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SPAR 5 experiment no. 74-30 agglomeration in immiscible liquidsThe influence of gravity, cooling rate, and composition on the macro-and microstructure of liquid phase immiscible alloys were researched. Aluminum indium alloys of compositions 30, 40, 70, and 90 weight percent indium were processed aboard two sounding rocket flights, SPAR 2 and SPAR 5. Radiographic and metallographic examination of the SPAR 2 flight and ground base samples showed the expected separation at lg of the ground base alloys into indium rich and aluminum rich layers. The flight alloys produced an aluminum rich core surrounding by indium rich metal. The results obtained from the SPAR 5 40 and 70 weight percent indium alloys were essentially identical to those from SPAR 2. The 30 and 90 weight percent indium alloys also showed massive separation into configuration similar to the 40 and 70 weight percent indium alloys. The 90 weight percent indium alloy showed additional evidence that surface tension induced droplet migration had occurred in this alloy which could at least in part account for the observed structures.
Document ID
19800016859
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Gelles, S. (Battelle Columbus Labs. OH, United States)
Markworth, A. J. (Battelle Columbus Labs. OH, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1979
Subject Category
Astronautics (General)
Report/Patent Number
NASA-CR-161473
Accession Number
80N25354
Funding Number(s)
CONTRACT_GRANT: NAS8-31543
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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