Three-dimensional X-ray diffraction imaging of dislocations in polycrystalline metals under tensile loading

Mathew J. Cherukara (), Reeju Pokharel, Timothy S. O’Leary, J. Kevin Baldwin, Evan Maxey, Wonsuk Cha, Jorg Maser, Ross J. Harder, Saryu J. Fensin () and Richard L. Sandberg ()
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Mathew J. Cherukara: Argonne National Laboratory
Reeju Pokharel: Los Alamos National Laboratory
Timothy S. O’Leary: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
J. Kevin Baldwin: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
Evan Maxey: Argonne National Laboratory
Wonsuk Cha: Argonne National Laboratory
Jorg Maser: Argonne National Laboratory
Ross J. Harder: Argonne National Laboratory
Saryu J. Fensin: Los Alamos National Laboratory
Richard L. Sandberg: Center for Integrated Nanotechnologies, Los Alamos National Laboratory

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract The nucleation and propagation of dislocations is an ubiquitous process that accompanies the plastic deformation of materials. Consequently, following the first visualization of dislocations over 50 years ago with the advent of the first transmission electron microscopes, significant effort has been invested in tailoring material response through defect engineering and control. To accomplish this more effectively, the ability to identify and characterize defect structure and strain following external stimulus is vital. Here, using X-ray Bragg coherent diffraction imaging, we describe the first direct 3D X-ray imaging of the strain field surrounding a line defect within a grain of free-standing nanocrystalline material following tensile loading. By integrating the observed 3D structure into an atomistic model, we show that the measured strain field corresponds to a screw dislocation.

Date: 2018
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DOI: 10.1038/s41467-018-06166-5

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