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Issues concerning the oxidation of ni(pt)ti shape memory alloys
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Smialek Sr., James |
| Copyright Year | 2011 |
| Description | The oxidation behavior of the Ni-30Pt-50Ti high temperature shape memory alloy is compared to that of conventional NiTi nitinol SMAs. The oxidation rates were ~1/4 those of NiTi under identical conditions. Ni-Ti-X SMAs are dominated by TiO2 scales, but, in some cases, the activation energy diverges for unexplained reasons. Typically, islands of metallic Ni or Pt(Ni) particles are embedded in lower scale layers due to rapid selective growth of TiO2 and low oxygen potential within the scale. The blocking effect of Pt-rich particles and lower diffusivity of Pt-rich depletion zones are proposed to account for the reduction in oxidation rates. |
| File Size | 1145493 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20120004168 |
| Archival Resource Key | ark:/13960/t58d4ws9q |
| Language | English |
| Publisher Date | 2011-10-09 |
| Access Restriction | Open |
| Subject Keyword | Metals And Metallic Materials Binary Alloys Titanium Alloys Shape Memory Alloys Depletion Nickel Alloys Heat Resistant Alloys Embedding Oxidation Metal Particles Diffusivity 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 |
