Abstract
The phase constituents of alloys from the (Ni,Co)85(Al,Ti) 15 plane of the Ni-Co-Al-Ti quaternary system were investigated following prolonged exposure at 750°C. Microstructural investigations confirmed the existence of a continuous A1-L12 two-phase region in the Ni-Co-Al-Ti quaternary system between Ni-Ni3Alif and Co-Co 3Ti. The lattice misfits of alloys from this quaternary system were determined using neutron diffraction. With increasing contents of Ti the positive lattice misfit increases up to +0.79% in the Ti-containing alloys, which leads to an increasing tetragonal distortion of the γ matrix phase due to the increasing coherency stresses.
Original language | English |
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Pages (from-to) | 399-404 |
Number of pages | 6 |
Journal | Advanced Materials Research |
Volume | 278 |
DOIs | |
State | Published - Jul 4 2011 |
Externally published | Yes |
Keywords
- Lattice misfit
- Neutron diffraction
- Ni-Co-superalloys
- Phase diagrams