| http://www.w3.org/ns/prov#value | - metal isaluminum or magnesium, and the light metal alloy is an alloy including at least one of aluminum and magnesium, wherein the secondary material is cast iron, iron steel, stainless steel, Fe--Cr-based alloy, Ni-based alloy, or ceramic, wherein the porousmaterial is composed of a metal fiber or a foamed metal by which a diffusion joining can be performed with the secondary material, and where
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