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Processing eutectics in space (Document No: 19760011095)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Douglas, F. C. Galasso, S. F. |
| Copyright Year | 1975 |
| Description | The investigations of directional solidification have indicated the necessity of establishing a secure foundation in earth-based laboratory processing in order to properly assess low-gravity processing. Emphasis was placed on evaluating the regularity of microstructure of the rod-like eutectic Al-Al3Ni obtained under different conditions of growth involving the parameters of thermal gradient, solidification rate, and interfacial curvature. In the case of Al-Al3Ni, where the Al3Ni phase appears as facets rods, solidification rate was determined to be a controlling parameter. Zone melting of thin eutectic films showed that for films of the order of 10 to 20 micrometers thick, the extra surface energy appears to act to stabilize a regular microstructure. The results suggest that the role of low-gravity as provided in space-laboratory processing of materials is to be sought in the possibility of generating a higher thermal gradient in the solidifying ingot for a given power input-output arrangement than can be obtained under normal one-g processes. |
| File Size | 43032544 |
| Page Count | 73 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19760011095 |
| Archival Resource Key | ark:/13960/t0ns5j44v |
| Language | English |
| Publisher Date | 1975-11-01 |
| Access Restriction | Open |
| Subject Keyword | Astronautics (general) Thin Films Space Manufacturing Microgravity Applications Nickel Alloys Eutectics Space Commercialization Aluminum Alloys Microstructure Surface Energy 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 |
