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Understanding the creep mechanisms and deformation response at differentstresses and temperatures is crucial for design using nickel-base superalloysfor high-temperature applications. In this study, the creep behaviour of anewly designed superalloy (nominated Alloy 11) at different stress andtemperature was systematically investigated using SEM, STEM, EBSD andsynchrotron X-ray diffraction. Material properties and mechanical response wereanalysed by considering such properties as lattice parameters and misfit, phasevolume fraction, microstrain in reference and crept samples. Detwinning anddynamic recrystallization were observed for the crept samples. STEMcharacterization of deformed materials reveals that multiple deformationmechanisms and defects could be identified in crept samples, namely,dislocations in the gamma matrix channels and in gamma prime precipitates,along with continuous and isolated stacking faults. The highest values oflattice misfit, microstrain and lattice parameter change were observed at thecentre of dogbone-shaped crept samples. This was associated with the humpshaped temperature distribution profile during creep testing. The significantspatial variation detected in terms of lattice parameters, misfit andmicrostrain supports the conclusion that it is important to perform spatiallyresolved measurements instead of considering each sample as a singlemeasurement point when investigating creep response. It is also worth notingthat the statistics of the lattice-parameter distribution for the gamma andgamma prime phases obey a gaussian distribution. In conclusion, a discussion isgiven for the meaning and implications of these findings for future research.

The creep deformation of a new nickel-base alloy-by-design studied using synchrotron X-ray diffraction