After a successful trial, we now have access to the ASM Alloy Phase Diagrams Center. This resource provides access to more than 11,000 binary and ternary phase diagrams and associated phase data for more than 2,400 systems. The collection will be updated to include 10,000 binary and 20,000 ternary diagrams. The first update will occur in September and include close to 18,000 ternary diagrams.

See their Introduction to Phase Diagrams for an overview.