Morphology of cellular precipitation of tin from lead-tin bicrystals-ii

King-Ning Tu*, D. Turnbull

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

99 Scopus citations

Abstract

Additional observations are reported on the morphology of cellular precipitation of tin from Pb(Sn) bicrystals misoriented by tilts from a [100] axis. No interconnection between tin lamellae were observed and the evidence indicates that individual formation of tin plates at the boundary in the special crystal-lographic orientation, is an important, and probably the predominant, mechanism for the formation of tin lamellae, including their multiplication within a colony. When the temperature is abruptly lowered during cell growth the readjustment in lamellae spacing is effected by nucleation on the cell boundary of new lamellae between those already existing. When the temperature is raised abruptly during cell growth large sections of the cell boundary sometimes become detached from existing lamellae. Further movement of the boundary must then await nucleation of a new set of lamellae. Nucleation of tin plates lying on the grain boundary in the special erystallographic orientation requires, in general, that a small region of the boundary be deformed through an angle, φ. We have formulated an expression for the free energy of forming a special nucleus taking account of the boundary deformation. Cell boundary orientations favorable for the formation of special nuclei will exist at one of the cell edges and in sections of the boundary which are passing around obstacles. We propose a model for the multiplication of tin lamellae within a colony which is based on these concepts.

Original languageEnglish
Pages (from-to)1317-1323
Number of pages7
JournalActa Metallurgica
Volume15
Issue number8
DOIs
StatePublished - 1 Jan 1967

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