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Artykuły w czasopismach na temat „Strain Induced Boundary Migration (SIBM)”

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Data publikacji: 6 września 2023

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1

Natori, Yoshiaki, Kenichi Murakami, Satoshi Arai, Yousuke Kurosaki, Hisashi Mogi i Hotaka Homma. "Effect of Initial Grain Sizes on Strain Induced Boundary Migration". Materials Science Forum 715-716 (kwiecień 2012): 924–29. http://dx.doi.org/10.4028/www.scientific.net/msf.715-716.924.

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Examination of the SIBM mechanism based on the dislocation substructure at the interior of the Goss oriented grain was carried out by changing the grain size prior to the temper rolling. The following results were obtained. 1) SIBM significantly increased Goss orientation during the eminent grain growth with the initial grain sizes from 18 to 55μm. 2) When the initial grain sizes were large, i.e. 37μm and 55μm, the rolling with the reduction beneath the critical value could not promote SIBM, even the normal grain growth could also be hindered. Consequently a proposal was made that the nucleation of the recovery appeared among substructure domains containing sluggish strain. There exists an adequate size of the domain which varies with the change both of the rolling reduction and the initial grain size.

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2

Murakami, Kenichi, Jacek Tarasiuk, H. Réglé i Brigitte Bacroix. "Study of the Texture Formation during Strain Induced Boundary Migration in Electrical Steel Sheets". Materials Science Forum 467-470 (październik 2004): 893–98. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.893.

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Texture formation through strain induced boundary migration (SIBM) was investigated. Temper rolling reduction before final annealing for SIBM was varied between 0 and 26% and grain sizes and textures were measured using EBSD. In the specimen which was temper rolled to 5%, in which grain growth by SIBM occurred most efficiently, a strong Goss component (which was a minor component after rolling), developed during annealing. From the EBSD image quality analysis, it was found that stored energy increased significantly in the Goss component with strain (from 5 to 9 %), whereas it was always relatively small in the D-Cube component ({001}<110>), compared to Goss and g-fibre components. Based on these results, a mechanism of grain growth by SIBM was suggested. Texture evolution during annealing could thus be explained by the hypothesis, speculated from the analysis of orientation stability, that D-Cube grains are associated with more homogeneous dislocations distributions than Goss grains, in which the co-existence of high and low dislocation density zones could favour grain growth by SIBM.

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3

Ji, Mo, Carl Slater i Claire Davis. "Thermomechanical Processing Map in Retaining {100}//ND texture via Strain-Induced Boundary Migration Recrystallization Mechanism". Metallurgical and Materials Transactions A 51, nr 12 (21.10.2020): 6498–504. http://dx.doi.org/10.1007/s11661-020-06047-x.

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AbstractThe feasibility of establishing thermomechanical conditions to promote {100}//ND fiber texture via strain-induced boundary migration (SIBM) recrystallization mechanism in a non-grain oriented (NGO) electrical steel was investigated. Single-hit uniaxial compression at various temperatures and strains has been applied on Fe-6 wt pct Si to establish the relationship between stored energy and the softening mechanisms. Recovery only and recrystallization by SIBM or by subgrain growth (SGG) have been observed depending on the stored energy level. A strong {100}//ND fiber recrystallization texture, i.e., 45 pct area fraction, was seen in the sample which was deformed to 0.2 strain at 650 °C and then annealed at 1000 °C for 15 minutes, whereas only 13 pct {100}//ND fiber component was observed after 0.4 strain at 500 °C followed by the same annealing treatment. By examining the same microstructural region before and after annealing via EBSD, it has been shown that {100}//ND textured recrystallized grains were formed adjacent to the {100}// ND textured deformed matrix. Low stored energy has been shown to favor the formation of {100}//ND texture recrystallized grains via SIBM recrystallization mechanism attributed to its slow recrystallization nucleation rate. The results from the deformation studies have been used to suggest a processing window map concept to define the recovery, SIBM, and SGG regions for the starting as-cast columnar microstructure.

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4

Muhammad, Waqas, Daniel Wei i Étienne Martin. "Grain Boundary Engineering of Strain-Annealed Hastelloy-X". Materials Science Forum 1016 (styczeń 2021): 852–56. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.852.

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The present study investigates the occurrence and effectiveness of the dissociation mechanism of Σ3 CSL boundaries into its variants such as Σ9 and Σ27a-b during strain-annealed grain boundary engineering (GBE) of Hastelloy-X. Multiple cold-rolling strain levels and annealing conditions are studied and it is observed that the density of ∑3 boundaries decreases proportionally to the amount of strain induced boundary migration (SIBM) during the GBE process. The dissociation mechanism of Σ3 annealing twins is activated at the onset of SIBM, causing an increase in the density of the Σ3n variants. It is shown that at high annealing times or temperatures, the rate of generation of CSL boundaries through dissociation mechanism is lower than their annihilation rate. It is further suggested that the dissociation mechanism of ∑3 boundaries during GB migration is more efficient when the amount of applied strain prior to annealing is kept low, thus promoting disruption of the random GB network.

