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.DOWMETAL R and DOWMETAL RC, the die casting alloys in most general use, are the 9% A1, 1% Zn magnesium alloys AZ91A and AZ91B. They combine good mechanical properties, good casting characteristics and good resistance to corrosion. A variation, designated as Dowmetal AZ91C, is used for sand and permanent mold castings.