| Abstract Scope |
Prof. Terence G. Langdon has made pioneering contributions to the understanding of flow behavior and forming processes in nanocrystalline materials. Nanostructuring metals through severe plastic deformation can produce bulk nanocrystalline metals with enhanced mechanical properties and unexpected functionality. This presentation highlights the importance of diffraction methods in characterizing nanostructures, particularly those with metastable and heterogeneous compositions, and also exhibiting non-linear and non-monotonic microstructural recovery during heating. High-energy synchrotron X-rays were instrumental in revealing the formation of metastable nanostructures in an Al-Mg alloy, which resulted from the solid-state bonding to further mixing and eventual alloying of dissimilar metals through high-pressure torsion processing. Additionally, in situ heating diffraction techniques uncovered a complex evolution in nanostructured Cu and Mg alloys, including recovery, recrystallization, phase transformations, and grain growth. These advanced diffraction analyses enhance our understanding of the processing-microstructure relationship in nanocrystalline metals. |