Abstract:In the additive manufacturing process, there are melt-solidification defects in the processed components using electron beam or laser powder melting technology. The additive friction stir deposition (AFSD) based on solid-phase additive technology overcomes such defects and has been applied. During the additive process of AFSD, material melting and solidification are not involved. The deposited components with high material density and small grains have a uniform, equiaxed, and fine microstructures. Consequently, they possess good toughness and mechanical properties that can reach the forging level. Although there have been some studies on AFSD for materials such as aluminum alloy, magnesium alloy, and titanium alloy, this process is still in the early stage. Therefore, the research and application of AFSD in the recent 20 years were reviewed, which was elaborated from aspects such as principles, equipment, processes, properties, applications, and development trends, providing a reference for the research of AFSD.