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5

Wu, Guo Qing, Zi Yun Chen, Ming Huang, Yuan Qin, Alimjan Ablat, Han Lu Jiang i Sen Yang. "Evolution of Grain Boundary Character Distribution in Pure Copper during Low-Strain Thermomechanical Processing". Materials Science Forum 944 (styczeń 2019): 229–36. http://dx.doi.org/10.4028/www.scientific.net/msf.944.229.

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In order to get optimal grain boundary character distribution (GBCD) and grain boundary properties, thermomechanical processing (TMP) is usually adopted in grain boundary engineering. However, the mechanism behind the TMP treatments and GBCD optimization is still unclear. The present study has conducted a series experiments involving low-strain TMPs to study the relationship between TMP parameters and the behind microstructural evolution. The experimental results indicate that in the scope of low-strain TMP, strain induced boundary migration (SIBM) is the most effective process for GBCD optimization. Besides, SIBM and grain growth would gradually transfer to recrystallization with the increase of pre-deformation level and annealing temperature. Further quasi in-situ EBSD results infer that SBIM is activated locally in some region with high stored energy, and further gradual initiation of SIBM from one region to another contributes to the gradual increase of special boundaries with annealing time.

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6

Park, Jong Tae, i Kyu Seok Han. "Goss Texture Formation by Strain Induced Boundary Migration in Semi-Processed Nonoriented Electrical Steels". Materials Science Forum 715-716 (kwiecień 2012): 837–42. http://dx.doi.org/10.4028/www.scientific.net/msf.715-716.837.

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Semi-processed nonoriented electrical steels are very attractive products whose magnetic properties are significantly improved through annealing treatment in customers plant. The improvement is due to strong Goss texture formation by strain induced boundary migration (SIBM). In order to the effect of temper rolling reduction on the strengthening of Goss texture, temper rolling reduction was changed in the range of 2% to 8%. The annealing times was changed from 10 minutes to 180 minutes. A mechanism of grain growth during SIBM is suggested from our experimental data. In the specimen temper-rolled by 2%, relatively strong {111}<112> texture develops, whereas in the specimens temper-rolled by 4% through 8%, strong Goss texture develops as a result of SIBM during final annealing. It can be found from observed EBSD data that the Goss grains have the lowest stored energy in all temper-rolled specimens, which is confirmed by average image quality value in EBSD measurements. However, for the Goss grains to grow preferentially, stored energy difference between Goss grains and their neighboring grains may have to be higher than a certain critical value.

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7

Murakami, Kenichi, T. Kubota, Fabienne Grégori i Brigitte Bacroix. "The Effect of Dislocations in Grains on Texture Formation in Strain Induced Boundary Migration". Materials Science Forum 558-559 (październik 2007): 271–76. http://dx.doi.org/10.4028/www.scientific.net/msf.558-559.271.

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In order to elucidate the predominance of Goss grains after SIBM in electrical steel sheets, Goss, D-Cube and {111}<112> grains after temper rolling of 5 and 9% reduction were observed by TEM. In 5% strain the amount of dislocations in Goss grains was the smallest of the three orientations. In 9% strain dislocations in Goss grains were distributed more heterogeneously than the other two types of grains. It is considered that {111}<112> grains have large amounts of dislocations owing to high Taylor factors and the differences of microstructures between Goss and D-Cube grains are due to orientation stabilities. Goss grains are speculated to be easy to recover and therefore they are predominant after SIBM.

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8

Giordani, E. J., Alberto Moreira Jorge i O. Balancin. "Evidence of Strain-Induced Precipitation on a Nb- and N-Bearing Austenitic Stainless Steel Biomaterial". Materials Science Forum 500-501 (listopad 2005): 179–86. http://dx.doi.org/10.4028/www.scientific.net/msf.500-501.179.

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Pilot-scale plate rolling experiments and laboratory thermomechanical processing experiments were carried out to understand the mechanism of microstructural banding in low-carbon microalloyed steels. The microstructural banding originates with large elongated austenite grains, which are present at the roughing stage of rolling. The large austenite grains develop when conditions favour abnormal grain growth during reheat and/or strain induced grain boundary migration (SIBM) in the first few rolling passes. Microstructural banding is eliminated by designing TMP schedules to avoid abnormal grain growth and SIBM.

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9

Cai, S., i J. D. Boyd. "Mechanism of Microstructural Banding in Hot Rolled Microalloyed Steels". Materials Science Forum 500-501 (listopad 2005): 171–78. http://dx.doi.org/10.4028/www.scientific.net/msf.500-501.171.

