Interfaces in Oxides Formed on NiAlCr Doped with Y, Hf, Ti, and B 399


Figure 3. Atom probe tomography of a YHf-sample, prepared at the outermost part of the oxide. In the heat maps red indicates a high, and blue a low concentration. A protective Au-coating is still present on top of the oxide. The Hf at the top is incorrectly assigned Pt. Ni-spinel can be identified by observing the Ni concentration. One can see enrich- ment of Y and Hf at most oxide grain boundaries (GBs) and phase boundaries (PBs). In the spinel-GBs Al is enriched.


Figure 4. a: Several regions identified in the Ni-rich part of the YHf-sample presented in Figure 3. b: Magnification of the upper region containing Ni-rich particles. c: A proxigram of the major elements through the 32at% Ni isosurface of the marked (red arrow) particle. Note the low O-concentration in the particle core. d: Same as for (c) but for the minor elements. Carbon is enriched in the particle in comparison with the surrounding material. Cr and Hf are depleted in the particle core. e: A closer look at region 3b with a green isosurface for Ni >10 at% and the pink isosurface for Cr >7 at%. f: The proxigram of the marked [arrow in (e)] Cr particle reveals that the precipitate follows the M2O3 composition.


different grains with this composition.One, going vertically, is heavily enriched in Hf, Y, and Al, with Gibbsian excesses of ΓHf=1.6nm−2, ΓCr=1.5nm−2, ΓY=0.1nm−2, ΓAl=1.3nm−2,


and ΓO=2.8nm−2 (Table 2). Two other GBs, which are oriented at an angle of 60° to the vertical one, are parallel to each other and seem to contain less Hf , almost no Y, but do


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