Abstract
Transmission electron microscopy (TEM) and atom-probe tomography (APT) are employed to study the growth and coarsening kinetics of γ'-precipitates and the solute partitioning behavior in a series of model superalloys based on a Ni-8.5Cr-10Al at.% composition with Ru, Ru-Re, or Ru-Re-W additions, during isothermal aging at 800°C up to 256 h. Substituting Ru for Ni is found to retard the growth and coarsening kinetics of the γ'-precipitates; Re and W additions decrease the coarsening rate constant further by an order of magnitude. The exponent of the temporal power law for the precipitate radius is n= (3.3 ± 0.1) and the time exponent for the number density is m = (-0. 82 ± 0.06) for all three alloys, independent of coherency strain energy differences between the three alloys. The aluminum concentration in the γ'-precipitates is found to decrease continuously with aging time, which is consistent with a nucleation and growth precipitation process.
| Original language | English (US) |
|---|---|
| Pages | 309-314 |
| Number of pages | 6 |
| State | Published - Dec 1 2005 |
| Event | International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, United States Duration: May 29 2005 → Jun 3 2005 |
Other
| Other | International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 |
|---|---|
| Country/Territory | United States |
| City | Phoenix, AZ |
| Period | 5/29/05 → 6/3/05 |
Keywords
- Atom-probe tomography
- Coarsening
- Nickel-based superalloy
- Rhenium
- Ruthenium
- Transmission electron microscopy
- Tungsten
ASJC Scopus subject areas
- Engineering(all)