Additive Friction Stir Deposition

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.

"Prof. Hang Yu has created a masterpiece in this first book on the additive friction stir deposition technology. Additive friction stir deposition is emerging as a very high deposit rate additive manufacturing process and has started finding real world applications. This book provides a timely overview of this new field. As researchers and practitioners of this new technology work on various new opportunities, they will benefit from the necessary theoretical basis provided in Chapters 2, 3, 4 and 7. Prof. Yu draws from his own research and experience to provide insights. It is a very comprehensive book that covers from process physics and materials science to tooling/applications. This is a great resource for students who get in this field and is a "must read" book. Faculty teaching advanced manufacturing processes can use several chapters to teach about this disruptive manufacturing process." --Dr. Rajiv Mishra, University Distinguished Professor, University of North Texas, USA"A very timely book on this new emerging solid-state additive manufacturing technology. An excellent reference for those who are interested in 　this dynamic and fast growth topic, from fundamentals of the process, technology innovations, and resulting microstructure and properties." --Dr. Zhili Feng, Distinguished R&D Staff, and Leader Materials Joining Group, Oak Ridge National Laboratory, USA"Prof. Yu’s research has placed him and his team at the forefront of a technology that is seeing tremendous growth on the global additive manufacturing stage. This book expertly combines knowledge gained from years of experience into a single source that will offer the reader a keen insight into understanding the MELD process." --Dr. Chase Cox, Vice President, MELD Manufacturing Corporation, USA"A thorough book on the emerging additive friction stir deposition technology that is poised to be very disruptive to fusion-based additive manufacturing. It sufficiently covers the benefits and challenges of using the process and provides a solid foundation for further research." --Dr. Michael Eller, Adjunct Professor, University of New Orleans, USA

• 1. Introduction 2. Process Fundamentals3. Material Flow Phenomena4. Dynamic Microstructure Evolution5. Effects of Tool Geometry6. Beyond Metals and Alloys: Additive Friction Stir Deposition of Metal Matrix Composites7. Mechanical Properties of the Printed Materials8. Niche Applications9. Future Perspectives