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Pilot-scale plate rolling experiments and laboratory thermomechanical processing experiments were carried out to understand the mechanism of microstructural banding in low-carbon microalloyed steels. The microstructural banding originates with large elongated austenite grains, which are present at the roughing stage of rolling. The large austenite grains develop when conditions favour abnormal grain growth during reheat and/or strain induced grain boundary migration (SIBM) in the first few rolling passes. Microstructural banding is eliminated by designing TMP schedules to avoid abnormal grain growth and SIBM.

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10

INOKO, F., i M. KOBAYASHI. "STRAIN-INDUCED BOUNDARY MIGRATION (SIBM) IN ALUMINUM BICRYSTALS EACH WITH A <211> TILT BOUNDARY". Le Journal de Physique Colloques 49, nr C5 (październik 1988): C5–605—C5–610. http://dx.doi.org/10.1051/jphyscol:1988576.

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11

McCarley, Joshua, i Sammy Tin. "Utilization of hot deformation to trigger strain induced boundary migration (SIBM) in Ni-base superalloys". Materials Science and Engineering: A 720 (marzec 2018): 189–202. http://dx.doi.org/10.1016/j.msea.2018.02.062.

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12

Upmanyu, Moneesh, Zachary T. Trautt i Branden B. Kappes. "Anisotropy in Grain Boundary Thermo-Kinetics: Atomic-Scale Computer Simulations". Materials Science Forum 467-470 (październik 2004): 715–26. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.715.

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Anisotropy in grain boundary “thermo-kinetics” is central to our understanding of microstructural evolution during grain growth and recrystallization. This paper focusses on role of atomic-scale computer simulation techniques, in particular molecular dynamics (MD), in extracting fundamental grain boundary properties and elucidating the atomic-scale mechanisms that determine these properties. A brief overview of recent strides made in extraction of grain boundary mobility and energy is presented, with emphasis on plastic strain induced boundary motion (p-SIBM) during recrystallization and curvature driven boundary motion (CDBM) during grain growth. Simulations aimed at misorientation dependence of the grain boundary properties during p-SIBM and CDBM show that boundary mobility and energy exhibit extrema at high symmetry misorientations and boundary mobility is comparatively more anisotropic during CDBM. This suggests that boundary mobility is dependent on the driving force. Qualitative observations of the atomic-scale mechanisms in play during boundary motion corroborate the simulation data. p-SIBM is dominated by motion of dislocation-interaction induced stepped structure of the grain boundaries, while correlated shuffling of group of atoms preceded by rearrangement of grain boundary free volume due to single atomic-hops across the grain boundary is frequently observed during CDBM. Comparison of the simulation results with high-purity experimental data extracted in Al indicates that while there is excellent agreement in misorientation dependent anisotropic properties, there are significant differences in values of boundary mobility and migration activation enthalpy. This strongly suggests that minute concentration of impurities retard grain boundary kinetics via impurity drag. Finally, the paper briefly discusses current and future challenges facing the computer simulation community in studying grain boundary systems in real materials where extrinsic effects (vacancy, impurity, segregation and particle effects) significantly alter the microscopic structure-mechanism relations and play a decisive role in determining the boundary properties.

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13

Beucia, B., S. Queyreau, C. Kahloun, D. Chaubet, P. Franciosi i B. Bacroix. "Plastic strain-induced grain boundary migration (SIBM) in pure aluminum: SEM in-situ and AFM examinations". International Journal of Plasticity 115 (kwiecień 2019): 29–55. http://dx.doi.org/10.1016/j.ijplas.2018.11.007.

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14

Humphreys, John F. "Nucleation in Recrystallization". Materials Science Forum 467-470 (październik 2004): 107–16. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.107.

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The nucleation of recrystallization in deformed and annealed metals is reviewed. The main mechanisms are thought to involve the growth of subgrains by low angle boundary (LAGB) migration in an orientation gradient or the strain induced boundary migration (SIBM) of existing boundaries. Although these mechanisms are reasonably well understood, the details of the dislocation recovery mechanisms which are often required before migration can occur, particularly in metals in which recovery is slow, are poorly understood. Complete experimental investigation of the nucleation event requires a 3-d in-situ technique which will resolve dislocations, and this is not currently available. Although recrystallized grains of orientations not in the deformed structure have been reported, there is as yet no substantial evidence or theory to suggest the creation of new orientations by mechanisms other than annealing twinning. It is concluded that further understanding of the deformed state is required before adequate models of nucleation can be formulated and verified.

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15

Kashihara, K. "Effect of piled-up dislocations on strain induced boundary migration (SIBM) in deformed aluminum bicrystals with originally ∑3 twin boundary". Acta Materialia 49, nr 15 (3.09.2001): 3051–61. http://dx.doi.org/10.1016/s1359-6454(01)00211-7.

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16

McDonald, D. T., John F. Humphreys i Pete S. Bate. "Microstructure and Texture of Dynamically Recrystallized Copper and Copper – Tin Alloys". Materials Science Forum 550 (lipiec 2007): 393–98. http://dx.doi.org/10.4028/www.scientific.net/msf.550.393.

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The microstructure and texture in dynamically recrystallized copper and two copper – tin alloys (2wt% and 4.5wt% tin) has been investigated. Specimens were deformed in channel-die plane strain compression to true strains from 0.1 to 1.22 within the temperature range 200°C to 700°C, and the resulting microstructures were investigated with the use of high resolution electron backscatter diffraction (EBSD). Dynamic recrystallization was initiated by the bulging of preexisting high angle grain boundaries (HAGB), and occurred primarily by strain induced boundary migration (SIBM) and twinning. The addition of tin led to an increase in the temperature at which dynamic recrystallization initiated, and furthermore to a smaller dynamically recrystallized grain size. This was attributed to the effects of solute drag causing lower HAGB mobility. Dynamic recrystallization was observed to weaken the deformation texture components of brass and Goss, as well as introduce a cube texture component which generally tended to strengthen with temperature but weaken with increasing tin additions.

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17

Feng, Di, Xin Ming Zhang i Sheng Dan Liu. "Constitutive Equation and Dynamic Softening Behavior of 7A55 Aluminum Alloy during Compression at Elevated Temperatures". Materials Science Forum 898 (czerwiec 2017): 291–99. http://dx.doi.org/10.4028/www.scientific.net/msf.898.291.

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The hot deformation behaviors of 7A55 aluminum alloy were investigated by compression tests at temperatures ranging from 270°C to 450°C and strain rate ranging from 0.1s−1 to 25s−1. Tha rResults show that the flow stress increased with increasing strain rate and decreasing temperature. A two-stage constitutive equation was established and the hot deformation activation energy was 140 kJ/mol. EBSD observations show that the fine and equiaxed grains with the misorientation angle above 15° nucleated at the initial grain boundaries under high temperature and low strain rate conditions. It is concluded that the softening mechanism of 7A55 aluminum alloy is dynamic recovery (DRV), together with a partial dynamic recrystallization (DRX). The nucleation mechanism of DRX could be explained by the strain induced grain boundary migration (SIBM). The DRX softening model was established based on the dislocation density theory finally.

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18

Sharma, Nitin Kumar, i Shashank Shekhar. "New perspectives on twinning events during strain-induced grain boundary migration (SIBM) in iteratively processed 316L stainless steel". Journal of Materials Science 56, nr 1 (14.09.2020): 792–814. http://dx.doi.org/10.1007/s10853-020-05240-y.

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19

Fang, Xiao Ying, Hong Guo i Wei Guo Wang. "Features of Grain Boundary Character Distributions in a Austenitic Stainless Steel after Cold Rolling with Low Strain Followed by Single and Two-Step Annealing". Materials Science Forum 675-677 (luty 2011): 571–74. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.571.

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The grain boundary character distributions (GBCDs) of two 304-type austenitic stainless steel samples, which are cold rolled with the same thickness reduction of 6% and then subjected to different annealing treatments are examined by Electron back-scatter diffraction (EBSD) techniques. The results indicate that, after 6% cold rolling, the two-step annealing (900°C/1 h+1050°C/5 min, Sample B) resulted in a quite different GBCDs compared with that obtained by single-step annealing (1050°C/5 min, Sample A) regardless of nearly the same fractions of S3 boundaries developed in the two samples. It was evidenced that large-sized cluster of grains interfaced by S3n boundaries (S3n CG) emerged in sample B, in which there are moderate preferential grain orientation distribution and {111} grain boundary plane distributions. Further discussions highlighted that, in the case of two-step annealing, the first annealing at relatively low temperature (900°C) for short time (1h) contributes a lot to the final optimization of GBCD and strain induced preferential boundary migration (SIBM) accompanied by multiple twinning via the migration and interactions between mobile S3n boundaries, especially incoherent S3 boundaries, might be the responsible mechanisms.

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20

McDonald, D. T., John F. Humphreys i Pete S. Bate. "Nucleation and Texture Development during Dynamic Recrystallization of Copper". Materials Science Forum 495-497 (wrzesień 2005): 1195–200. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.1195.

