Effect of special boundaries on recrystallization texture of FCC metals with high packing defect energy

Данилов, С. В.; Резник, П. Л.; Зорина, М. А.; Лобанов, М. Л.

doi:10.1063/1.5134358

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Specifically, the proportion of Σ3 boundaries has risen from approximately 0.6% to around 5%, while the fraction of Σ11 boundaries has increased from 1.3% to 6.3%. Furthermore, the fraction of Σ25b (nucleus of primary recrystallisation) [41] has significantly increased from 0.76% to about 7.77%. It is worth mentioning that the distribution of Σ CSL boundaries in the KoBo extruded state is similar to that observed in the LPBF state, where these boundaries are predominantly situated close to grains with low grain-orientation-spread values.…”

Section: Resultsmentioning

confidence: 99%

“…The recrystallisation texture displays an axial pattern, which can be attributed to the formation of recrystallisation growth nuclei with orientations near 〈100〉 and 〈111〉 in the deformed grains exhibiting corresponding orientations. These nuclei grow within the surrounding deformed matrix when their misorientation with the neighbouring area aligns at an angle close to 52 • around one of the crystallographic axes, specifically 〈331〉 [41]. As a result, the misorientation closely approximates the CSL (Coincidence Site Lattice) misorientation Σ25b (see Figure 8b).…”

Section: Texture Analysismentioning

confidence: 94%

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Characterisation of Microstructure and Special Grain Boundaries in LPBF AlSi10Mg Alloy Subjected to the KoBo Extrusion Process

Snopiński,

Matus

2023

Symmetry

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Grain boundary engineering (GBE) enhances the properties of metals by incorporating specific grain boundaries, such as twin boundaries (TB). However, applying conventional GBE to parts produced through additive manufacturing (AM) poses challenges, since it necessitates thermomechanical processing, which is not desirable for near-net-shape parts. This study explores an alternative GBE approach for post-processing bulk additively manufactured aluminium samples (KoBo extrusion), which allows thermo-mechanical treatment in a single operation. The present work was conducted to examine the microstructure evolution and grain boundary character in an additively manufactured AlSi10Mg alloy. Microstructural evolution and grain boundary character were investigated using Electron Back Scattered Diffraction (EBSD) and Transmission Electron Microscopy (TEM). The results show that along with grain refinement, the fraction of Coincidence Site Lattice boundaries was also increased in KoBo post-processed samples. The low-Σ twin boundaries were found to be the most common Coincidence Site Lattice boundaries. On the basis of EBSD analysis, it has been proven that the formation of CSL boundaries is directly related to a dynamic recrystallisation process. The findings show prospects for the possibility of engineering the special grain boundary networks in AM Al–Si alloys, via the KoBo extrusion method. Our results provide the groundwork for devising GBE strategies to produce novel high-performance aluminium alloys.

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Section: Resultsmentioning

confidence: 99%

Section: Texture Analysismentioning

confidence: 94%

Characterisation of Microstructure and Special Grain Boundaries in LPBF AlSi10Mg Alloy Subjected to the KoBo Extrusion Process

Snopiński,

Matus

2023

Symmetry

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Engineering an ultra-fine grained microstructure, twins and stacking faults in PBF-LB/M Al-Si alloy via KoBo extrusion method

Snopiński,

Matus,

Łagoda

et al. 2024

Journal of Alloys and Compounds

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The Spectrum of Crystallographic Misorientations of Intercrystalline Boundaries for BCC-HCP Phase Transformation in Additively Manufactured Ti-6Al-4V

Редикульцев

Stepanov

Лобанов

2021

DDF

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Electron backscatter diffraction is a modern experimental method for local structure and texture investigation, which makes it possible to establish the presence and types of the various boundaries between the elements of the mesostructure such as low or high angle, special and interphase boundaries. Moreover, this technique can demonstrate the migration of boundaries during structural and phase transformations. This study estimated the possible spectrum of crystallographic misorientations of intercrystalline boundaries in additively manufactured titanium alloy Ti-6Al-4V using orientation microscopy and crystallographic calculations based on Burgers orientation relationship during β→α-transformation. The study has established that the boundaries between grains of α-phase are characterized by the misorientation angles of 11±2 °, 61±5 °, 89±3 °. The majority of high-angle boundaries are characterized by misorientation angles in the range of 57-65 °. The study also ascertained that the experimental spectrum of intercrystalline boundaries in the α-phase reveals the displacive nature of β→α-transformation in titanium alloys.

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Effect of special boundaries on recrystallization texture of FCC metals with high packing defect energy

Cited by 3 publications

References 18 publications

Characterisation of Microstructure and Special Grain Boundaries in LPBF AlSi10Mg Alloy Subjected to the KoBo Extrusion Process

Characterisation of Microstructure and Special Grain Boundaries in LPBF AlSi10Mg Alloy Subjected to the KoBo Extrusion Process

Engineering an ultra-fine grained microstructure, twins and stacking faults in PBF-LB/M Al-Si alloy via KoBo extrusion method

The Spectrum of Crystallographic Misorientations of Intercrystalline Boundaries for BCC-HCP Phase Transformation in Additively Manufactured Ti-6Al-4V

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