Interfacial dislocation networks strengthening a fourth-generation single-crystal TMS-138 superalloy

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 33; no. 12; pp. 3741 - 3746
• Main Authors: ZHANG, J. X, MURAKUMO, T, KOIZUMI, Y, KOBAYASHI, T, HARADA, H, MASAKI, S. JR
• Format: Journal Article
• Language: English
• Published: New York, NY Springer 01-12-2002
• Subjects: Applied sciences; Condensed matter: structure, mechanical and thermal properties; Creep; Exact sciences and technology; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Metals. Metallurgy; Physics; Nickel base alloys; Crystal defects; Misfit dislocations; Property composition relationship; Dislocation structure; Dislocation glide; Experimental study; Superalloys; Multi-element alloys; Dislocations; Dislocation climb; Monocrystals; Transmission electron microscopy; Creep fracture; Dislocation arrays; Creep deformation; Strain rate
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-002-0246-7

The gamma / gamma ' interfacial dislocation networks in several creep-ruptured superalloys were analyzed. It was found that the morphologies of dislocation networks differ slightly from each other in these alloys. The fourth-generation superalloy has finer dislocation networks and keeps a relatively stable state. Comparatively, the interfacial dislocations in the third-generation superalloy show obvious curved features associated with possible climb or slip. These interfacial dislocation characteristics can be correlated with the creep behavior of these superalloys. The mechanisms of evolution of the interfacial dislocation networks were discussed. (vert bar) a Ishikawajima-Harima Heavy Industries