| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Heterostructured and Gradient Materials (HGM VI): Principle, Processing and Properties
|
| Presentation Title |
High-Energy Synchrotron X-Ray Diffraction to Characterize Gradient Nanocrystalline Structure in High-Pressure Torsion Processed Inconel 718 |
| Author(s) |
Laxman Bhatta, Isshu Lee, Klaus-Dieter Liss, Megumi Kawasaki |
| On-Site Speaker (Planned) |
Laxman Bhatta |
| Abstract Scope |
This study examines the gradient nanostructure of Inconel 718 subjected to high-pressure torsion (HPT), where the introduced shear strain is axial symmetric within the disk sample. High-energy synchrotron X-ray micro-beam diffraction analysis was performed on a 10 mm diameter disk at 50 distinct locations along the diameter to comprehensively map the spatial distribution of gradient microstructural features. The resulting diffraction data were analyzed for intensity, full width at half maximum (FWHM), and residual strain, producing unique diffraction mosaics of the data for the representative FCC peaks. The local intensity variation with the azimuthal direction reveals the anisotropic property, the FWHM variation provides insights into the crystallite size and microstrain, and the residual strain variation highlights areas of concentrated internal stress. A Williamson-Hall analysis shows location-dependent variations and anisotropy in crystallite size, microstrain, and dislocation density. The diffraction study provides a detailed correlation between the processing-microstructure relationship of the nanostructured alloy. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Computational Materials Science & Engineering, Nuclear Materials |