Straining experiments were performed in situ, in a high-voltage electron microscope, on the oxide dispersion-strengthened superalloy at 1020 or 1065K. The results could be explained by the interfacial pinning of dislocations at dispersoids and, in some cases, by the Orowan mechanism. In addition to the thermally activated detachment of dislocations from particles, a viscous friction mechanism (which was perhaps due to point-defect diffusion in dislocation cores) and Taylor hardening contributed to the flow stress.

Interaction Processes between Dislocations and Particles in the ODS Nickel-Based Superalloy Inconel MA 754 Studied by Means of in situ Straining in a HVEM. D.Häussler, B.Reppich, M.Bartsch, U.Messerschmidt: Materials Science and Engineering A, 2001, 309-310, 500-4