A5073989424- Electron and X-Ray Spectroscopy Techniques
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Nuclear Physics and Applications
- Advanced X-ray and CT Imaging
- Nuts composition and effects
- Additive Manufacturing Materials and Processes
- Integrated Circuits and Semiconductor Failure Analysis
- Hydrogen embrittlement and corrosion behaviors in metals
- Shape Memory Alloy Transformations
- Advancements in Battery Materials
- Railway Engineering and Dynamics
- Microstructure and Mechanical Properties of Steels
- Laser Material Processing Techniques
- Microstructure and mechanical properties
- Welding Techniques and Residual Stresses
- Conservation Techniques and Studies
- Cultural Heritage Materials Analysis
- Advanced machining processes and optimization
- Cellular and Composite Structures
- Thermography and Photoacoustic Techniques
- Advanced Surface Polishing Techniques
Saarland University
2018-2024
Fraunhofer Institute for Nondestructive Testing
2021
Correlative microscopy approaches are attracting considerable interest in several research fields such as materials and battery research. Recent developments regarding X-ray computer tomography have made this technique available a compact module for scanning electron microscopes (SEMs). Nano-computed (nanoCT) allows morphological analysis of samples nondestructive way to generate 2D 3D overviews. However, alone is not sufficient advanced studies, draw conclusions beyond morphology, chemical...
This study focuses on the influence of additive manufacturing process strategies specimen geometry, porosity, microstructure and mechanical properties as well their impacts design metamaterials. Filigree additively manufactured NiTi specimens with diameters between 180 350 µm a nominal composition Ni50.9Ti49.1 (at %) were processed by laser powder bed fusion in first step. Secondly, they structures characterized optical electron microscopy micro tomography to investigate interrelations...
Laser cutting is a suitable manufacturing method for generating complex geometries sheet metal components. However, their cyclic load capacity reduced compared to, example, milled This due to the influence of laser-cut edge, whose characteristic features act as crack initiation sites, especially resolidified material in form burr and melt droplets. Since components are often formed into final geometry after cutting, another important factor influencing fatigue behavior effect forming process...
Scanning electron microscopy (SEM) is a powerful and versatile technique for materials characterization present in many laboratories. The integration of an X-ray target holder detector allows expanding the modalities SEM by imaging. These little hardware adaptations enable radiography or computed tomography (CT) to gain three-dimensional (3D) information about sample be investigated. Since SEM-based CT non-destructive technique, method can also image time-dependent changes microstructure....
Non-destructive testing of objects and structures is a valuable tool, especially in cultural heritage where the preservation inspected sample vital importance. In this paper, decorative marquetry with three non-destructive (NDT) techniques: air-coupled ultrasound, X-ray micro-tomography, infrared thermography. Results from techniques were compared discussed. micro-tomography presented most detailed results. On other hand, thermography provided interesting results advantage being cheap easy...
Abstract Chip formation is considered one important indicator to evaluate machining processes. In particular, geometric features of chips may provide insights for the assessment stability and productivity. fixed-abrasive processes, such as grinding honing, are simultaneously produced by many geometrically undefined cutting edges. Despite being “undefined,” abrasive grains can still be statistically characterized or described. Accordingly, it assumed that, under stable conditions, also...
Precipitation is one of the most important influences on microstructural evolution during thermomechanical processing (TMCP) micro-alloyed steels. Due to precipitation, pinning prior austenite grain (PAG) boundaries can occur. To understand mechanisms in detail and relation treatment, a local characterization precipitation state depending microstructure essential. Commonly used methods for characterization, such as transmission electron microscopy (TEM) or matrix dissolution techniques, only...
Aluminium alloys with silicon as their major alloying element are widely used in die or sand casting of machine vehicle parts. The microstructure hypereutectic Al-Si (>12% Si) consist primary particles and the eutectic. Elements such Cu, Mg Ni added order to form a great variety different intermetallic phases which improve mechanical properties at elevated temperatures. Size, shape connectivity these complexly formed play decisive role for that reason interest. As complex shapes not...
Besides electron imaging in Scanning Electron Microscopy (SEM), techniques like Energy Dispersive X-ray spectroscopy (EDX) or Backscatter Diffraction (EBSD) are widely established. With integration of a target holder and pixelated x-ray detector, Computed Tomography (CT) SEM can be realized extends the modalities materials characterization one instrument. For nano-CT mode, an beam is focused on suitable leading to emission. While passing through specimen, x-rays differently attenuated...
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Nano-computed tomography (nano-CT) based on scanning electron microscopy (SEM) is utilized for multimodal material characterization in one instrument. Since SEM-based CT uses geometrical magnification, X-ray targets can be adapted without any further changes to the system. This allows designing with varying geometry and chemical composition influence focal spot, intensity energy distribution aim enhance image quality. In this paper, three different target geometries a volume are presented:...