Functionally Graded Materials (FGMs) refer to materials with spatially varying properties through gradual changes in composition, and microstructure and properties. AM is well suited to produce FGMs owing to its two intrinsic features: the layer-upon-layer printing process, and the selective melting of spatial regions where the scanning strategies and printing parameters can be readily altered. AM of FGMs can create bimetallic joints and graded transitions have important commercial applications that can benefit from multi-material performance in some cases and cost savings in others. Additionally, FGMs fabricated by AM have been explored for high-throughput testing of material properties such as radiation damage in stainless steels [532], magnetic, electrical, and mechanical properties of Co-Fe-Ni alloys [533], and corrosion behavior of stainless steels [534].