Analysis ofin situshearing mechanisms of γ′ precipitates in a nickel-based superalloy at 1120 K

Influence of secondary precipitates and crystallographic orientation on the strength of single crystals of a Ni-based superalloy

“…[1,[8][9][10] In the ␥Ј precipitates, two a/2 ͗112͘ dislocations with the same Burgers vector split into solely by the solid-solution strength of Cr at ␥-␥Ј interfaces. In this study, a distribution of hyperfine secondary precipithree pairs of Shockley dislocations (super-Shockley dislocations [11] ) having a unique Burgers vector and being separated tates in the matrix channel was observed in the single-aged specimen (Figure 3(a)). Hopgood and Martin found that by superlattice intrinsic/extrinsic stacking faults (S-ISF/S-ESF).…”

“…The second aging at 850 ЊC caused these hyperfine precipitates to go back into solution and to reprecipitate as al. [11] observed shearing processes of ␥Ј and ␥ phases by super-Shockley dislocations in situ and revealed that a superlarge precipitates. Extensive cooperative shearing of the ␥-␥Ј structure by the {111}͗112͘ slip, which promotes a large Shockley 2␦C dislocation splits into two identical Shockley ␦C dislocations on two adjacent close-packed planes in the ␥ phase, and that these would shear the ␥ channel separately.…”

“…[14] In this case, both partials are tightly linked by a shuffled planar core. [11] Courbon et cooling. The second aging at 850 ЊC caused these hyperfine precipitates to go back into solution and to reprecipitate as al.…”

“…Hopgood and Martin found that by superlattice intrinsic/extrinsic stacking faults (S-ISF/S-ESF). [1,[8][9][10][11][12][13] This is viscous slip in the L1 2 -lattice precipisecondary ␥Ј precipitation occurred after creep only in the single-aged specimen. The ␥ matrix is supersaturated for tate [13] by the net Burgers vector of a͗112͘.…”

Quantitative in situ experiments and possible artifacts

“…The extrapolation to At = 0 of this plot gives the instantaneous mobile dislocation density /9m. 8. Artifacts.…”