No, pores cannot reduce the ductility of a metal. The decrease in plasticity is not associated with porosity, but with the presence of non-metallic inclusions (oxides and nitrides), which in most cases are present in materials manufactured using 3D printing technologies.
Yes, sure. Technologies of additively manufactured metals has varying success and complexity for different alloys. For example, for metals and alloys with high chemical activity and affinity for oxygen (aluminum, titanium, magnesium, zirconium, etc.), the production of products using these technologies is much more difficult than for metals with lower chemical activity (iron, copper, nickel, cobalt, molybdenum, etc.).
There are other features of 3D printing technologies for different alloys, for example, associated with subsequent heat treatment (porosity elimination by hot isostatic pressing, hardening, tempering, dispersion strengthening, normalization, etc.).
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