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Dynamic recrystallization and texture development in polycrystalline copper have been investigated. Specimens were deformed in channel-die plane strain compression to true strains from 0.1 to 0.7 within the temperature range 200°C to 600°C, and the resulting microstructures were investigated with the use of high resolution electron backscatter diffraction (EBSD). Dynamic recrystallization in copper was initiated by the bulging of pre-existing high angle grain boundaries (HAGB), and occurred primarily by strain induced boundary migration (SIBM). Increasing misorientations from parent to dynamically recrystallizing grains indicated the occurrence of lattice rotations within the bulges, leading, in some cases to the formation of a HAGB behind the bulge. Discrimination between recrystallized and deformed components in material which had partially undergone dynamic recrystallization was carried out, followed by texture analysis. This revealed most of the recrystallized material to have orientations close to that of the deformed material, however, some remote orientations were observed which could not be related to the deformation texture by twin or 40° <111> relationships.

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21

Yuan, Ting, Mingming Zuo, Zhipeng Yuan, Jingzhen Wang, Zili Liu, Quancheng Zhang i Yiyou Tu. "The Effect of Microstructural Evolution on the Brazeability of Two-Layer Al Sheets". Crystals 12, nr 10 (29.09.2022): 1387. http://dx.doi.org/10.3390/cryst12101387.

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In this study, the microstructural evolution and the interaction between the clad and the core alloys that occurs during the brazing process of two-layer Al sheets with equiaxed grains were examined. The study was carried out using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron backscatter diffraction (EBSD) and glow discharge optical emission spectrometry (GDOES). The effects of microstructure on the brazing performances of two-layer sheets were clarified. Although the grains were fine and equiaxed before brazing, three typical microstructural evolutions happened during brazing, corresponding to three kinds of interactions between the clad and core alloys of the aluminum brazing sheets. In the alloys, which had either relatively uniform grain growth or no grain growth, the interaction between the clad alloy and the core alloy was weak; accordingly, they showed a smooth surface, an even microstructure, faint element mutual diffusion, and eventually good brazeability. Meanwhile, in the alloy with obvious abnormal grain growth (AGG), strain-induced liquid-film migration (SILFM) occurred when the energy was too low to cause strain-induced boundary migration (SIBM). This led to rough and uneven surface morphology, significant mutual diffusion, and surface segregation of elements; eventually, this produced the worst brazeability.

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22

Bae, M., i H. B. Larsen. "Observation of Strain Induced Boundary Migration (SIBM) in a High-N Austenitic Stainless Steel / Betrachtung einer dehnungsinduzierten Korngrenzenwanderung in N-reichem austenitischen rostfreien Stahl". Practical Metallography 39, nr 4 (1.04.2002): 187–92. http://dx.doi.org/10.1515/pm-2002-390403.

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23

Chaturvedi, M. C., R. K. Verma i A. K. Jena. "Strain induced grain boundary migration in boron doped Ni76AI24". Materials Science and Technology 14, nr 8 (sierpień 1998): 743–46. http://dx.doi.org/10.1179/mst.1998.14.8.743.

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24

Yang, Xinye, Peng Wang i Ming Huang. "Grain boundary evolution during low-strain grain boundary engineering achieved by strain-induced boundary migration in pure copper". Materials Science and Engineering: A 833 (styczeń 2022): 142532. http://dx.doi.org/10.1016/j.msea.2021.142532.

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Ji, Feng Qin. "Dynamic Strain - Induced Boundary Migration during Dynamic Recovery at a High Temperature Deformation with a Lower Strain Rate". Advanced Materials Research 887-888 (luty 2014): 395–99. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.395.

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Conventional hot compression deformation and water quenching experiments were applied to investigate the evolution of austenite grain structures before the initiation of dynamic recrystallization. The experimental results reveal an interesting phenomenon that dynamic strain induced boundary migration can lower dislocation density and coarsen austenite grains. The results show that dynamic recovery is not the only way to decrease dislocation density, the mechanism of which for dynamic recovery is related to dislocations climb and annihilation, resulting in the formation of sub-grains and regular sub-boundaries. However, the mechanism of decreasing dislocation density for dynamic strain induced boundary migration is different from dynamic recovery. Therefore, dynamic strain induced boundary migration should be another softening mechanism before the initiation of dynamic recrystallization.

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26

Trusov, P. V., N. S. Kondratev i A. Yu Yanz. "A Model for Static Recrystallization through Strain-Induced Boundary Migration". Physical Mesomechanics 23, nr 2 (marzec 2020): 97–108. http://dx.doi.org/10.1134/s1029959920020010.

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Yogo, Yasuhiro, Hirohisa Takeuchi, Takashi Ishikawa, Noritoshi Iwata i Koukichi Nakanishi. "Strain-induced boundary migration of carbon steel at high temperatures". Scripta Materialia 61, nr 11 (grudzień 2009): 1001–3. http://dx.doi.org/10.1016/j.scriptamat.2009.08.003.

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Yoo, Cha-Young, Sang-Chul Han i Duk-Yong Yoon. "The grain boundary migration in Ag induced by thermal strain". Metallurgical and Materials Transactions A 26, nr 11 (listopad 1995): 3048–49. http://dx.doi.org/10.1007/bf02669662.

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Kim, Se Jong, Yi Gil Cho, Dong Woo Suh, Sung Joon Kim, Gyo Sung Kim i Heung Nam Han. "Boundary Migration Induced Plasticity during Recrystallization and Growth under Applied Stress". Materials Science Forum 558-559 (październik 2007): 533–37. http://dx.doi.org/10.4028/www.scientific.net/msf.558-559.533.

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In general, plastic strain occurs over a certain stress, called yield stress. However, it has been reported that the permanent strain could happen during boundary migrating even under the extremely slight externally applied stress. In this study, we performed dilatometry experiments under the various compressive stresses and measured the amount of recrystallization and growth induced permanent strain. A new empirical constitutive equation was suggested to describe the recrystallization and growth induced plasticity. This equation was verified by comparing the calculated values with dilatometric experimental data under the various compressive stresses.

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30

Mukherjee, Deepjyoti, Henrik Larsson i Joakim Odqvist. "Simulating Diffusion Induced Grain Boundary Migration in Binary Fe–Zn". Metals 12, nr 10 (29.09.2022): 1632. http://dx.doi.org/10.3390/met12101632.

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A recently developed phase-field model for simulating diffusion-induced grain boundary migration (DIGM) is applied to binary Fe–Zn. The driving force for the boundary migration is assumed to come from the coherency strain energy mechanism suggested by Sulonen. The effect of the angle of the grain boundary with the surface on the velocity of the boundary migration is studied in detail. The simulation results compare favorably with experimental observations, such as the oscillatory motion of the grain boundary, velocity of the moving grain boundary during DIGM, and the maximum value of mole fraction of Zn at the surface after 20 h of heat treatment.

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Li, Kai, Yao Shen, Da Yong Li i Ying Hong Peng. "Phase Field Study of Second Phase Particles-Pinning on Strain Induced Grain Boundary Migration". Materials Science Forum 993 (maj 2020): 967–75. http://dx.doi.org/10.4028/www.scientific.net/msf.993.967.

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A phase field model was presented to investigate the effect of particles-pinning on grain boundary migration in materials containing stored energy differences across the grain boundaries. The accuracy of the phase field framework was examined by comparing the simulated results with theoretical predictions. The pinning effects of coherent and non-coherent second phase particles on the boundary migration were studied in triple-grain models. 2D simulations with second phase particles of different sizes or different area fractions were performed. The effect of stored energy difference across the boundary on the particles-pinning was also investigated. The results showed that the pinning effect could be enhanced by the decrement of the particle size and the increment of particle area fraction. Increasing the stored energy difference across the grain boundary induced higher grain boundary migration velocity and weaker particles-pinning.

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Cao, Z. H., i X. K. Meng. "Anomalous Strain Rate Sensitivity of Nanocrystalline Ni Induced by Rolling Deformation". Materials Science Forum 816 (kwiecień 2015): 143–46. http://dx.doi.org/10.4028/www.scientific.net/msf.816.143.

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The strain rate sensitivity of rolled nanocrystalline (NC) Ni was studied by nanoindentation. The grain continuously grows from 20 nm to 92 nm after rolling deformation. The stress driven grain boundary migration accompanied by dislocation emission leads to the grain growth. The strain sensitivity first increase and then decrease with the increased rolling strain, which has a similar variation of dislocation density in rolled NC Ni. The remarkable shift of rate sensitivity is attributed to the dislocation supported grain boundary mediated process.

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Montheillet, Frank. "Influence of Boundary Migration Induced Softening on the Steady State of Discontinuous Dynamic Recrystallization". Materials 14, nr 13 (24.06.2021): 3531. http://dx.doi.org/10.3390/ma14133531.

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During discontinuous dynamic recrystallization (DDRX), new dislocation-free grains progressively replace the initially strain-hardened grains. Furthermore, the grain boundary migration associated with dislocation elimination partially opposes strain hardening, thus adding up to dynamic recovery. This effect, referred to as boundary migration induced softening (BMIS) is generally not accounted for by DDRX models, in particular by “mean-field” approaches. In this paper, BMIS is first defined and then analyzed in detail. The basic equations of a grain scale DDRX model, involving the classical Yoshie–Laasraoui–Jonas equation for strain hardening and dynamic recovery and including BMIS are described. A steady state condition equation is then used to derive the average dislocation density and the average grain size. It is then possible to assess the respective influences of BMIS and dynamic recovery on the strain rate sensitivity, the apparent activation energy, and the relationship between flow stress and average grain size (“Derby exponent”) of the material during steady state DDRX. Finally, the possible influence of BMIS on the estimation of grain boundary mobility and nucleation rate from experimental data is addressed.

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Shao, Guangshuai, Yuhui Sha, Xi Chen, Songtao Chang, Fang Zhang i Liang Zuo. "Characterization and Calculation of the Dynamic Recrystallization Texture in Fe-3.0 Wt.% Si Alloy". Materials 15, nr 2 (10.01.2022): 517. http://dx.doi.org/10.3390/ma15020517.

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High-temperature plane-strain compression tests were performed on Fe-3.0 wt.% Si alloy from 900 °C to 1150 °C at strain rates of 5 s−1 to 1 s−1, and the texture development from different initial textures was investigated by means of electron backscattered diffraction. Dynamic recrystallization occurs by strain-induced boundary migration, and the evolutions of the microstructure and different texture components vary with the initial texture. The critical orientation boundary separating the weakened and enhanced texture components moves with the initial texture, and a quantitative relationship is established to represent the dependence of the critical Taylor factor on the instantaneous texture. A model is proposed to describe the dynamic recrystallization texture by incorporating the oriented nucleation probability with a variable critical Taylor factor. The present work could improve the accuracy of hot deformation texture prediction based on strain-induced boundary migration.

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Shao, Guangshuai, Xi Chen, Yuhui Sha, Fang Zhang, Zhenghua He i Liang Zuo. "Texture Evolution by Strain-Induced Boundary Migration during Hot Deformation of Fe-3.0 wt.% Si Alloy: Experiment and Modeling". Metals 12, nr 2 (20.02.2022): 360. http://dx.doi.org/10.3390/met12020360.

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Texture and microstructure evolution during high-temperature plane-strain compression in Fe-3.0 wt.% Si alloy has been investigated by micro-texture analysis and modeling. In this study, hot deformation test is performed on the temperature range of 900 °C~1150 °C with a strain rate scope of 0.01 s−1~5 s−1, and the effect of deformation parameters is investigated by means of electron backscattered diffraction. Nucleation and growth assisted by strain-induced boundary migration result in strong {001}<110> and {001}<210> texture components with low Taylor factors, and the grain size of λ fiber increases significantly by consuming the {111}<110> and {111}<112> texture components with high Taylor factors. The critical Taylor factor above which nucleation by strain-induced boundary migration cannot occur, decreases continuously during hot deformation. With the decreasing critical Taylor factor, the increment rate of low-Taylor-factor orientation depends more sensitively on Taylor factor than the decrement rate of high-Taylor-factor orientation. The boundary separating enhanced and weakened orientations moves towards lower Taylor factor with the deformation proceeding, and medium-Taylor-factor texture components may experience a reversed change from enhancement to weakness. A quantitative model is proposed to describe texture development by incorporating the oriented nucleation probability dependent on a variable critical Taylor factor and the selective growth driven by a variable Taylor factor difference between adjacent grains. The present work can provide an efficient method for optimizing hot deformation texture by means of strain-induced boundary migration.

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Ji, M., C. Davis i C. Slater. "Retaining {100} fibre texture in electrical steel via strain-induced boundary migration recrystallisation." Journal of Physics: Conference Series 1270 (sierpień 2019): 012009. http://dx.doi.org/10.1088/1742-6596/1270/1/012009.

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Rhee, Won-Hyuk, i Duk N. Yoon. "The grain boundary migration induced by diffusional coherency strain in MoNi alloy". Acta Metallurgica 37, nr 1 (styczeń 1989): 221–28. http://dx.doi.org/10.1016/0001-6160(89)90280-0.

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Bozzolo, Nathalie, Andrea Agnoli, Nadia Souaï, Marc Bernacki i Roland E. Logé. "Strain Induced Abnormal Grain Growth in Nickel Base Superalloys". Materials Science Forum 753 (marzec 2013): 321–24. http://dx.doi.org/10.4028/www.scientific.net/msf.753.321.

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Under certain circumstances abnormal grain growth occurs in Nickel base superalloys during thermomechanical forming. Second phase particles are involved in the phenomenon, since they obviously do not hinder the motion of some boundaries, but the key parameter is here the stored energy difference between adjacent grains. It induces an additional driving force for grain boundary migration that may be large enough to overcome the Zener pinning pressure. In addition, the abnormal grains have a high density of twins, which is likely due to the increased growth rate.

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39

Lillo, T. M., S. A. Hackney i M. R. Plichta. "On the origins of ghost boundaries during in situ strain-induced grain-boundary migration". Ultramicroscopy 37, nr 1-4 (sierpień 1991): 294–309. http://dx.doi.org/10.1016/0304-3991(91)90027-4.

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Kestens, L. A. I., T. Nguyen-Minh, J. Ochoa Avendaño, H. Ghiabakloo i A. Van Bael. "Topological aspects of mean-field crystallographically resolved models". IOP Conference Series: Materials Science and Engineering 1249, nr 1 (1.07.2022): 012009. http://dx.doi.org/10.1088/1757-899x/1249/1/012009.

