Abstract
Atom probe tomography was used to quantitatively assess grain boundary phase compositions and determine local segregation along the grain boundary before and after a 1000 h thermal exposure at 800 °C on an experimental powder processed Ni-base superalloy containing elevated levels of Nb. Due to high levels of refractory alloying elements at the grain boundary, a complex network of σ phase precipitates formed and the interfacial segregation profiles were studied. Although elemental B segregates to grain boundaries and secondary phase interfaces, insufficient levels are present to result in boride formation due to an enhanced solubility of B in the matrix phase.
Original language | English (US) |
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Pages (from-to) | 35-38 |
Number of pages | 4 |
Journal | Scripta Materialia |
Volume | 138 |
DOIs | |
State | Published - Sep 1 2017 |
Keywords
- Atom probe tomography
- Grain boundaries
- Precipitation
- Superalloy
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics