metal materials material engineering 30 corrosion of material 12 material testing 12 mechanical engineering 8 forming 6 composition materials 5 more ... non-metal materials 5 steel 5 recycling of wastes 5 restoration 5 conservation (art) 4 metals 4 metals and alloys 4 materials 4 wastes 4 mechanical engineering materials 4 physical metallurgy 3 ferrous and steel metallurgy 3 metal constructions 3 machining 3 corrosion protection 3 plastic materials 3 foundry industry 3 technology 3 material defects 3 biological materials 2 biomedical materials 2 deformation of solids 2 ferroalloys 2 less ...