Investigating the Dislocation-Driven Micro-mechanical Response Under Non-isothermal Creep Conditions in Single-Crystal Superalloys

Abstract

The creep responses of the superalloy CMSX-4 under thermal cycling conditions (900-1050ºC) and constant load (200 MPa) was analyzed using TEM dislocation analysis and compared to the modelled evolution of key creep parameters. By studying tests interrupted at different stages of creep, it is argued that the thermal cycling creep rate under these conditions depends on the creation of interfacial dislocation networks and their disintegration by the -shear of dissimilar Burgers vector pairs.