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The role of surface condition, residual stress and microstructure on pre-yield cracking in Ti44Al8Nb1B

“…6. Such surface cracks have been observed in earlier work [4] and internal interlamellar cracking has been found in samples tested to failure [11]. Duplex microstructure As-machined 450 300 600 300 Machined+0.5 h @ 700 C 300 250 300 250 Table 3 The minimum value of tensile stress at which acoustic emission signals were detected in variously prepared samples of Ti44Al8Nb1B …”

Effects of Si and C additions on the thermal stability of directionally solidified TiAl–Nb alloys

“…In particular, fully lamellar two-phase alloys consisting of TiAl (g) and Ti 3 Al (a 2 ) have received considerable attention because of their high-temperature strength and room-temperature toughness, superior to those of other microstructure types such as near gamma, duplex, and nearly lamellar types [4]. However, the mechanical properties, especially the room-temperature ductility and high-temperature strength of TiAl-based alloys of this microstructure type, have to be further improved for widespread industrial applications.…”

An ATEM study of oxidation behavior of SCC crack tips in 304L stainless steel in high temperature oxygenated water

“…19. The strain-localized bands have been found ahead of a crack tip in many deformed materials such as TiAl alloy [27,28] and in a fatigued copper single crystal [29]. In theory, Rice and Drucker [30] have proved that the strain-localized band usually occurs in the plane stress condition.…”