High Energy X-ray Diffraction Microscopy (HEDM) - Materials ...

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Near-field HEDM: Technique Summary • Non-destructive 3D crystallographic orientation field mapping • Ordered and deformed materials: metals, ceramics, … • Opportunity for basic and applied work (or “basic work on applied materials”) • Large data sets for computational model comparisons • Tracking of materials responses • Thermal / mechanical / radiation / … • APS Upgrade (aps.anl.gov/Upgrade) implications • 1-ID beamline on the “fast track” • Improved beam stability • Superconducting undulator source – 10X in brilliance! • New end-station hutch currently being instrumented • Second, fixed high energy, undulator beamline: a dedicated instrument??? • Easily combined with high energy tomography • Sample shape evolution • Crack / void formation and tracking • Easily (!) combined with far-field strain sensitive measurements
Near-field HEDM: Technique Summary • Compared to 3D EBSD • Higher orientation resolution • Lower spatial resolution • Faster: 3D volumes in < 24 hours (will accelerate) • But, you need a synchrotron – and not just any! • Compared to DAXM • Comparable orientation resolution • Lower spatial resolution / lower strain resolution • Faster per volume • Millimeter samples in transmission • Compared to DCT • Comparable resolutions • Slower • Access to deformed structures • Compared to tomography • Measures three parameter orientation field rather than scalar density field
Page 1 and 2: High Energy X-ray Diffraction Micro
Page 3 and 4: Outline 1. Synchrotron radiation so
Page 5 and 6: HEDM Common Feature: Bragg Scatteri
Page 8 and 9: Magnetic Lattices as Sources Wiggle
Page 10 and 11: Undulator X-ray Source
Page 12 and 13: Specialized beam line requirements
Page 14 and 15: June 2012: Commissioning of new cam
Page 16 and 17: Data Flow
Page 18 and 19: Geometry Determination 1. Center 30
Page 20 and 21: Near-field Reconstruction: High pur
Page 22 and 23: Technique Verification: HEDM & EBSD
Page 24 and 25: NIST Single Crystal (?) Ruby Sphere
Page 26 and 27: Simulation of a small grain with or
Page 28 and 29: w Lineshapes w = 93 94 95 96 97 98
Page 30 and 31: Reconstruction compared to broadene
Page 32 and 33: Reconstruction compared to broadene
Page 34 and 35: Simulation Validation
Page 36 and 37: Statistics extraction from large da
Page 38 and 39: Misorientation axes: Ni(Bi) Red lin
Page 42 and 43: Far-field measurements: Elastic Str

High Energy X-ray Diffraction Microscopy (HEDM) - Materials ...

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