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.Alcoa 2024 was introduced by Alcoa in 1931 as the first alloy to have a yield strength approaching 345 MPa (50 ksi). With relatively good fatigue resistance in plate forms, alloy 2024 continues in many aerospace structural applications.