorphisation of (111) silicon. Springer-Verlag, 2007 Applied Physics A Springer-Verlag 88/1(2007-07-01), 179-189 0947-8396 88:1<179 2007 88 339 https://doi.org/10.1007/s00339-007-3943-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-3943-7 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Sands D. Department of Physical Sciences, University of Hull, HU6 7RX, Hull, UK aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 88/1(2007-07-01), 179-189 0947-8396 88:1<179 2007 88 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer