Powder metallurgy is one way to form finished or semi-finished products. It is most suitable for complex shapes that are not economical to produce from billet, forgings, or castings, for whatever reason. Due to the presence of myriad crack origin sites that are generally present in a powdered metal product, the full yield strength of the native material tends to be unrealized. IMO, powder metallurgy would be a poor way to manufacture spokes, and I doubt that it is practiced.