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.ALLVAC 80A is an 80% Ni/20% Cr alloy which is strengthened by precipitation hardening through the addition of Ti and A1. It is produced by vacuum induction plus vacuum are remelting.