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A High Energy Microscope for Local Strain Measurements Within Bulk Materials
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2000
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EngineeringMicroscopyMechanical EngineeringX-ray ImagingStructural MaterialsStressstrain AnalysisMicrostructure-strength RelationshipNovel Diffraction TechniqueRadiation ImagingHigh Energy MicroscopeHealth SciencesMaterials ScienceStrain LocalizationMicroanalysisSolid MechanicsMicrostructureScanning Probe MicroscopyMaterials CharacterizationApplied PhysicsScanning Force MicroscopyId11 BeamlineSteep Macrostrain GradientsMechanics Of MaterialsHigh Strain Rate
A novel diffraction technique for local, three dimensional strain scanning within bulk materials is presented. The technique utilizes high energy, micro-focussed synchrotron radiation which can penetrate several millimeters into typical metals. The spatial resolution can be as narrow as 1 μm in one dimension and in three dimensions about 5×10×100 μm 3 . Bulk properties are probed non-destructively and in-situ measurements during thermo-mechanical processing are feasible. A dedicated experimental station has been constructed at the ID11 beamline of the European Synchrotron Radiation Facility. Case studies demonstrate that steep macrostrain gradients can be resolved. Techniques for the local measurement of macro- and microstrains are discussed.