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Imaging of grain-level orientation and strain in thicker metallic polycrystals by high energy transmission micro-beam Laue (HETL) diffraction techniques

DOI: 10.3139/146.110660 DOI Help

Authors: Felix Hofmann (University of Oxford) , Brian Abbey (Melbourne University, Australia) , Leigh Connor (Diamond Light Source) , Nikolaos Baimpas (University of Oxford) , Xu Song (University of Oxford) , Sinéad Keegan (School of Theoretical Physics, Dublin, Ireland) , Alexander M. Korsunsky (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: International Journal Of Materials Research (formerly Zeitschrift Fuer Metallkunde) , VOL 103 (2) , PAGES 192 - 199

State: Published (Approved)
Published: February 2012

Abstract: For high performance, safety-critical applications, such as aerospace components, in-depth understanding of the material\u2019s response to complex loading conditions is essential. Moreover, it is vital to know how the material behaviour may be modified as a consequence of fatigue loading and how its eventual failure occurs. Unlike bulk properties, such as stiffness, yield stress, etc. that depend on the average response of the grains in a polycrystal, material failure is determined by \u201cweakest link\u201d type mechanisms. These depend strongly on grain-level deformation behaviour and grain-to-grain interactions. Micro-beam Laue diffraction is a powerful tool to probe these phenomena. However, the classical setup is limited to the study of sample surface regions or thin sections, due to the limited penetration into the sample at photon energies of 5 \u2013 25 keV. A much more useful tool for the material scientist and engineer would allow the probing of grain-level orientation and stress in thicker sections of engineering components. To this end, we have developed the high energy transmission Laue (HETL) technique, an extension of the micro-beam Laue technique to significantly higher photon energies (50 \u2013 150 keV). For the imaging of lattice orientation and elastic strain in three dimensions, we propose two alternative approaches: Laue orientation tomography (LOT) and high energy differential aperture X-ray microscopy (HEDAXM). In this paper an overview of the recent progress in HETL, LOT and HEDAXM measurements will be given and some first results illustrating the potential of these techniques presented.

Subject Areas: Materials

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing