By D.G. Provis, R. Radok
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Extra resources for Waves on Water of Variable Depth
The “acicular” martensite consists of an intimate mixture of individual α plates, each having a different variant of the Burgers relationship (Fig. 15). Generally, the martensitic plates contain a high dislocation density and sometimes twins. The hexagonal α' martensite is supersaturated in β stabilizers and, upon annealing in the (α+β) phase field, decomposes to α+β by precipitating incoherent β particles at dislocations or β phase layers at plate boundaries. 21]. This orthorhombic martensite is designated α''.
8Mo. An exception, where the presence of the compound is desirable, is the β eutectoid forming element Si, which is a common addition to titanium alloys for high temperature application. In this case, the precipitation of the intermetallic compound Ti5Si3 is deliberately used for the improvement of creep properties (see Sect. 2). Fig. 13. 16] 28 2 Fundamental Aspects It should be emphasized, however, that most commercial titanium alloys are multicomponent alloys. As mentioned earlier, the binary phase diagrams can serve only as a qualitative guideline.
Fig. 8. 5 Phase Diagrams 23 Fig. 9. 3. 5 Phase Diagrams Alloying elements in titanium are usually classified into α or β stabilizing additions depending on whether they increase or decrease the α/β transformation temperature of 882°C of pure titanium. The substitutional element Al and the interstitial elements O, N, and C are all strong α stabilizers and increase the transus temperature with increasing solute content, as can be seen from the schematic phase diagram in Fig. 10. Aluminum is the most widely used alloying element in titanium alloys, because it is the only common metal raising the transition temperature and having large solubilities in both the α and β phases.