Abstract
Precipitation was studied from f c c solid solutions with silicon, germanium, copper and magnesium. Of all these elements only silicon and germanium form diamond cubic (d c) precipitates in f c c Al. Nucleation of the d c structure is enhanced if both types of atom are dissolved in the f c c lattice. This is interpreted as due to atomic size effects in the pre-nucleation stage. There are two modes of interference of fourth elements with nucleation of the d c phase in Al + Si, Ge. The formation of the d c phase is hardly affected if the atoms (for example, copper) are rejected from the (Si, Ge)-rich clusters. If additional types of atom are attracted by silicon and/or germanium, d c nuclei are replaced by intermetallic compounds (for example Mg2Si).
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Hornbogen, E., Mukhopadhyay, A.K. & Starke, E.A. Nucleation of the diamond phase in aluminium-solid solutions. J Mater Sci 28, 3670–3674 (1993). https://doi.org/10.1007/BF01159852
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DOI: https://doi.org/10.1007/BF01159852