NDLI: Primary dendrite array: observations from ground-based and space station processed samples (Document No: 20130001728)

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Primary dendrite array: observations from ground-based and space station processed samples (Document No: 20130001728)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Grugel, Richard N. Erdman, Robert G. Tewari, Surendra N. Poirier, David R.
Copyright Year	2012
Description	Influence of natural convection on primary dendrite array morphology during directional solidification is being investigated under a collaborative European Space Agency-NASA joint research program, Microstructure Formation in Castings of Technical Alloys under Diffusive and Magnetically Controlled Convective Conditions (MICAST). Two Aluminum-7 wt pct Silicon alloy samples, MICAST6 and MICAST7, were directionally solidified in microgravity on the International Space Station. Terrestrially grown dendritic monocrystal cylindrical samples were remelted and directionally solidified at 18 K per centimeter (MICAST6) and 28 K per centimeter (MICAST7). Directional solidification involved a growth speed step increase (MICAST6-from 5 to 50 millimeters per second) and a speed decrease (MICAST7-from 20 to 10 millimeters per second). Distribution and morphology of primary dendrites is currently being characterized in these samples, and also in samples solidified on earth under nominally similar thermal gradients and growth speeds. Primary dendrite spacing and trunk diameter measurements from this investigation will be presented.
File Size	7937
Page Count	1
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20130001728
Archival Resource Key	ark:/13960/t4sj6gf5v
Language	English
Publisher Date	2012-11-19
Access Restriction	Open
Subject Keyword	Space Processing Single Crystals Silicon Alloys International Space Station Melting Directional Solidification Crystals Dendritic Crystals Aluminum Temperature Gradients Microstructure Microgravity Convection Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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