Premium
Strain resolution of scanning electron microscopy based Kossel microdiffraction
Author(s) -
Bouscaud D.,
Morawiec A.,
Pesci R.,
Berveiller S.,
Patoor E.
Publication year - 2014
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576714019402
Subject(s) - materials science , superalloy , diffraction , resolution (logic) , synchrotron , scanning electron microscope , strain (injury) , stress (linguistics) , crystallography , alloy , optics , composite material , chemistry , physics , computer science , medicine , linguistics , philosophy , artificial intelligence
Kossel microdiffraction in a scanning electron microscope enables determination of local elastic strains. With Kossel patterns recorded by a CCD camera and some automation of the strain determination process, this technique may become a convenient tool for analysis of strains. As for all strain determination methods, critical for the applicability of the Kossel technique is its strain resolution. The resolution was estimated in a number of ways: from the simplest tests based on simulated patterns (of an Ni alloy), through analysis of sharp experimental patterns of Ge, to estimates obtained by in situ tensile straining of single crystals of the Ni‐based superalloy. In the latter case, the results were compared with those of conventional X‐ray diffraction and synchrotron‐based Kossel diffraction. In the case of high‐quality Ge patterns, a resolution of 1 × 10 −4 was reached for all strain tensor components; this corresponds to a stress of about 10 MPa. With relatively diffuse patterns from the strained Ni‐based superalloy, under the assumption of plane stress, the strain and stress resolutions were 3 × 10 −4 and 60 MPa, respectively. Experimental and computational conditions for achieving these resolutions are described. The study shows potential perspectives and limits of the applicability of semiautomatic Kossel microdiffraction as a method of local strain determination.