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Diffusion in thoriated and nonthoriated nickel and nickel-chromium alloys at 1260 c
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Whittenberger, J. D. |
| Copyright Year | 1972 |
| Description | Various solid-solid diffusion couples were assembled from thoriated and nonthoriated nickel-base alloys, welded, and diffusion annealed at 1260 C. Concentration profiles indicated that a thoria dispersion does not affect diffusion in Cr(alloy):Ni and Ni-4.8Al:Ni types of couples unless a fine grain structure is retained by the thoria particles. Metallography revealed the presence of thoria-free bands in the thoriated-Ni side of the diffusion zone. The bands contained grain boundaries and, in some cases, non-Kirkendall porosity. A mechanism based on the operation of vacancy sources is proposed to explain the thoria-free bands. In addition, a particular DS-NiCr:Ni couple had negligible Kirkendall porosity. This behavior was related to the grain structure of the particular lot of DS-NiCr. |
| File Size | 2631976 |
| Page Count | 43 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19720015885 |
| Archival Resource Key | ark:/13960/t0tr0p41c |
| Language | English |
| Publisher Date | 1972-05-01 |
| Access Restriction | Open |
| Subject Keyword | Materials, Metallic Nickel Alloys Kirkendall Effect High Temperature Research Porosity Chromium Alloys Diffusion Thorium 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 |
