Wetting and spreading of NiCrFeSiB on iron-based alloy substrate at different temperatures: A molecular dynamics study

Abstract

In this study, the molecular dynamics modeling method was used to investigate the wetting and spreading behavior of Ni-based high-temperature brazing alloy (NiCrFeSiB) on iron substrate. The modeling results reveal that the wetting and spreading morphology of the molten droplet on the substrate surface varies significantly with temperature and diffusion time. The spreading behavior of the droplet is closely related to both temperature and time, with the spreading velocity increasing as the temperature rises. The droplet spreading process can be divided into two distinct stages: rapid spreading and slow spreading. Notably, significant atomic interdiffusion is observed near the solid–liquid contact region. Furthermore, the diffusion capabilities of different elements vary considerably, a phenomenon closely associated with the interactions between atoms.