Recycling of a material is defined as submitting the material to secondary processing steps that produce the same material with the same properties as the original primary product. Recycling can in some instances be conducted several times, the material undergoing, after primary processing, several cycles of secondary processing, service, and recovery without significant degradation. This is, for instance, the case for conventional aluminum alloys (Krüger 2000, ASM 1999), which can be remelted and processed with full restoration of the primary microstructure, resulting in identical material properties. Recycling can be done within the production line without any service exposure of the material, or after re-collection of components already out of service. In the latter case some degradation of the material is expected, which would have to be repaired by the recycling process. Alternatively, a material can be processed by reclamation, in which case it is processed to a different form or microstructure to produce a different, but still useful, material.