Abstract Deep understanding of dealloying mechanisms is of central importance to investigate the formation of nanoporous structure, but normally lacks of in-situ information. Herein, the dealloying of a rapidly solidified two-phase Al80Ag20 precursor was detailedly investigated using in-situ X-ray diffraction. Both the solution type and dealloying duration were taken into consideration, and some new dealloying scenarios were identified. It has been found that no intermediate phase appears during the dealloying of Al80Ag20 in both the NaOH and HCl solutions. The α-Al(Ag) and Ag2Al phases in Al80Ag20 show sequential dealloying in the HCl solution. Moreover, the influence of the formed Ag and the size effect of Ag2Al jointly contribute to the complete dealloying of Ag2Al in the HCl solution, despite its inert nature in NaOH. These findings could give insights into the dealloying process and provide valuable information on tuning microstructures/properties of nanoporous metals.

中文翻译：

---

利用原位 X 射线衍射研究快速凝固 Al80Ag20 合金的脱合金机制

摘要 深入了解脱合金机制对于研究纳米多孔结构的形成至关重要，但通常缺乏原位信息。在此，使用原位 X 射线衍射详细研究了快速凝固的两相 Al80Ag20 前体的脱合金。解决方案类型和脱合金持续时间都被考虑在内，并确定了一些新的脱合金场景。已经发现在 NaOH 和 HCl 溶液中对 Al80Ag20 进行脱合金过程中没有中间相出现。Al80Ag20 中的 α-Al(Ag) 和 Ag2Al 相在 HCl 溶液中显示出连续的脱合金。此外，尽管 Ag2Al 在 NaOH 中呈惰性，但形成的 Ag 的影响和 Ag2Al 的尺寸效应共同促成了 Ag2Al 在 HCl 溶液中的完全脱合金。