Abstract
ALUMINIUM plates with large crystals, obtained by recrystallization of fine-grain material, show many crystals with a particular type of grain boundary: they appear as 'pointed' inclusions at the edge of large crystallites. In Fig. 1 a few examples of such 'pointed' crystals are indicated by C. From an analysis by Sandee1 (cf. also refs. 2 and 3) of the forms of the grain boundaries which may occur in recrystallized plates, assuming for each crystallite a constant linear growing velocity in all directions, it follows that such crystals have grown as a result of 'stimulation' by another crystal, so that their growth did not start until another crystal, the growth of which had started previously, reached the nucleus of the 'stimulated' crystal. In order to obtain a measurable size, the velocity of growth of the stimulated crystal must, at least at the beginning, be larger than that of the stimulating crystal.
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References
Sandee, J., Physica, 9, 741 (1942).
Burgers, W. G., Physica, 9, 987 (1942).
J. Inst. Metals, 54, 193 (1934).
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BURGERS, W. 'Stimulation Crystals' and Twin-formation in Recrystallized Aluminium. Nature 157, 76–77 (1946). https://doi.org/10.1038/157076a0
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DOI: https://doi.org/10.1038/157076a0
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