Atomic configurations of planar defects in μ phase in Ni-based superalloys. (1st March 2021)

• Record Type: Journal Article
• Authors: Cheng, Yongxin; Wang, Guanglei; Liu, Jide; He, Lianlong
• Is Part Of: Scripta materialia. Number 193(2021)
• Page Start: 27
• Page End: 32
• Publication Date: 2021-03-01
• Subjects: μ phase -- Planar defects -- HAADF-STEM -- Displacement vectors -- Atomic configurations; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.09.045
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: μ topologically close-packed phase commonly forms in superalloys and its intrinsic deformation is critical for their performance. Atomic configurations of planar defects in μ phase have been investigated by aberration-corrected scanning transmission electron microscopy and geometrical structure analysis. It is found that the basal slip in μ 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 ¯ 02) pyramidal planes, displacement vectors of planar faults on ( 1 ¯ 101) pyramidal planes deviate from the slip plane, leading to the contraction or dilation faulted regions. Graphical abstract: Image, graphical abstract