View Sample Alloy Digest Data Sheet (PDF)Since 1952, Alloy Digest has been the leading reference for materials property data on metals and alloys used throughout the world. Featuring graphs, charts and tables, these sheets give facts and figures on composition or characterization, physical and mechanical properties, heat treatment, and machinability.Alnico - IV is an un-oriented permanent-magnet iron-base alloy. It is a general purpose alloy for use where space limitations make short magnets necessary. It is supplied in the as-cast or as-sintered condition.