Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7969116 | Materials Characterization | 2018 | 12 Pages |
Abstract
Because they exhibit very similar diffraction patterns, the γ and γⲠphases of nickel-based superalloys cannot be distinguished by the conventional EBSD technique alone. This paper presents an original method which discriminates those phases on an orientation map by exploiting their chemical differences. Performed with a Focused Ion Beam (FIB) microscope, the method is the combination of the ion CHanneling ORientation Determination technique (iCHORD) - recently developed by Langlois et al. [1] - with the chemical information obtained from Secondary Ion (SI) images. The performances of the method are compared to the EDS-EBSD coupling which also discriminates phases based on their chemical compositions. Applied filters, angular resolution, spatial resolution of the phase discrimination and acquisition time are discussed. It results that the iCHORD-SI combination offers an orientation map with an angular resolution slightly decreased compared to that of the EBSD technique, but with a good phase resolution (down to 150â¯nm) and within a reasonable acquisition time. Thus, the iCHORD-SI combination appears to be an interesting method for the crystallographic systems where phases are difficult to discriminate by the EBSD technique alone but present a significant chemical contrast.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Suzanne Vernier, Jean-Michel Franchet, Maxime Lesne, Thierry Douillard, Jérémie Silvent, Cyril Langlois, Nathalie Bozzolo,