Some Deformation Micromechanisms in Ni-Based Superalloys Evidenced Using TEM In Situ Experiments
In situ straining of microsamples have been carried out at different temperatures in a transmission electron microscope (TEM) to provide information about the elementary micromechanisms, which control the deformation in Ni-based superalloys at the nano and microscopic scales. The obstacles to the propagation of the dislocations have been identified and quantified when possible. The strengthening effect in the -matrix channels and the shearing of ' precipitates have been chosen to illustrate some results deduced from moving dislocation analysis. A quantitative evaluation of the stresses acting on dislocations has been performed. The shearing process of the ' precipitates at 850°C has been precisely analysed.
F. Pettinari-Sturmel et al., "Some Deformation Micromechanisms in Ni-Based Superalloys Evidenced Using TEM In Situ Experiments", Advanced Materials Research, Vol. 278, pp. 90-95, 2011