Abstract
The isotherms of the Ir-Ni-Al in the composition range up to 50 at% Al are presented at 1573 K. The phase constitution and microstructure of the Ir-Ni-Al alloys were examined using X-ray diffractometry (XRD), scanning electron microscopy (SEM) with an electron probe microanalyzer (EPMA), and transmission electron microscopy (TEM) after heat treatment at 1573 K for 168 h. The B2-NiAl and B2-IrAl phases connected with each other at 1573 K. The highest solubility limit of Ir into Ni3Al was about 3.5 at% in the tested alloys. Then, a wide fcc + B2 and a narrow fcc + L12 and B2 + L12 two-phase region appeared in the isothermal section. In part of the B2 phase, a martensitic transformation from the B2 to the L10 phase was observed.
Original language | English |
---|---|
Pages (from-to) | 479-488 |
Number of pages | 10 |
Journal | Intermetallics |
Volume | 15 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2007 Apr |
Externally published | Yes |
Keywords
- A. Nickel aluminides, based on NiAl
- A. Nickel aluminides, based on NiAl
- B. Phase diagrams
- D. Martensitic structure
- D. Microstructure
ASJC Scopus subject areas
- Chemistry(all)
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry