||Additive manufacturing (AM) is a disruptive technology, not only because it enables the production of components with complex geometries, but also because it provides unique opportunities for microstructure control and materials design. By contrast to conventional manufacturing technologies such as casting, forging, and hot rolling, AM offers additional degrees of freedom to “architect” materials microstructure across length scales. Both beam-based processes—such as power bed fusion (PBF) and directed energy deposition (DED)—as well as non-beam-based processes—such as cold spray, additive friction stir deposition, and ultrasonic additive manufacturing—unlock new opportunities for the control of microstructure and architecture for desired mechanical and functional properties. Understanding microstructure evolution and the resulting material’s behavior is key to developing novel material designs by AM methods. The goal of this focus issue is to highlight research on AM-produced microstructures and their impact on mechanical and physical properties of metallic materials. Both experimental and modeling submissions are encouraged, especially in which modeling or theory is applied and validated experimentally. Materials systems of interests include but not limited to structural materials, different types of steels, aluminum, titanium, nickel, copper, cobalt, refractory metals, shape-memory alloys, high entropy alloys, and bulk metallic glasses.
• Microstructural evolution during the AM process.
• Microstructure response of AM components to post-processing conditions.
• Simulation of microstructure stability and evolution during or post the AM process
• Novel alloy design tailored for AM.
• Architecture design in using AM methods.
• Microstructure and property relationship of the AM components.
• Artificial intelligence aided design for the microstructure or architecture optimization