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Containerless low gravity processing of glass forming and immiscible alloys
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Robinson, M. B. Briggs, Craig Andrews, J. Barry |
| Copyright Year | 1990 |
| Description | Under normal one-g conditions immiscible alloys segregate extensively during solidification due to sedimentation of the more dense of the immiscible liquid phases. Immiscible (hypermonotectic) gold-rhodium alloys were processed in the 100 meter drop tube under low gravity, containerless conditions to determine the feasibility of producing dispersed structures. Three alloy compositions were utilized. Alloys containing 10 percent by volume of the gold-rich hypermonotectic phase exhibited a tendency for the gold-rich liquid to wet the outer surface of the samples. This wetting tendency led to extensive segregation in several cases. Alloys containing 80 and 90 percent by volume of the gold-rich phase possessed completely different microstructures from the 10 percent samples when processed under low-g, containerless conditions. Several samples exhibited microstructures consisting of well dispersed 2 to 3 microns diameter rhodium-rich spheres in a gold-rich matrix. |
| File Size | 865362 |
| Page Count | 22 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900019431 |
| Archival Resource Key | ark:/13960/t7gr1tc4t |
| Language | English |
| Publisher Date | 1990-09-01 |
| Access Restriction | Open |
| Subject Keyword | Materials Processing Binary Alloys Metallic Glasses Containerless Melts Gold Alloys Liquid Phases Monotectic Alloys Rhodium Alloys Drop Towers Dispersions Microstructure Microgravity 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 |
