Abstract
WHEN metallic sodium is added to a eutectic aluminium–silicon alloy, the structure of the eutectic silicon is modified by a mechanism which has been described by several authors1–4. Sodium also modifies the structure of primary silicon crystals in this system, and various workers1,5 have stated that a spheroidal form of silicon can be obtained by this means. Evidence that these spherical particles are true Spherulites has not been provided and I wish to describe some preliminary experiments carried out to ascertain the morphology and possible crystallography of these interesting particles.
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References
Davies, V. de L., and West, J. M., J. Inst. Metals, 92, No. 6, 175 (1963–64).
Bell, J. A. E., and Winegard, W. C., Nature, 208, 177 (1965).
Day, M. G., and Hellawell, A., J. Inst. Metals, 95, 377 (1968).
Day, M. G., and Hellawell, A., Proc. Roy. Soc., A, 305, 473 (1968).
Mascré, C., Proc. Inst. Brit. Foundrymen, 46, 227 (1953).
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DAY, M. Primary Silicon Spherulites in Aluminium–Silicon Alloys. Nature 219, 1357–1358 (1968). https://doi.org/10.1038/2191357a0
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DOI: https://doi.org/10.1038/2191357a0
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