Grain boundary phases in bcc metals

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WebNov 17, 2024 · While grain boundary structures created by the \gamma-surface method as a union of two perfect half crystals have been studied extensively, it is known that the … WebWe report a computational discovery of novel grain boundary structures and multiple grain boundary phases in elemental bcc tungsten. While grain boundary structures …

[1711.06775] Grain boundary phases in bcc metals

WebApr 14, 2024 · In addition, the increase in the number of polygonal and quasi-polygonal ferrites in the top region of slow cooling, the formation of both phases associated with carbon diffusion, which allows bulk M-A components to form within the grain and at the boundary of polygonal and quasi-polygonal ferrites. WebApr 10, 2024 · In this study, we focus on two tilt symmetric grain boundaries (GBs) Σ5(210) and Σ5(310) commonly observed in the polycrystalline metals and alloys [].In order to establish MD models, two symmetric BCC Hf grains are first combined to construct a central GB (Fig. 1a). The lattice constant is taken as 3.431 Å, which is the average value of the … how to set up a dba

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WebApr 10, 2024 · In this study, we focus on two tilt symmetric grain boundaries (GBs) Σ5(210) and Σ5(310) commonly observed in the polycrystalline metals and alloys [].In order to … http://mimp.materials.cmu.edu/rohrer/papers/2015_03.pdf WebDec 7, 2024 · In this review, the phenomenon of grain boundary (GB) wetting by the second solid phase is analyzed for the high entropy alloys (HEAs). Similar to the GB wetting by the liquid phase, the GB wetting by the second solid phase can be incomplete (partial) or complete. In the former case, the second solid phase forms in the GB of a matrix, the … notes on hamlet

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WebWe report a computational discovery of novel grain boundary structures and multiple grain boundary phases in elemental bcc tungsten. While grain boundary structures created … WebMar 17, 2024 · In contrast, at the later stage, shear bands were observed on the grain boundaries. Thus the slip of grain boundary may dominate the deformation of the later stage. (2) For the CoCrFeNiMn x HEAs, when the manganese content is higher than 5 at%, the HEAs will no longer be the single phase FCC solid solution, and the BCC, HCP, and … how to set up a dba in delawareWebFeb 23, 2024 · Firstly, a single-phase body-centered cubic (BCC) solid solution is identified in both as cold-rolled and recrystallized states at 1000 °C, and the tensile strength decreases as the annealing time increases. how to set up a dba in ct

"WebNov 18, 2024 · While grain boundary structures created by the \gamma-surface method as a union of two perfect half crystals have been studied extensively, it is known that the method has limitations and does not always predict the correct ground states. " - Grain boundary phases in bcc metals

Grain boundary phases in bcc metals

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WebDec 7, 2024 · In this review, the phenomenon of grain boundary (GB) wetting by the second solid phase is analyzed for the high entropy alloys (HEAs). Similar to the GB wetting by the liquid phase, the GB... WebSep 17, 2024 · The IGC samples consist of equiaxed nano-sized grains (15.4 ± 3 nm) as shown in Fig. 1a and exclusively of the BCC phase as detected by XRD and TEM (Supplementary Fig. 1 ). The IGC nanograined...

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WebFeb 6, 2024 · The concentration of Al at the grain boundaries of medium-entropy alloy CrCoNiAl 0.014 was higher at 300 k than at 700 k (Figure 5e,f and Figure 6e,f). The formation of the BCC crystal structure on the grain boundary surface of the medium-entropy alloy CrCoNiAl 0.014 is related to the increase in the concentration of Al at the … WebThe grain boundaries separate variously-oriented crystal regions (polycrystalline) in which the crystal structures are identical. Figure 3(b) represents four grains of different …

WebSep 23, 2024 · A suite of 37 molecular dynamics simulations is conducted at two system sizes to systematically characterize the role of grain boundary (GB) misorientation on … WebFeb 7, 2024 · We use atomistic simulations to investigate grain boundary (GB) phase transitions in elemental body-centered cubic (bcc) metal tungsten. Motivated by recent modeling study of grain boundary phase transitions in [100] symmetric tilt boundaries in face-centered cubic (fcc) copper, we perform a systematic investigation of [100] and …

http://mimp.materials.cmu.edu/rohrer/papers/2015_03.pdf WebFeb 1, 1995 · In grain boundaries with a high segregation level the nature and content of the major element strongly vary with GB crystallographic parameters, depending on the orientation of the grain boundary plane. HREM studies of grain boundary structure do not reveal any intergranular glassy phase in the material. References (39) P.H. Pumphrey

WebFeb 1, 2024 · Thus, Gunkelmann et al. , using the modified version of the Ackland EAM potential to study the behavior of polycrystalline iron at a strain rate of about 10 9 s −1, showed that yielding occurs through dislocation activities around the grain boundary at 10 GPa with the onset stress of a structural bcc-to-hcp phase transformation σ T of about ...

WebAbstract. We report a computational discovery of novel grain boundary structures and multiple grain boundary phases in elemental bcc tungsten. While grain boundary structures created by the \gamma-surface method as a union of two perfect half crystals have been studied extensively, it is known that the method has limitations and does not … how to set up a data warehouseWebWhile grain boundary structures created by the γ-surface method as a union of two perfect half crystals have been studied extensively, it is known that the method has limitations … how to set up a dba in ncWebWe use atomistic simulations to investigate grain boundary (GB) phase transitions in elemental body-centered cubic (bcc) metal tungsten. Motivated by recent modeling … how to set up a dba in coloradoWebNov 18, 2024 · Abstract: We report a computational discovery of novel grain boundary structures and multiple grain boundary phases in elemental bcc tungsten. While grain … notes on hdiWebLegal Notes: Deeds/Senior Rights v. Junior Rights. I have been asked to write a column on legal developments relating to land survey issues. My intention is to devote this column … how to set up a dba georgiaWebJan 29, 2024 · Grain boundaries (GBs) can be treated as two-dimensional (2-D) interfacial phases (also called “complexions”) that can undergo interfacial phase-like transitions. As bulk phase diagrams and calculation of phase diagram (CALPHAD) methods serve as a foundation for modern materials science, we propose to extend them to GBs to have … how to set up a dba in californiaWebThis process is particularly convenient for achieving non-equilibrium microstructures in body-centered cubic (BCC) metals, which are not easily produced with nanocrystalline grain sizes through other SPD processes due to the lack of a close-packed slip system facilitating high deformation strains. how to set up a dba in illinois