About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-Grained and Heterostructured Materials (UFGH) XIV
|
| Presentation Title |
Lattice-Defect Induced Thermal Behavior of Ultrafine-Grained Copper Examined by Synchrotron X-ray Diffraction |
| Author(s) |
Isshu Lee, Laxman Bhatta, Klaus-Dieter Liss, Megumi Kawasaki |
| On-Site Speaker (Planned) |
Megumi Kawasaki |
| Abstract Scope |
Ultrafine-grained (UFG) metals produced by severe plastic deformation are well recognized in the materials community for their exceptional mechanical and functional properties. However, their microstructural evolution and property changes with temperature and time remain areas of active investigation. In this study, two complementary micro-beam synchrotron X-ray diffraction techniques are employed to analyze the microstructural relaxation of bulk nanostructured copper produced by high-pressure torsion during heating. The monochromatic X-ray beam enables the measurement of changes in lattice parameters associated with linear thermal expansion, as well as the evaluation of microstructural features such as micro-strain, crystallite size, and texture. These data enable the estimation of stored strain energy and its role in driving microstructural recrystallization. In contrast, the white-beam X-ray technique allows direct observation of grain reorientation and grain coarsening during thermal relaxation. Combining these methods deepens understanding of defect-driven changes, enhancing control of thermal microstructure evolution in UFG metals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Copper / Nickel / Cobalt, Shaping and Forming, Mechanical Properties |