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Science 25 June 1965:
Vol. 148. no. 3678, pp. 1717 - 1718
DOI: 10.1126/science.148.3678.1717
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Articles

Crystal Multiplication without Nucleation

Bruce Chalmers 1 and R. B. Williamson 2

1 Division of Engineering and Applied Physics, Harvard University, Cambridge, Massachusetts
2 Department of Civil Engineering, Massachusetts Institute of Technology, Cambridge

Disk-shaped ice crystals grow out from the surface of polycrystalline ice in undercooled water. The rupture of the neck of the attached disk is a means of multiplying the number of viable crystals in the surrounding undercooled water. This is a source of frazil ice in streams and a source of new crystals in metal castings which are grain-refined by stirring.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)