In situ nanobeam electron diffraction strain mapping of planar slip in stainless steel

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Abstract

Nanobeam electron diffraction strain mapping has been used to measure the strain evolution in stainless steel under in situ deformation. As the amount of deformation increases, the leading dislocation of a planar slip band leaves behind a residual strain in the form of a small lattice expansion. Dislocation analysis confirmed that the dislocations involved were <011 > type. While the characteristic residual strain of planar slip has often been observed, it has never before been directly measured. Our results provide a view into the dynamic mechanisms of planar slip, and showcase the possibilities of multidimensional in situ imaging.

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Pekin, T. C., Gammer, C., Ciston, J., Ophus, C., & Minor, A. M. (2018). In situ nanobeam electron diffraction strain mapping of planar slip in stainless steel. Scripta Materialia, 146, 87–90. https://doi.org/10.1016/j.scriptamat.2017.11.005

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