Adhesion and nonwetting-wetting transition in the Al/alpha-Al_2O_3 interface
Qing Zhang, Tahir Çağın, Adri C. T. van Duin, William A. Goddard III, Yue Qi, Louis G., Jr. Hector
Abstract
Using a reactive force field (ReaxFF), we investigated the structural, energetic, and adhesion properties, of both solid and liquid Al/alpha-Al2O3 interfaces. The ReaxFF was developed solely with ab initio calculations on various phases of Al and Al2O3 and Al-O-H clusters. Our computed lattice constants, elastic constants, surface energies, and calculated work of separation for the solid-solid interface agree well with earlier first-principles calculations and experiments. For the liquid-solid system, we also investigated the nonwetting-wetting transition of liquid Al on alpha-Al2O3(0001). Our results revealed that the evaporation of Al atoms and diffusion of O atoms in alpha-Al2O3 lead to the wetting of liquid Al on the oxide surface. The driving force for this process is a decrease in interfacial energy. The nonwetting-wetting transition was found to lie in the 1000–1100 K range, which is in good agreement with sessile drop experiments.
Group Members
Zhang, Q., Çağın, T., Duin, A. C. T. v., III, W. A. G., Qi, Y., & Hector, L. G. J. (2004). Adhesion and nonwetting-wetting transition in the Al/alpha-Al_2O_3 interface. *Phys. Rev. B*, *69*(4), Art. No. 045423. https://doi.org/10.1103/PhysRevB.69.045423