STRAIN INDUCED DIRECTIONAL CONARSENING IN NICKEL BASED SUPERALLOYS: INVESTIGATION ON KINETICS USING THE SMALL ANGLE NEUTRON SCATTERING (SANS) TECHNIQUE

摘要

Using the small angle neutron scattering technique, we have observed rafting in nickel based single crystal superalloys. Kinetics of morphological evolution of the precipitates have been studied in situ. Therefore we used a special furnace designed for the ageing of prestrained specimens under a neutron Beam. The evolution of both the precipitate aspect ratio and the distance between precipitate4s confirms The importance of strain in the directional coarsening process.