Small angle neutron scattering (SANS) has been used to evaluate the temporal evolution of the secondary and tertiary γ precipitates in the nickel-base superalloy, RR1000, in situ during an aging heat treatment at 1033 K (760 °C) following a supersolvus heat treatment and oil quench. The bimodal distribution of secondary and tertiary γ was analyzed using a specially developed polydispersive model capable of evaluating the scattering curves to obtain precipitate size distributions (PSDs) and volume fractions as a function of time. The model was designed to be suitable for high volume fractions of γ and takes into account the scattering interaction between precipitates. The results show an increase in the volume fraction and the mean particle size of both the secondary γ and tertiary γ during aging. The initial and final precipitate distributions have been characterized using transmission electron microscopy (TEM) and show satisfactory correlation with the SANS data across the scattering vector range.
|Number of pages||11|
|Journal||Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science|
|Publication status||Published - Jan 2011|
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys