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A study of Ni-based refractory alloys via anomalous scattering techniques
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of data scaling process for radial distribution analysis. Data in arbitrary units (a) are scaled to electron units by oscillation about coherent and incoherent scattering (b) to result in (c) (see Ref. 14).

Image of FIG. 2.
FIG. 2.

Radial distribution function (RDF) for RAG4 sample. is also included for comparison. Note the presence of first four nearest neighbor shells.

Image of FIG. 3.
FIG. 3.

Anomalous dispersion correction factors for (a) Ni edge at and (b) Nb edge at .

Image of FIG. 4.
FIG. 4.

Monochromator scans across Ni absorption edge. The black arrow corresponds to the point of inflection of .

Image of FIG. 5.
FIG. 5.

Individual synchrotron scattering patterns taken for an individual RAG3 sample.

Image of FIG. 6.
FIG. 6.

Raw scattering data comparisons of a RAG3 sample near Ni edge. Note differences in uncorrected intensities at various scattering vector, , values.

Image of FIG. 7.
FIG. 7.

DDF comparisons for RAG3 .

Image of FIG. 8.
FIG. 8.

Differential RDF plot for a typical RAG3 sample extrapolated to .

Image of FIG. 9.
FIG. 9.

(Color) bcc-like model for cluster arrangement of RAG3 alloy consisting of Ni-rich (blue spheres) and Nb-rich clusters. Beginning with distinct clusters of radii (a), this model is slightly perturbed to reveal variations from this distance (b). Finally, the abrupt transition from a Ni-rich region to a Nb-rich region is softened to reveal nondistinct edges to these clusters in (c).

Image of FIG. 10.
FIG. 10.

In situ x-ray scans with heating of RAG3 at (scan time ).

Image of FIG. 11.
FIG. 11.

[(a) and (b)] SEM images of polished surface. Note raised features of micron dimensions.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A study of Ni-based refractory alloys via anomalous scattering techniques