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The transient oxidation of single crystal nial+zr. m.s. thesis. final report
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Doychak, J. K. |
| Copyright Year | 1983 |
| Description | The 800 C oxidation of oriented single crystals of Zr doped beta-NiAl was studied using transmission electron microscopy. The oxide phases and metal-oxide orientation relationships were determined to characterize the transient stages of oxidation prior to the transformation to or formation of alpha-Al2O3. On (001) and (012) metal orientations, NiAl2O4 was the first oxide to form followed by delta-Al2O3 which becomes the predominant oxide phase. All oxides were highly epitaxially related to the metal; the orientation relationships being function of parallel cation close-packed directions in the meta and oxide. On (011) and (111) metal orientations, gamma-Al2O3 became the predominant oxide phase rather than delta-Al2O3, indicating a structural stability from the highly epitaxial oxides. The relative concentration of aluminum in the oxide scales increased with time indicating preferential gamma-or delta-Al2O3 growth. The striking feature common to the orientation relationships is the alignment of 100 m and 110 ox directions, believed to result from the minimal 3 percent mismatch between the corresponding (100)m and (110)ox planes. |
| File Size | 9152761 |
| Page Count | 246 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850002913 |
| Archival Resource Key | ark:/13960/t9j43kx4t |
| Language | English |
| Publisher Date | 1983-09-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Crystal Growth Nickel Alloys Aluminum Alloys Electron Microscopy Orientation Corrosion Resistance Single Crystals Zirconium Transmission Electron Microscopy Doped Crystals Heat Resistant Alloys Oxidation Aluminum Oxides Crystal Structure Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Thesis |
