NDLI: Eutectic experiment development for space processing

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Eutectic experiment development for space processing

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hopkins, R. H.
Copyright Year	1972
Description	A 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.
File Size	6253913
Page Count	99
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19730009799
Archival Resource Key	ark:/13960/t3qv89358
Language	English
Publisher Date	1972-11-14
Access Restriction	Open
Subject Keyword	Materials, Metallic Furnaces Copper Alloys Space Commercialization Aluminum Alloys Skylab Program Metallography Eutectic Alloys Microstructure Solidification Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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