| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Heterostructured and Gradient Materials (HGM VI): Principle, Processing and Properties
|
| Presentation Title |
Characterization of Heterostructure in Bulk Nanostructured Metals Processed by High-Pressure Torsion |
| Author(s) |
Megumi Kawasaki, Roberto B. Figueiredo, Klaus-Dieter Liss |
| On-Site Speaker (Planned) |
Megumi Kawasaki |
| Abstract Scope |
Severe nanostructuring of metals and materials through high-pressure torsion (HPT) processing can produce bulk nanostructured materials with minimal saturated nano-scale grains. This study emphasizes various characterization techniques used to identify the heterostructure within bulk nanostructured metals across multiple length scales. Specifically, it demonstrates heterostructure resulting from inhomogeneous HPT shear flow in (i) nanostructured TiAl intermetallic compounds analyzed using lab-scale X-ray diffraction, and (ii) nickel-based superalloy and HPT-bonded Al-Mg alloy analyzed using high-energy synchrotron X-ray diffraction. This heterogeneity affects the microstructural recovery in nanostructured CoCrFeNiMn alloy, as observed in situ during heating with high-temperature laser-scanning confocal microscopy. The finite element method (FEM) is used to calculate the distribution of plastic strain and flow stress during HPT for various sample dimensions. The results indicate that by adjusting the sample dimensions, and consequently the friction conditions, the creation and elimination of heterostructures under HPT can be effectively controlled. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Shaping and Forming |