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Detachment of tertiary dendrite arms during controlled directional solidification in aluminum - 7 wt percent silicon alloys: observations from ground-based and microgravity processed samples
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Grugel, Richard N. Van Hoose, James R. Poirier, David Tewari, Surendra Erdman, Robert |
| Copyright Year | 2012 |
| Description | Electron Back Scattered Diffraction results from cross-sections of directionally solidified aluminum 7wt% silicon alloys unexpectedly revealed tertiary dendrite arms that were detached and mis-oriented from their parent arm. More surprisingly, the same phenomenon was observed in a sample similarly processed in the quiescent microgravity environment aboard the International Space Station (ISS) in support of the joint US-European MICAST investigation. The work presented here includes a brief introduction to MICAST and the directional solidification facilities, and their capabilities, available aboard the ISS. Results from the ground-based and microgravity processed samples are compared and possible mechanisms for the observed tertiary arm detachment are suggested. |
| File Size | 3273698 |
| Page Count | 36 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20120014196 |
| Archival Resource Key | ark:/13960/t0ps2s786 |
| Language | English |
| Publisher Date | 2012-03-11 |
| Access Restriction | Open |
| Subject Keyword | Space Processing Diffraction Patterns Silicon Alloys International Space Station Directional Solidification Crystals Aluminum Granular Materials Electron Diffraction Spaceborne Experiments Dendrites Microstructure Microgravity Steady State Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Presentation |
