Investigation of fine-scale dislocation distributions at complex geometrical structures by using HR-EBSD and a comparison with conventional EBSD

Roy, Ronit; Shaik, Adil; Topping, Matthew; Long, Fei; Daymond, Mark R.

doi:10.1016/j.matchar.2023.113498

Cited by 5 publications

(2 citation statements)

References 81 publications

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“…Comparing Figure 7 a and Figure 8 a, it can be observed that the positions of higher KAM in the L# sample correspond to the locations of LABs. The theoretical GND can be calculated based on the KAM, as shown in Formula (1) [ 29 ]:

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Section: Resultsmentioning

confidence: 99%

“…Comparing Figures 7a and 8a, it can be observed that the positions of higher KAM in the L# sample correspond to the locations of LABs. The theoretical GND can be calculated based on the KAM, as shown in Formula (1) [29]: In the formula, 𝜌 represents geometrically necessary dislocations, indicating the extra storage of dislocations produced by plastic deformation of the sample. KAM is the average KAM value in the EBSD test area, µ is the step size chosen for the EBSD test, and b is the length of the Burgers vector, with the Burgers vector for nickel-based single-crystal superalloys is a/2<110>.…”

Section: Dislocations Densitymentioning

confidence: 99%

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Lattice Rotation and Deformation Mechanisms under Tensile Loading in a Single-Crystal Superalloy with [001] Misorientation

Gao,

Zhang,

Liu

et al. 2024

Materials

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This study investigates how deviation angles close to the [001] orientation affect the tensile properties and deformation behavior of a nickel-based single-crystal superalloy at room temperature. The research focuses on samples with deviation angles of 3°, 8°, and 13° from the [001] orientation and examines their strength and ductility. We employed scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) to explore the deformation micro-mechanisms at varying angles. Findings reveal that strength decreases and ductility increases as the deviation angle widens within the [001] vicinity. The study emphasizes that <110> octahedral slip-driven crystal slip and rotation are crucial for understanding tensile deformation. The deformation differences in samples at varying angles are attributed to the differential engagement of mechanisms. Specifically, at lower angles, reduced ductility and increased strength are due to short lattice rotation paths and work hardening causing superlattice stacking faults (SSFs) to slip in two directions on the {111} plane within the γ′ phase. As the angles increase, the lattice rotation paths extend, and Shockley partial dislocations (a/6<112>) accumulate in γ channels. This process, involving SSFs moving in a single direction within the γ′ phase, results in higher ductility and reduced strength.

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Section: Resultsmentioning

confidence: 99%

Section: Dislocations Densitymentioning

confidence: 99%