Solidification processing of functionally graded materials by sedimentation

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (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 the interplay between the freezing front propagation and particle sedimentation. Experiments were performed in a rectangular ingot using pure substances as the matrix and glass beads as the particle phase. The time evolutions of local particle volume fractions were measured by bifurcated fiber optical probes working in the reflection mode. The effects of various 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 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 the validated computer code was used as a tool for efficient computational prototyping of an Al/SiC FGM.

Original languageEnglish (US)
Title of host publicationAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
PublisherASME
Pages289-301
Number of pages13
ISBN (Print)0791816567
StatePublished - Dec 1 1999
EventHeat Transfer Division - 1999 ((The ASME International Mechanical Engineering Congress and Exposition) - Nashville, TN, USA
Duration: Nov 14 1999Nov 19 1999

Publication series

NameAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume364-2
ISSN (Print)0272-5673

Other

OtherHeat Transfer Division - 1999 ((The ASME International Mechanical Engineering Congress and Exposition)
CityNashville, TN, USA
Period11/14/9911/19/99

Fingerprint

Functionally graded materials
Sedimentation
Solidification
Ingots
Volume fraction
Processing
Finite volume method
Freezing
Optical fibers
Gravitation
Casting
Cooling
Glass
Experiments
Temperature

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

Gao, J. W., Stewart, S. W., & Wang, C. (1999). Solidification processing of functionally graded materials by sedimentation. In American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD (pp. 289-301). (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD; Vol. 364-2). ASME.
Gao, J. W. ; Stewart, Susan W. ; Wang, Chao-yang. / Solidification processing of functionally graded materials by sedimentation. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. ASME, 1999. pp. 289-301 (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD).
@inproceedings{c1d354018a6746a5bf740e44fd120063,
title = "Solidification processing of functionally graded materials by sedimentation",
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 the interplay between the freezing front propagation and particle sedimentation. Experiments were performed in a rectangular ingot using pure substances as the matrix and glass beads as the particle phase. The time evolutions of local particle volume fractions were measured by bifurcated fiber optical probes working in the reflection mode. The effects of various 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 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 the validated computer code was used as a tool for efficient computational prototyping of an Al/SiC FGM.",
author = "Gao, {J. W.} and Stewart, {Susan W.} and Chao-yang Wang",
year = "1999",
month = "12",
day = "1",
language = "English (US)",
isbn = "0791816567",
series = "American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD",
publisher = "ASME",
pages = "289--301",
booktitle = "American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD",

}

Gao, JW, Stewart, SW & Wang, C 1999, Solidification processing of functionally graded materials by sedimentation. in American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, vol. 364-2, ASME, pp. 289-301, Heat Transfer Division - 1999 ((The ASME International Mechanical Engineering Congress and Exposition), Nashville, TN, USA, 11/14/99.

Solidification processing of functionally graded materials by sedimentation. / Gao, J. W.; Stewart, Susan W.; Wang, Chao-yang.

American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. ASME, 1999. p. 289-301 (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD; Vol. 364-2).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Solidification processing of functionally graded materials by sedimentation

AU - Gao, J. W.

AU - Stewart, Susan W.

AU - Wang, Chao-yang

PY - 1999/12/1

Y1 - 1999/12/1

N2 - A combined experimental and numerical investigation of the solidification process during gravity casting of functionally graded materials (FGMs) is conducted. Focus is placed on the interplay between the freezing front propagation and particle sedimentation. Experiments were performed in a rectangular ingot using pure substances as the matrix and glass beads as the particle phase. The time evolutions of local particle volume fractions were measured by bifurcated fiber optical probes working in the reflection mode. The effects of various 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 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 the validated computer code was used as a tool for efficient computational prototyping of an Al/SiC FGM.

AB - A combined experimental and numerical investigation of the solidification process during gravity casting of functionally graded materials (FGMs) is conducted. Focus is placed on the interplay between the freezing front propagation and particle sedimentation. Experiments were performed in a rectangular ingot using pure substances as the matrix and glass beads as the particle phase. The time evolutions of local particle volume fractions were measured by bifurcated fiber optical probes working in the reflection mode. The effects of various 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 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 the validated computer code was used as a tool for efficient computational prototyping of an Al/SiC FGM.

UR - http://www.scopus.com/inward/record.url?scp=0033348697&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033348697&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0033348697

SN - 0791816567

T3 - American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD

SP - 289

EP - 301

BT - American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD

PB - ASME

ER -

Gao JW, Stewart SW, Wang C. Solidification processing of functionally graded materials by sedimentation. In American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. ASME. 1999. p. 289-301. (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD).