Metal additive manufacturing (AM) has evolved from a rapid prototyping tool into a manufacturing technology capable of producing complex high-performance components for aerospace, energy, biomedical and structural applications. Despite significant progress, widespread industrial adoption remains limited by challenges related to process stability, microstructure control, defect formation, mechanical performance and qualification. At the same time, metal AM is emerging as a transformative manufacturing route, that enables unique microstructures and combinations of properties that are difficult or even impossible to achieve through conventional processing. This symposium emphasizes materials-centric research aimed at understanding and controlling microstructure, defects and mechanical performance in metal AM. It will highlight advances in process–structure–property relationships that support robust, repeatable and high-performance AM components, addressing both fundamental mechanisms and emerging processing concepts. The symposium covers, but is not limited to, contributions addressing the following topics:

•  Metal AM processes and underlying process physics including laser and electron beam powder bed fusion, directed energy deposition and hybrid manufacturing routes.
• Process–microstructure relationships governing melt pool behavior, solidification, phase transformations, beam shaping and residual stresses.
• Alloy and microstructure design strategies for AM including multimaterials and functionally graded materials.
• Defect formation and degradation mechanisms and their impact on mechanical and functional performance.
• Mechanical behavior of AM metals including fatigue, fracture and creep.
• Post-processing, in situ monitoring and data-driven approaches for process control, qualification and certification.