Anisotropic creep behavior of a nickel-based superalloy compared with nickel solid solution and #gamma# ' phase single crystals

摘要

The creep behavior of three different signle crystal alloys with various orientations at a temperature of 1123 K was investigated. The anisotropic behavior of the nickel-based superalloy CMSX-4 has been reported recently [1-4]. The creep rate of [111] oriented crystals is more than two orders of magnitude higher than for [001] orientations. [110] oriented crystals have creep rates in-between these extremes. The creep response of slightly misoriented [001] as well as [011] samples is strongly dependent on the azimuthal deviation from the exact orientation. Microstructural analysis show that the anisotropic creep behavior of the superalloy can be explained by different stress distributions within the matrix channels, different shearing mechanisms and the amount of active glide planes.