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aST (a), ST (a + p), and ST (p) correspond to solution treatment in the a, a + p, and p-phase fields, respectively. Annealing treatments normally involve shorter times than aging treatments aST (a), ST (a + p), and ST (p) correspond to solution treatment in the a, a + p, and p-phase fields, respectively. Annealing treatments normally involve shorter times than aging treatments

The influence of a morphology was discussed earlier, where it was pointed out that a lenticular shape favors high fracture toughness (Kic) while a globular morphology optimizes ductility. The effect of a morphology and section size on tensile properties and fracture toughness are demonstrated in Tables 8.3 and 8.4 [25] and illustrated in Fig. 8.5 [12]; as strength increases, fracture toughness decreases, and vice versa. Chemistry, particularly the interstitial content (e.g., O2) (Figs. 8.6 and 8.7) [25], influences fracture toughness with high values of Klc associated with low O2 values; and texture can also have an effect [25].

TABLE 8.3 Yield Strength and Plane-Strain Fracture Toughness of Various Titanium Alloys
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