Abstract
The microstructure evolution of four samples belonging to two Ir-based ternary systems, Ir-Nb-Al and Ir-Zr-Al, has been investigated by microstructure observation using scanning electron microscopy (SEM), phase composition analysis using electron probe microscopy analysis (EPMA) methods, and phase structure determination using X-ray diffraction (XRD) patterns. An fcc/L12 two-phase structure was detected in all of the samples. One Ir-Nb-Al alloy with a composition near the Ir side of the phase diagram has been found to exhibit a microstructure similar to that of Ni-based superalloys with cuboidal L12-Ir3Nb precipitates embedded in an fcc-Ir matrix. The lattice misfit between the fcc and L12 phases of these samples has been estimated.
Original language | English |
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Pages (from-to) | 1287-1290 |
Number of pages | 4 |
Journal | Materials Letters |
Volume | 62 |
Issue number | 8-9 |
DOIs | |
Publication status | Published - 2008 Mar 31 |
Externally published | Yes |
Keywords
- Ir-based superalloys
- Metals and alloys
- Microstructure
- fcc/L1 two-phase structure
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering