Additive Friction Stir Deposition

Additive Friction Stir Deposition is a comprehensive summary of the state-of-the-art understanding on this emerging solid-state additive manufacturing technology. Sections cover additive friction stir deposition, encompassing advances in processing science, metallurgical science and innovative applications. The book presents a clear description of underlying physical phenomena, shows how the process determines the printing quality, covers resultant microstructure and properties in the as-printed state, highlights its key capabilities and limitations, and explores niche applications in repair, cladding and multi-material 3D printing.

Serving as an educational and research guide, this book aims to provide a holistic picture of additive friction stir deposition-based solid-state additive manufacturing as well as a thorough comparison to conventional beam-based metal additive manufacturing, such as powder bed fusion and directed energy deposition.

• Provides a clear process description of additive friction stir deposition and highlights key capabilities
• Summarizes the current research and application of additive friction stir deposition, including material flow, microstructure evolution, repair and dissimilar material cladding
• Discusses future applications and areas of research for this technology

Dr. Hang Z. Yu is an Associate Professor of Materials Science and Engineering at Virginia Tech. He received his bachelor’s degree in physics from Peking University in 2007 and his PhD degree in materials science and engineering from Massachusetts Institute of Technology in 2013. Prof. Yu is the recipient of DARPA (Defense Advanced Research Projects Agency) Young Faculty Award. At Virginia Tech, the primary interest of Prof. Yu’s research group lies in manufacturing science, with an emphasis on advanced materials processing and Industry 4.0. As a research pioneer of additive friction stir deposition, Prof. Yu is exploring multiple facets of the process, including integration of in situ monitoring and physics simulation for process control (temperature, force and torque, material flow, and distortion), design and synthesis of hybrid materials with innovative 3D internal structures, as well as use of the technology for structural repair, selective-area cladding, and materials recycling and upcycling.