Alloy and Microstructural Design by John K. Tien PDF

By John K. Tien

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For the most part, the limitation on a + β Ti alloys is not strength, but rather fracture toughness at a given strength level, stress corrosion resistance, or creep strength, all of which are analyzed in later chapters. The former two properties are usually important for ambient or nearambient temperature applications whereas creep strength is important at higher temperatures. The ambient temperature properties are dis­ cussed below whereas creep is discussed in Chapter IV. Fig. 2 2 . Light micrograph showing very fine microduplex structure obtained by hotworking and recrystallizing Ti-6Al-2Sn-4Zr-6Mo in the (a + β)-phase field.

As is found in single-phase ordered materi­ als, dislocations encounter less resistance if they glide as pairs. We will consider two cases: alloys with a low volume fraction of particles and alloys with a high volume fraction of particles. The discussion of the low-volume-fraction case is based on the analyses of Gleiter and Hornbogen (1965a,b) and Brown and Ham (1971). The discussion of the high-volume-fraction case is based on the analysis of Copley and Kear (1967). In both cases we will consider the effect of increasing particle size.

Composite Strengthening Composite strengthening is discussed in detail in Chapter III. It will be reviewed here briefly for the sake of completeness of the discussion of high-temperature strengthening mechanisms. Composite strength­ ening is similar in some respects to dispersion strengthening. Both methods involve the dispersion of a nondeformable second phase in a ductile matrix and give effective strengthening at temperatures ap­ proaching the melting point of the alloy. Also, both methods produce greater ductility losses than solution strengthening or precipitation strengthening methods because of the resulting inhomogeneity of strain.

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