Abstract Scope |
Metal powder-based additive manufacturing (AM) techniques often rely on traditional alloys to create a processed part. However, processing and performance capabilities are not optimized with these traditional powders, prompting a need for designer feedstock material. Considering variations in powder morphology and composition, research was conducted to compare both traditional and designer feedstock powders for AM applications. Ideal feedstock powder for AM can be characterized by narrow particle size-shape distributions, as well as superior powder properties. Powder properties are directly connected to internal microstructure; thus, a precisely controlled microstructure is necessary for optimal powder performance. A powder's microstructure can be manipulated by thermal treatments, therefore both heat-treated and as-received powders were evaluated. Powder morphology was characterized using a synchronous laser diffraction and dynamic image particle analyzer, and the microstructure was analyzed using scanning electron microscopy, energy dispersive x-ray spectroscopy, and nanoindentation. Analysis was guided through computational thermodynamic and kinetic models. |