Abstract
Nanostructural features of nickel-base superalloys as revealed by atom probe field ion microscopy (APFIM) and atom probe tomography (APT) are reviewed. The more salient information provided by these techniques is discussed through an almost exhaustive analysis of literature over the last 30 years. Atom probe techniques are shown to be able to measure the composition of tiny γ′ precipitates, a few nanometers in size, and to reveal chemical order within these precipitates. Phase separation kinetics in model NiCrAl alloys was investigated with both 3DAP and Monte-Carlo simulation. Results are shown to be in good agreement. Plane by plane analysis of {001} planes of Ni3Al-type γ′ phase makes it possible to estimate the degree of order as well as the preferential sites of various addition elements (Ti, Cr, Co, W, Ta, Re, Ru, etc.) included in superalloys. Clustering effects of Re in the γ solid solution were also exhibited. Due to its ultrahigh depth resolution, the microchemistry of interfaces and grain boundaries can be characterized on an atomic scale. Grain boundaries in Astroloy or N18 superalloys were found to be enriched in B, Mo, and Cr and Al depleted.
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Dates
Type | When |
---|---|
Created | 17 years, 9 months ago (Nov. 15, 2007, 7:37 a.m.) |
Deposited | 2 years, 6 months ago (Feb. 14, 2023, 3:39 p.m.) |
Indexed | 3 weeks, 1 day ago (Aug. 3, 2025, 12:03 a.m.) |
Issued | 17 years, 9 months ago (Nov. 14, 2007) |
Published | 17 years, 9 months ago (Nov. 14, 2007) |
Published Online | 17 years, 9 months ago (Nov. 14, 2007) |
Published Print | 17 years, 8 months ago (Dec. 1, 2007) |
@article{Blavette_2007, title={Phase Transformation and Segregation to Lattice Defects in Ni-Base Superalloys}, volume={13}, ISSN={1435-8115}, url={http://dx.doi.org/10.1017/s143192760707078x}, DOI={10.1017/s143192760707078x}, number={6}, journal={Microscopy and Microanalysis}, publisher={Oxford University Press (OUP)}, author={Blavette, Didier and Cadel, Emmanuel and Pareige, Cristelle and Deconihout, Bernard and Caron, Pierre}, year={2007}, month=nov, pages={464–483} }