What is it about?
Three case studies were reported, which demonstrate the application of electron backscatter diffraction technique in order to clear up the nature and main patterns of structural transformations at large plastic strains. The cases considered relate to the microstructure evolution in aluminum under extremely high strain rates as well as the formation of deformation- induced boundaries in iron under necking. Based on the crystallographic analysis of deformation structure, it has been shown that deformation twinning occurs in aluminum in the form of mesoscale bands. Such twins make significant contribution to the structure formation when processing aluminum by dynamic channel angular pressing and when bonding aluminum plates by explosive welding. The analysis of angular deviations from the ideal twin misorientation allows evaluating, at which stage of deformation the twins had been nucleated. The study of structure evolution inside the neck of iron tensile specimen showed that deformation-induced high-angle boundaries, which serve as the preferential sites for the void nucleation, appear at a true strain about 1, mainly through formation of shear microbands.
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Why is it important?
The transmission electron microscopy, no doubt, provides the best resolution and allow discovering and characterizing the smallest structural defects. However, its high locality at the same time restricts its ability. In contrast, EBSD technique turns out to be indispensable when more panoramic representation of the deformation structures is essential.
Perspectives
Writing this article was a great pleasure as it has co-authors with whom I have had long standing collaborations. This article also lead to rare disease groups contacting me and ultimately to a greater involvement in rare disease research.
Elina Ushanova
Read the Original
This page is a summary of: EBSD analysis application to study evolution of deformation structures in materials science, January 2023, American Institute of Physics,
DOI: 10.1063/5.0143481.
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