Abstract
Early-stage phase separation in a Ni-5.2 Al-14.2 Cr at.% superalloy, isothermally decomposing at 873 K, is investigated with atom-probe tomography. Sub-nanometer scale compositional profiles across the γ/γ'(L1 2) interfaces demonstrate that both the γ-matrix and the γ'-precipitate compositions evolve with time. Observed chemical gradients of Al depletion and Cr enrichment adjacent to the γ'-precipitates are transient, consistent with well-established model predictions for diffusion-limited growth, and mark the first detailed observation of this phenomenon. Furthermore, it is shown that Cr atoms are kinetically trapped in the growing precipitates.
Original language | English (US) |
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Pages | 543-548 |
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 |
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Country/Territory | United States |
City | Phoenix, AZ |
Period | 5/29/05 → 6/3/05 |
Keywords
- Diffusion-limited growth
- Interface composition
- Nanostructure
- Nickel alloys
ASJC Scopus subject areas
- Engineering(all)