“…Consistently, it can be found that Al and Cr – STEM mappings are most effective to reveal the distribution of merged γ ′ after complicated dislocation annihilation and multiplication (Figure 3). Related work [25] has already demonstrated that the merging or dissolution of γ ′ precipitates during annealing would reduce the resistance of grain boundary migration, which facilitated the further progressing of recrystallization. Figure 3 Bright field STEM image (a) and corresponding Al and Cr-STEM mappings (b,c) of the grit-blasted DD6 alloy after annealed at 1100°C for 2 h.…”
Section: Results Analysis and Discussionmentioning
In this work, detailed experimental insights regarding the microstructural features on surface recrystallisation of a grit-blasted single crystal superalloy DD6 have been obtained by transmission electron microcopy (TEM), scanning transmission electron microcopy (STEM), scanning electron microscopy and electron backscattered diffraction (EBSD) techniques. The broadened diffraction ring arcs typical for micro-textures revealed the fragmented finer grains after surface grit-blasting. Energy dispersive spectroscopy analysis and STEM mapping confirmed the characteristic elements for differentiation of γ′ and γ phase, and the precipitated secondary or tertiary γ′ in the recrystallised region was characterised by dark field TEM. Moreover, the recrystallisation depth was feasibly revealed by ion-etching and further used for EBSD imaging without polishing. The resulted EBSD pole figures and misorientation profiles confirmed that the recrystallised region exhibited a rather random orientation, destroying the original single crystal type.
“…Consistently, it can be found that Al and Cr – STEM mappings are most effective to reveal the distribution of merged γ ′ after complicated dislocation annihilation and multiplication (Figure 3). Related work [25] has already demonstrated that the merging or dissolution of γ ′ precipitates during annealing would reduce the resistance of grain boundary migration, which facilitated the further progressing of recrystallization. Figure 3 Bright field STEM image (a) and corresponding Al and Cr-STEM mappings (b,c) of the grit-blasted DD6 alloy after annealed at 1100°C for 2 h.…”
Section: Results Analysis and Discussionmentioning
In this work, detailed experimental insights regarding the microstructural features on surface recrystallisation of a grit-blasted single crystal superalloy DD6 have been obtained by transmission electron microcopy (TEM), scanning transmission electron microcopy (STEM), scanning electron microscopy and electron backscattered diffraction (EBSD) techniques. The broadened diffraction ring arcs typical for micro-textures revealed the fragmented finer grains after surface grit-blasting. Energy dispersive spectroscopy analysis and STEM mapping confirmed the characteristic elements for differentiation of γ′ and γ phase, and the precipitated secondary or tertiary γ′ in the recrystallised region was characterised by dark field TEM. Moreover, the recrystallisation depth was feasibly revealed by ion-etching and further used for EBSD imaging without polishing. The resulted EBSD pole figures and misorientation profiles confirmed that the recrystallised region exhibited a rather random orientation, destroying the original single crystal type.
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