Ferrous materials are quite obviously all compositions where Fe is the main chemical constituent, and the main phase in the material is one of the phases possible for metallic Fe. These materials can be produced by Press&Sinter, MIM, HIP, AM, and other shaping techniques.
Non ferrous materials
These materials may contain Fe but not as main constituent. Among common families we can list Al alloys, Co alloys, Ni alloys, Cu alloys, Ti alloys, Zr alloys, Mg alloys, Mo alloys, W alloys. It might include also materials that are clearly non-metallic, but those would normally be best classified in other categories like hard materials, functional materials or high temperature materials.
Materials whose density is below that of steels are normally considered “light”: that includes in particular Al alloys, Mg alloys, and also Ti alloys, and others. Outside metallic compositions, intermetallics (from the Fe-Al or Ni-Al systems, with additions, or others) could be included in this subtopic. Ceramic additions are also usually decreasing the overall density, so metal matrix composites could be included here if the goal is a lower density.
High temperature materials
Although being a part of Functional Materials, these are a well-established family of alloys that find application in high temperature-intensive applications like aerospace and energy, but also automotive and others. Typically, these include Ni alloys, Oxide Dispersed Steels (ODS), refractory metals, high entropy alloys, ceramics and ceramic composites, and other high temperature resistant materials.
Functional materials mostly make use of a distinct physical property they bring into a component, such as magnetism, caloric effects, electronic conductivity, and others. They may also enable manufacturing processes in the form of temporary agents, due to chemical, rheological or other physical behaviours. As a non-exhaustive list, Functional Materials include electrical and electronic materials, multiscaled and functionally graded materials, shape memory alloys, temperature management materials, PM magnetic materials (hard magnetic materials, soft magnetic materials, special soft magnetic composites), porous materials (cellular materials, filters, metal foams).
Hard metals and cermets
WC based hardmetals, Ti(C,N) based cermets; PM Tool Steels, Consolidation (including AM and MIM), Processing and Finishing Technologies, Raw Materials, Powders and Binders. Surface Modification Technologies including Coating. Modelling and Simulation, Chemical and Mechanical Post Processing.
Engineering ceramics, Superhard CBN and PCD and monocrystalline diamond impregnated tools, Diamond Tools. Consolidation (including AM and MIM), Processing and Finishing Technologies, Raw Materials, Powders and Binders. Surface Modification Technologies including Coating. Modelling and Simulation, Chemical and Mechanical Post Processing.
Other PM materials
In case a material is produced with powders but none of the above categories can be considered suitable, this is the subtopic to choose.