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A thermodynamic prediction for microporosity formation in aluminum-rich Al-Cu alloysA computer model is used to predict the formation and degree of microporosity in a directionally solidified Al-4.5 wt pct Cu alloy, considering the interplay between solidification shrinkage and gas porosity. Macrosegregation theory is used to determine the local pressure within the interdendritic liquid. Results show interdendritic porosity for initial hydrogen contents in the 0.03-1 ppm range, and none below contents of 0.03. An increase in either the thermal gradient or the solidification rate is show to decrease the amount of interdendritic porosity.
Document ID
19880031659
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Poirier, D. R.
(Arizona Univ. Tucson, AZ, United States)
Yeum, K.
(Arizona, University Tucson, United States)
Maples, A. L.
(Arizona Univ. Tucson, AZ, United States)
Date Acquired
August 13, 2013
Publication Date
November 1, 1987
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 18A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
88A18886
Funding Number(s)
CONTRACT_GRANT: NAG3-723
Distribution Limits
Public
Copyright
Other

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