Abstract
The microstructure stability and creep properties of Ir-base refractory super-alloys (It-Nb and Ir-Zr) with an fcc and Ll 2 two-phase structure were investigated. An orderly arrayed structure composed of cuboidal coherent Ll 2 precipitates was observed in the Ir-Nb alloys. By a different heat treatment, a maze structure and a discontinuous coarsened lamellar structure were obtained in the Ir-Zr alloys. Creep behavior was investigated for samples with these three kinds of microstructure between 1 500 and 1 800°C. The creep behavior was explained according to microstructural changes before and after creep.
| Original language | English |
|---|---|
| Pages (from-to) | 2-7 |
| Number of pages | 6 |
| Journal | JSME International Journal, Series A: Solid Mechanics and Material Engineering |
| Volume | 45 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2002 Jan |
Keywords
- Cuboidal precipitates
- Lamellar structure
- Maze structure
- Precipitation hardening
ASJC Scopus subject areas
- Materials Science(all)
- Mechanical Engineering