Fine atomic-crystalline and magnetic structures of alloys, based on Fe-Ni and Fe-Ni-C systems, is investigated. The relationships of variations in the fine atomic crystalline structure and martensitic transformations with physico-mechanical and thermal properties of alloys are ascertained. The principles and methods are given to produce the multifunctional metallic materials, New approach lies in the fact that the high values of 6-9 needed combinations of properties difficult to connect can be provided via forming a controllable set of submicroregions with certain atomic-crystalline, magnetic and electronic configurations.