SKM 2023 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Phase Transformations: Microstructural Transformations
MM 17.4: Vortrag
Dienstag, 28. März 2023, 11:00–11:15, SCH A 118
Bicontinuous microstructure formation through peritectic melting — •Zhongyang Li1, Nina Petersen1, Lukas Lührs1, and Jörg Weissmüller1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg — 2Institute of Materials Mechanics, Helmholtz-Zentrum Hereon, Geesthacht
Recent research has found that when heated above the peritectic line, the intermetallic compound TiAg decomposes into a separated solid Ti phase and a liquid Ag phase, thereby forming a bicontinuous microstructure. This shows that monolithic networks such as porous Titanium, which has potential application in the field of biomedicine, can be produced with simple heat treatment followed by selective removal of other phases. As a novel dealloying method for bulk materials, the underlying mechanism is still not completely understood. It is also unclear if this method could be used in different alloy systems.
In our research we find a similar microstructural phenomenon for CuSn alloys. With the help of electron microscopy and X-Ray diffraction, formation and evolution processes of the bicontinuous structure of both TiAg and CuSn systems are studied. Research on microstructure evolution can help both, setting up the criteria for searching new alloy systems and optimizing thermal treatment parameters. This enables us to further develop this method for porous metal preparation, and also broaden the application of this method from peritectic dealloying to dealloying at crystal-melt coexistence.