Structure of grain boundaries with 30°[0 0 0 1] misorientation in dynamically recrystallized magnesium alloys

Li, B.; Liao, Min; Ma, Qin; McClelland, Z.

doi:10.1016/j.commatsci.2015.01.034

Cited by 25 publications

(4 citation statements)

References 33 publications

(54 reference statements)

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“…Due to the six-fold symmetry of hcp crystals about the [0 0 0 1] axis, the two crystals fall in perfect coincidence at misorientation angles of 0° and 60°; hence the GB energies reduce to zero. The trend predicted in figure 3(b) is in good agreement with the earlier works on hcp materials like Mg [27] and Ti [28].…”

Section: Gb Structures and Energiessupporting

confidence: 91%

Effect of symmetrical and asymmetrical tilt grain boundaries on radiation-induced defects in zirconium

Singh¹,

Parashar²

2018

J. Phys. D: Appl. Phys.

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In this article, molecular-dynamics-based simulations were used to study the effect of grain boundaries (GBs) on the formation and spatial distribution of radiation-induced point defects. In order to perform this study, two sets of symmetrical and asymmetrical tilt grain boundaries were constructed along [0 0 0 1] and [0 −1 1 0] as the tilt axis, respectively. Vacancy, interstitial and Frenkel pair formation energies were estimated as a function of the distance from the GB core for both symmetrical as well as asymmetrical tilt GBs. The trend obtained between GB energies and point defect formation energies helps explain the biased absorption of interstitials over vacancies in most cases, as well as the equal absorption of both kinds of point defects in a few of them. It has already been reported from the experimental work that [0 0 0 1] GB structures closely resemble the polycrystalline texture of hcp materials, which motivates us to study the effect of irradiation on these GBs.

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Section: Gb Structures and Energiessupporting

confidence: 91%

Effect of symmetrical and asymmetrical tilt grain boundaries on radiation-induced defects in zirconium

Singh¹,

Parashar²

2018

J. Phys. D: Appl. Phys.

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“…This result is in agreement with the most intense -plane interface peak found in our simulations (2 = 29.32 , corresponding to a 30.162 interface angle). The dominant deformation mechanisms and energies involved in the formation of these grain boundaries were previously addressed on the basis of extensive experimental reports using EBSD as the main characterization technique (Suwas et al, 2007;Silva et al, 2017;Ostapovets et al, 2011;Cepeda-Jimé nez et al, 2015;Del Valle et al, 2002;Li et al, 2015). Here we show that the statistically averaged interpretation of synchrotron XRD reveals the local atomic configuration of the grain interface as additional information with respect to other techniques.…”

Section: Discussionmentioning

confidence: 67%

Retrieving the configuration of grain boundary structure in polycrystalline materials by extraordinary X-ray reflection analysis

Aarão-Rodrigues¹,

Isaac²,

Figueiredo³

et al. 2020

J Appl Cryst

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The development of materials is strongly related to our capability of understanding thermal, mechanical and chemical processing on the nanoscale. Unravelling the interface structure is crucial for opening new regimes in property–performance space. Interface arrangements have been characterized by statistically limited microscopy techniques. In this work, a large-angular-range detector was used for synchrotron diffraction measurements on commercially pure Mg. Long acquisitions allowed the retrieval of preferred interface configurations through the observation of extraordinary diffraction peaks located close to the Mg 102, 200, 204 and 300 fundamental reflections. A kinematical simulation scanning possible interface structures established the correspondence of the non-bulk peaks to the interfacial organization of atoms that may be responsible for their appearance. Simulated interfaces were probed for a wide range of angular displacements with respect to the main cleavage planes. The results indicate configurations that allow the observation of X-ray diffraction, representing a long-range-ordered pattern of atomic distributions in Mg. The introduced methodology allows for nondestructive monitoring of systems that undergo processes that modify grain sizes and grain-interface orientation.

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“…However, there are numerous reasons to exclude the PSN process, among which the most important is the misorientation between parent–daughter grains. It was found by several authors that the orientation between dynamically recrystallized grain and the original grain reaches approximately 30° [ 44 , 45 ]. Based on that, we used GOS to identify non-recrystallized grains with the presence of recrystallized grains in the structure.…”

Section: Discussionmentioning

confidence: 99%

Microstructural and Mechanical Characterization of Newly Developed Zn-Mg-CaO Composite

et al. 2022

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In this study, the Zn-0.8Mg-0.28CaO wt.% composite was successfully prepared using different conditions of ball milling (rotations and time) followed by a direct extrusion process. These materials were characterized from the point of view of microstructure and compressive properties, and the correlation between those characteristics was found. Microstructures of individual materials possessed differences in grain size, where the grain size decreased with the intensified conditions (milling speed and time). However, the mutual relation between grain size and compressive strength was not linear. This was caused by the effect of other factors, such as texture, intermetallic phases, and pores. Material texture affects the mechanical properties by a different activity ratio between basal and pyramidal <c + a> slips. The properties of intermetallic particles and pores were determined in material volume using micro-computed tomography (µCT), enhancing the precision of our assumptions compared with commonly applied methods. Based on that, and the analysis after the compressive tests, we were able to determine the influence of aspect ratio, feret diameters, and volume content of intermetallic phases and pores on mechanical behavior. The influence of the aspects on mechanical behavior is described and discussed.

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Structure of grain boundaries with 30°[0 0 0 1] misorientation in dynamically recrystallized magnesium alloys

Cited by 25 publications

References 33 publications

Effect of symmetrical and asymmetrical tilt grain boundaries on radiation-induced defects in zirconium

Effect of symmetrical and asymmetrical tilt grain boundaries on radiation-induced defects in zirconium

Retrieving the configuration of grain boundary structure in polycrystalline materials by extraordinary X-ray reflection analysis

Microstructural and Mechanical Characterization of Newly Developed Zn-Mg-CaO Composite

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