Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session 2
MM 18.10: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Dealloying and nanoscale structure formation at crystal-melt coexistence — •Zhongyang Li1, Nina Petersen1, Lukas Lührs1, and Jörg Weissmüller1,2 — 1Institute of Materials Physics and Technology, Hamburg University of Technology — 2Institute of Materials Mechanics, Hybrid Materials Systems, Helmholtz-Zentrum Hereon
Recent work on Ti-Ag alloy has shown that a bicontinuous microstructure can be formed via peritectic melting, which could further transform to open porous Ti or Ag networks through selective etching. Several factors including the large solubility difference of two alloy elements in liquid phase, large composition difference and the volume fraction of the solid and liquid phases are considered to be criteria for this phenomenon. However, the formation mechanism of this particular microstructure during peritectic dealloying is still not fully known.
In this work, alloy systems including Bi-Ni, Fe-Sn and Mn-Sn, are chosen, which satisfy part or all of the aforementioned criteria. With SEM and diffraction experiments of these samples after peritectic melting, we investigate the morphology of different phases, and discuss the dominant factor for the formation of bicontinuous structure. The effect of parameters for thermal treatment, including temperature and duration of heat treatment, are also studied using SEM, in order to find the optimized combination that could produce finer microstructure. With the research in these two aspects, we discuss the possibility of broadening the application of this new dealloying method from peritectic dealloying to dealloying at liquid-solid coexistence state.