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Eutectic Experiment Development for Space ProcessingA ground base test plan and a specimen evaluation scheme have been developed for the aluminum-copper eutectic solidification experiment to be run in the M518 multipurpose electric furnace during the Skylab mission. Besides thermal and solidification studies a detailed description is given of the quantitative metallographic technique which is appropriate for characterizing eutectic structures. This method should prove a key tool for evaluating specimen microstructure which is the most sensitive indicator of changes produced during solidification. It has been recommended that single grain pre-frozen eutectic specimens be used to simplify microstructural evaluation and to eliminate any porosity in the as-cast eutectic specimens. High purity (99.999%) materials from one supplier should be employed for all experiments. Laboratory studies indicate that porosity occurs in the MRC as-cast eutectic ingots but that this porosity can be eliminated by directional freezing. Chemical analysis shows that the MRC ingots are slightly Al rich and contain about .03% impurity. Because of the impurity content the lower cooldown rate (1.2 C/min) should be used for eutectic freezing if MRC material is used in the M518 furnace.
Document ID
19730009799
Acquisition Source
Headquarters
Document Type
Contractor Report (CR)
Authors
Hopkins, R. H.
(Westinghouse Research Labs. Pittsburgh, PA, United States)
Date Acquired
September 2, 2013
Publication Date
November 14, 1972
Subject Category
Materials, Metallic
Report/Patent Number
NASA-CR-124103
Accession Number
73N18526
Funding Number(s)
CONTRACT_GRANT: NAS8-21905
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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