Defects and Interfaces: Their Role During Phase Transformations in Aluminium-Silver Alloys
thesisposted on 29.06.2018 by ZEZHONG ZHANG
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The story of metallurgy is a story of civilisation. Physical metallurgy concerns the fundamentals and applications of phase transformations: the process in which atoms arrange themselves from one structure to another. Al-Ag alloys have served as a textbook system for understanding the solid-state phase transformations. Using transmission electron microscopy and atomistic calculations, Zezhong found a new precipitate phase, zeta (AgAl), in this classical system. In-situ microscopy and electron tomography revealed phase transformations in time and space. Zezhong illustrated the importance of defects and interfaces, and how to use them to tailor the precipitation behaviour.