Statistical aspects of grain-level strain evolution and reorientation during the heating and elastic-plastic loading of a Ni-base superalloy at elevated temperature

The advancement of microstructure-sensitive models for elevated temperature applications requires experimental data at the relevant length scales and usage environments. Towards this goal, we studied evolution grain-level strains in a Ni-based superalloy during heating subsequent loading temperature. specimen was heated using two halogen lamps furnace designed explicitly special load frame used synchrotron-based experiment. High energy X-ray diffraction to non-destructively characterize initial 3D microstructure, confirm specimen, monitor strains, stresses, orientations through elastic-plastic transition. distributions normal were observed broaden with elastic loading, whereas led development local intergranular “hotspots”, or activation plastic slip within select grains, that both skew strain distributions. These fit generalized extreme value (GEV) distribution function. GEV shape parameter is change significantly onset macroscopic plasticity. At grain scale, more reorientation (plasticity) occurred grains oriented lower strength-to-stiffness ratios. During deformation LSHR 660 ∘ C shedding from strength-to-stiffness-oriented higher observed. Additionally, based on grain-averaged axis, it found has preference multiple systems C. We conclude discussion critical need statistical analysis such mesoscale obtained situ verification/validation next generation models.