Microstructural investigation of the Co-11.0Ge-5.7W (at.%) ternary alloy was conducted. Fine cuboidal precipitates were observed in this alloy annealed at 1173 K and the crystal structure of the precipitate phase was identified as an L12 structure with a composition of Co-12.6Ge-8.2W (at.%). The solvus temperature of this phase was about 1180 K. Since a stable L12 phase has not been reported in the Co-W and Co-Ge binary systems, this ternary compound is a new L12 phase designated as γ′-Co3(Ge, W).
- Cobalt-germanium-tungsten alloy
- Intermetallic compounds
- Phase transformations
- Refractory metals