John K. Tien's Alloy and Microstructural Design PDF

By John K. Tien

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This transition is illustrated in Fig. 16. As mentioned above, precipitation strengthening in the conventional wrought Al alloys is capable of yielding strengths in excess of what can be practically employed because of other considerations. Thus alternate strengthening methods should be employed in order to provide com­ bined high strength and good stress corrosion resistance. One approach has been demonstrated by Paton and Sommer (1973), who have em- 40 Stephen Μ. Copley and James C. Williams Fig.

Instead, it is suggested that interface strengthening plays a major role in these alloys. The strength increase has been shown to depend on α-phase volume fraction (Fig. 26) (Wil­ liams and Rhodes, 1974). This is also consistent with interface strength­ ening since the interfacial area also increases with volume fraction, es­ pecially in the present case where the α phase forms as plates, the Fig. 25. Light micrograph showing heavy precipitation of a phase at β grain bounda­ ries in Ti-8Mo-8V-2Fe-3Al quenched from 1175°K and aged 4 hr at 775°K.

Earlier work by Byrne et al. 7% Cu is strongest when aged to contain GP zones. This work also shows that there is a major increase in work hardening rate which accompanies the θ" —» θ' transition. This can have important implica­ tions in fracture behavior. Silcock et al. (1953-1954) have also examined the hardening response of A l - 4 % Cu and have shown that the maximum hardness corresponds to the maximum volume fraction of Θ". This suggests that the maximum strength microstructure depends on alloy composition.

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