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The genesis of the cellular precipitation reaction

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Abstract

The morphology of cellular precipitation in a Cu-9.5 at. pet In alloy has been investigated by light and electron microscopy. Both cellular and general precipitation were observed to occur simultaneously in quenched and aged alloys while only cellular precipitation was observed to occur in isothermally aged alloys. Because of the presence of wide, solute rich, precipitate free zones in the vicinity of grain boundaries in the quenched and aged alloys, the early development of cellular precipitation was found to be identical for both types of heat treatment. From light and electron microscopy observations of the early stages of cellular precipitation a mechanism for the formation of cells was developed. At the start of aging, the unoccupied grain boundary begins to migrate under the influence of grain boundary migration forces as if it were in a single phase alloy. As the boundary migrates, solute segregates along it to form allotriomorphs which pin the boundary. The boundary continues to migrate and bows between the simultaneously forming allotriomorphs. With further aging, the allotriomorphs lengthen following the bowing boundary and the allotriomorphs become the initial precipitate lamellae of the developing cell as a steady-state lamellar structure develops. Assuming that the critical step in the development of a cell is the ability of the boundary to bow between the initial allotriomorphs, a criterion for the occurrence of cellular precipitation was developed.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Marquette University, 53233, Milwaukee, Wisconsin

    R. A. Fournelle (Assistant Professor)

  2. Metallurgical Engineering, University of Missouri-Rolla, 65401, Rolla, Missouri

    J. B. Clark (Professor)

Authors
  1. R. A. Fournelle
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  2. J. B. Clark
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Additional information

R. A. FOURNELLE, formerly Graduate Student, University of Missouri-Rolla

This paper is based on a presentation made at a symposium on “The Cellular and the Pearlite Reactions,” held at the Detroit Meeting of The Metallurgical Society of AIME, October 20, 1971, under the sponsorship of the IMD Heat Treatment Committee.

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Fournelle, R.A., Clark, J.B. The genesis of the cellular precipitation reaction. Metall Trans 3, 2757–2767 (1972). https://doi.org/10.1007/BF02652842

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