Transport phenomena during solidification processing of functionally graded composites by sedimentation

J. W. Gao, C. Y. Wang

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A combined experimental and numerical investigation of the solidification process during gravity casting of functionally graded materials (FGMs) is conducted. Focus is placed on understanding the interplay between the freezing front dynamics and particle transport during solidification. Transparent model experiments were performed in a rectangular ingot using pure water and succinonitrile (SCN) as the matrix and glass beads as the particle phase. The time evolutions of local particle volume fractions were measured in situ by bifurcated fiber optical probes working in the reflection mode. The effects of important processing parameters were explored. It is found that there exists a particle-free zone in the top portion of the solidified ingot, followed by a graded particle distribution region towards the bottom. Higher superheat results in slower solidification and hence a thicker particle-free zone and a higher particle concentration near the bottom. The higher initial particle volume fraction leads to a thinner particle-free region. Lower cooling temperatures suppress particle settling. A one-dimensional multiphase solidification model was also developed, and the model equations were solved numerically using a fixed-grid, finite-volume method. The model was then validated against the experimental results and subsequently used as a tool for efficient computational prototyping of an Al/SiC FGM.

Original languageEnglish (US)
Pages (from-to)368-375
Number of pages8
JournalJournal of Heat Transfer
Volume123
Issue number2
DOIs
StatePublished - Apr 1 2001

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Sedimentation
solidification
Solidification
Functionally graded materials
composite materials
Composite materials
Ingots
Processing
Volume fraction
Finite volume method
Freezing
ingots
Optical fibers
Gravitation
Casting
Cooling
Glass
Water
succinonitrile
finite volume method

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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Transport phenomena during solidification processing of functionally graded composites by sedimentation. / Gao, J. W.; Wang, C. Y.

In: Journal of Heat Transfer, Vol. 123, No. 2, 01.04.2001, p. 368-375.

Research output: Contribution to journalArticle

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