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Primary Dendrite Array: Observations from Ground-Based and Space Station Processed SamplesInfluence 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.
Document ID
20130001728
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Tewari, Surendra N. (Cleveland State Univ. Cleveland, OH, United States)
Grugel, Richard N. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Erdman, Robert G. (Arizona Univ. Tucson, AZ, United States)
Poirier, David R. (Arizona Univ. Tucson, AZ, United States)
Date Acquired
August 27, 2013
Publication Date
November 19, 2012
Subject Category
Space Processing
Report/Patent Number
M12-1916
Meeting Information
Meeting: Fifth International Conference on Solidification Science and Processing (ICSSP5)
Location: Bhubaneswar
Country: India
Start Date: November 19, 2012
End Date: November 22, 2012
Distribution Limits
Public
Copyright
Public Use Permitted.

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