Despite the importance in high-temperature processing, wettability studies focusing on liquid aluminum (Al) on solid nickel (Ni) at high temperatures are scarce due to the difficulty of performing experiments and the complexity of interfacial physical and chemical activities. The effects of interrelated multi-factors, including intermetallic compounds (IMCs) formation and diffusion on wetting dynamics is still debatable. Therefore, in this study, we investigated the reactive spreading of liquid Al on solid Ni by using the combined pendant/sessile drop method between 750 and 950 °C. The effects of Ni dissolution into Al on the spreading dynamics were limited due to the low Ni solubility below 950 °C. Two continuous Al-rich IMC layers, Al₃Ni and Al₃Ni₂ layers formed at the Al/Ni interface during the isothermal holding stage and affect the final wetting behavior. Additional capillary quenching experiments confirmed that the Al₃Ni phase was the first formed phase. At equilibrium, the Al₃Ni layer was pinned at the triple-phase line at 750 °C while it can spread ahead of the liquid front at higher temperatures. This process may be the main reason why at higher temperatures a better spreading is observed as the Al₃Ni layer has a larger affinity to Al than the pure Ni substrate.

尽管在高温加工中很重要，但由于难以进行实验以及界面物理和化学活动的复杂性，专注于高温下液态铝 (Al) 对固态镍 (Ni) 的润湿性研究很少。包括金属间化合物 (IMC) 形成和扩散在内的相互关联的多因素对润湿动力学的影响仍有争议。因此，在本研究中，我们使用悬滴/固滴组合法在 750 到 950 °C 之间研究了液态铝在固态镍上的反应扩散。由于低于 950°C 的镍溶解度低，镍溶解到铝中对扩散动力学的影响是有限的。两个连续的富铝 IMC 层，Al ₃ Ni 和 Al ₃ Ni ₂在等温保持阶段在 Al/Ni 界面形成的层会影响最终的润湿行为。额外的毛细管淬火实验证实，Al ₃ Ni 相是第一个形成的相。在平衡状态下，Al ₃ Ni 层在 750 °C 时被钉扎在三相线上，而它可以在较高温度下扩散到液体前沿。这个过程可能是为什么在更高的温度下观察到更好的扩散的主要原因，因为 Al ₃ Ni 层比纯 Ni 衬底对 Al 具有更大的亲和力。