Columnar dendritic solidification in a metal- matrix composite View Full Text


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Article Info

DATE

1988-03

AUTHORS

Andreas Mortensen, J. A. Cornie, M. C. Flemings

ABSTRACT

Results are presented of a study on columnar dendritic solidification of the matrix of a fibrous metal-matrix composite, the fibers of which are aligned SiC fibers 140 m in diameter and the matrix of which is Al-4.5 wt pct Cu. Samples were produced by pressure infiltration of the metal-matrix into a preform of the fibers. The matrix was subsequently remelted and resolidified under controlled thermal gradient and growth rate. Dendrite growth begins in the center of the interstices left between the fibers. The dendrite tip temperature is not significantly influenced by the fibers, but the usual linear dependency of dendrite arm spacing ont1/3 (wheret is time during solidification) is altered significantly in the narrower interstices at long solidification times. The underlying mechanism is dendrite arm coalescence which takes place at a sufficiently rapid rate in the composite that the microstructure gradually becomes nondendritic. The solid/liquid interface then is parallel to the matrix/fiber interface. A model is presented for the kinetics of dendrite arm coalescence and compared with experimental results. The amount of microsegregation that was found in the matrix within interstices is significantly less than that found in the usual cast alloy, especially at long solidification times (low cooling rates). The mechanism responsible for the observed reduction in microsegregation is solid-state diffusion which is enhanced in the composite by the fact that the fibers place an upper limit on the dendrite arm spacing, and hence on the required diffusion distance. More... »

PAGES

709-721

References to SciGraph publications

  • 1984-03. Dendrite morphology and primary spacing in hypoeutectic Al-Cu alloys in JOURNAL OF MATERIALS SCIENCE LETTERS
  • 1985-06. Silicon carbide filaments: Microstructure in JOURNAL OF MATERIALS SCIENCE
  • 1985-10. Cellular and dendritic growth: Part I. Experiment in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1975-01. The dendrite arm spacings of aluminum-copper alloys solidified under steady-state conditions in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1984-06-01. A Numerical Finite Difference Model of Steady State Cellular and Dendritic Growth in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1977-11. The measurement of liquid diffusion coefficients in the Al-Cu system using temperature gradient zone melting in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf02649285

    DOI

    http://dx.doi.org/10.1007/bf02649285

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