Abstract
This chapter provides an overview of the subject of this book, additive friction stir deposition. We begin by categorizing common additive manufacturing technologies and analyzing their feasibility for printing metals. We contrast solid-state additive technologies with conventional fusion-based approaches, such as powder bed fusion and directed energy deposition, while discussing their benefits and limitations. Within solid-state additive manufacturing technologies, we introduce the principle of additive friction stir deposition and compare its manufacturing capability with ultrasonic additive manufacturing and cold spray. A distinction is also drawn between additive friction stir deposition and friction stir additive manufacturing, which is a sheet lamination process. Finally, we discuss the organization of the book and provide a brief overview of the following chapters, which cover the process fundamentals, material flow, microstructure evolution, tooling, metal matrix composites, mechanical properties, niche applications, and future perspectives.
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