Liquid Permeability Measurements in Solidifying Aluminum-Copper Alloys

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Measurements of liquid permeability in the mushy zones of AI-15.42% Cu and Al-8.68% Cu alloy samples have been performed isothermally just above the eutectic temperature, using eutectic liquid as the fluid. A modified method has been developed to determine the specific permeability, K{sub s}, as a function of time during the test from the data collected on these alloys. Factors affecting permeability measurements are discussed. Permeabilities are observed to vary throughout the experiment. This is attributed to microstructural coarsening and channeling that occurs in the sample during the experiment. The permeability is related to the microstructure of the sample using ... continued below

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8 p.

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Duncan, A.J.; Han, Q. & Viswanathan, S. February 28, 1999.

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Description

Measurements of liquid permeability in the mushy zones of AI-15.42% Cu and Al-8.68% Cu alloy samples have been performed isothermally just above the eutectic temperature, using eutectic liquid as the fluid. A modified method has been developed to determine the specific permeability, K{sub s}, as a function of time during the test from the data collected on these alloys. Factors affecting permeability measurements are discussed. Permeabilities are observed to vary throughout the experiment. This is attributed to microstructural coarsening and channeling that occurs in the sample during the experiment. The permeability is related to the microstructure of the sample using the Kozeny-Carman equation. The correlation between the measured K{sub s}, liquid fraction, g{sub L} and the specific solid surface area, S{sub v}, improves markedly when compared to previous studies in which microstructural coarsening was ignored.

Physical Description

8 p.

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OSTI as DE00002924

Medium: P; Size: 8 pages

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  • TMS Annual Meeting, San Diego, CA (US), 02/28/1999--03/04/1999

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  • Report No.: ORNL/CP-100520
  • Report No.: EE 04 01 00 0
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 2924
  • Archival Resource Key: ark:/67531/metadc679856

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Office of Scientific & Technical Information Technical Reports

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  • February 28, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 11, 2017, 5:59 p.m.

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Duncan, A.J.; Han, Q. & Viswanathan, S. Liquid Permeability Measurements in Solidifying Aluminum-Copper Alloys, article, February 28, 1999; Tennessee. (digital.library.unt.edu/ark:/67531/metadc679856/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.