Three-dimensional geometry of “square-like” dislocation network in nickel-base single crystal superalloy

Abstract

Detailed characterizations of interfacial dislocation networks in a nickel-base single crystal superalloy after creep loading for 85 h at 1100 °Cand 130 MPa were carried out at larger magnifications. The “square-like” dislocation network is formed by dislocation reaction including a[010], a/2[110], a/2[11¯0] dislocations and is different from square (and hexagonal) networks in formation mechanism and geometric structure. The atomic structure of core region of dislocations indicates their individual features and highlights the three-dimensional geometry of “square-like” dislocation network for the first time.