K.F. Russell

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The role of copper in the embrittlement of A533B and related steels used as the pressure vessels of nuclear reactors has been the subject of numerous atom probe investigations. As copper is deleterious to the mechanical properties of these neutron irradiated steels, some copper-free and low copper alloys have been investigated with the local electrode atom(More)
Several methods have been developed to fabricate atom probe specimens from different forms of materials, including thin ribbons, mechanically ground sheet and fine powders. In addition, FIB-based methods can be used in conjunction with electropolishing methods to improve the shape, surface finish and taper angle of specimens. Several lift-out (LO) methods(More)
In this paper, local electrode atom probe is used to characterize the differences in interfacial partitioning that occurs between the TCP, gamma and gammasquare phases in single-crystal Ru-bearing Ni-based superalloys. Identification of the compositional variations in the topologically-close-packed (TCP) phases is also presented
A new higher chromium variant of mechanically alloyed (MA) oxide dispersion strengthened (ODS) ferritic alloy, designated 14YWT, has been developed. The microstructures of this alloy have been characterized in the local electrode atom probe from the initial ball milled flakes through the extruded material that was heat treated at up to 1380degC. No(More)
A failure analysis of local electrodes has been performed with the use of a dual beam ion miller/scanning electron microscope. Each aperture was examined before and after use in the local electrode atom probe. In addition, many atom probe specimens were characterized after the experiment to correlate the condition of the specimen with that of the aperture.(More)
The results of a series of different methods for estimating the solute concentration of copper-enriched precipitates and the solute segregation at dislocation in welds from the Midland and Palisades reactors were presented. These welds have been neutron irradiated to fluences of up to 3.4 times 10<sup>23</sup> n m<sup>-2</sup> (E &gt; 1 MeV) at a(More)
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