Atomic configurations of planar defects in μ phase in Ni-based superalloys

mu topologically close-packed phase commonly forms in superalloys and its intrinsic deformation is critical for their performance. Atomic configurations of planar defects in mu phase have been investigated by aberration-corrected scanning transmission electron microscopy and geometrical structure analysis. It is found that the basal slip in mu phase is accomplished by synchroshear inside Laves triple-layers, whereas shear deformations on non-basal planes are associated with long-range diffusions or local atomic rearrangements. Distinct from that on (1 (1) over bar 02) pyramidal planes, displacement vectors of planar faults on ( 1 (1) over bar 101) pyramidal planes deviate from the slip plane, leading to the contraction or dilation faulted regions. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

The mu phase commonly forms in superalloys and its intrinsic deformation is critical for their performance. The atomic configurations of planar defects in the mu phase have been investigated using aberration-corrected scanning transmission electron microscopy. The basal slip in the mu phase is achieved by synchroshear inside Laves triple-layers, while shear deformations on non-basal planes are related to long-range diffusions or local atomic rearrangements.