Within the class of β alloys, a distinction can be made between so-called “high
strength” β alloys which are located with their chemical composition close to the
β to α+β alloy boundary (see Fig. 2.19) and contain therefore a high volume fraction
of α phase and so-called “heavily stabilized” β alloys which are located more
to the right in the pseudo-binary phase diagram of Fig. 2.19.