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Abstract It is well-known that the crystallographic texture of a polycrystalline aggregate can be represented by the Orientation Distribution Function (ODF). A similar statistical approach can be extended to other microstructural state variables that are of relevance in the context of obtaining microstructurally based and quantitatively accurate structure-properties relations. In principle such statistical representations are of a non-topological nature, in contrast to an RVE (Representative Volume Element) description of the microstructure. However, by including additional variables to the statistical descriptor specific features of the topology may be taken into account. In this paper the example will be shown on how the plastic anisotropy simulation of a conventional deep drawing grade of Interstitial Free (IF) steel can be improved by considering the crystallographic misorientation of pairs of neighboring crystals, which represent the basic structural units of the 2-point mean field ALAMEL crystal plasticity model. In another example it will be shown how the recrystallization texture of the same deep drawing IF steel can be modelled with improved accuracy if the Strain Induced Boundary Mechanism (SIBM) is taken into account whereby a crystal orientation of low stored energy grows into a neighboring orientation of high stored energy.

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Inoko, Fukuji, Minoru Kobayashi i Shiro Kawaguchi. "Formation of Recrystallized Grains due to Strain Induced Boundary Migration in Aluminum Bicrystals with ⟨211⟩ Tilt Boundary". Journal of the Japan Institute of Metals 51, nr 12 (1987): 1108–15. http://dx.doi.org/10.2320/jinstmet1952.51.12_1108.

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Pinto, Andre Luiz, Carlos Sergio da Costa Viana i Luiz Henrique de Almeida. "Micromechanisms Involved in Grain Boundary Engineering". Materials Science Forum 495-497 (wrzesień 2005): 1225–30. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.1225.

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Grain boundary engineering has been applied to different materials in order to increase properties particularly sensitive to intergranular phenomena. This work analyses the micromechanisms that allow the control of the amount of special boundaries which respect coincidence site lattice theory. α-brass, a lead alloy, Inconel 625 and Inconel 600 were submitted to different thermomechanical treatments and were analyzed via electron backscatter diffraction in order to characterize their grain boundaries. The occurrence of thin twins in some crystal directions during the deformation step seems to determine the results obtained as well as strain induced boundary migration.

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KASHIHARA, Keizo, Hiroshi TANAKA, Minoru TAGAMI, Tatsuya OKADA i Fukuji INOKO. "Relationship between interaction of piled-up dislocations and strain induced boundary migration in pure aluminum bicrystals." Journal of Japan Institute of Light Metals 52, nr 3 (2002): 101–7. http://dx.doi.org/10.2464/jilm.52.101.

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Chaturvedi, M. C., R. K. Verma i A. K. Jena. "Strain induced grain boundary migration in boron doped Ni₇₆AI₂₄". Materials Science and Technology 14, nr 8 (1.08.1998): 743–46. http://dx.doi.org/10.1179/026708398790301089.

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Zhang, Y. Y., i J. S. Zhang. "Recrystallization in the particles interfacial region of the cold-sprayed aluminum coating: Strain-induced boundary migration". Materials Letters 65, nr 12 (czerwiec 2011): 1856–58. http://dx.doi.org/10.1016/j.matlet.2011.04.014.

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Jafari, M., M. Jamshidian, S. Ziaei-Rad, D. Raabe i F. Roters. "Constitutive modeling of strain induced grain boundary migration via coupling crystal plasticity and phase-field methods". International Journal of Plasticity 99 (grudzień 2017): 19–42. http://dx.doi.org/10.1016/j.ijplas.2017.08.004.

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Duval, Paul, Laurent Arnaud, Olivier Brissaud, Maureen Montagnat i Sophie de la Chapelle. "Deformation and recrystallization processes of ice from polar ice sheets". Annals of Glaciology 30 (2000): 83–87. http://dx.doi.org/10.3189/172756400781820688.

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AbstractInformation on deformation modes, fabric development and recrystallization processes was obtained by study of deep ice cores from polar ice sheets. It is shown that intracrystalline slip is the main deformation mechanism in polar ice sheets. Grain-boundary sliding does not appear to be a significant deformation mode. Special emphasis was laid on the occurrence of "laboratory" tertiary creep in ice sheets. The creep behavior is directly related to recrystallization processes. Grain-boundary migration associated with grain growth and rotation recrystallization accommodates dislocation slip and counteracts strain hardening. The fabric pattern is similar to that induced only by slip, even if rotation recrystallization slows down fabric development. Fabrics which develop during tertiary creep, and are associated with migration recrystallization, are typical recrystallization fabrics. They are associated with the fast boundary migration regime as observed in temperate glaciers. A decrease of the stress exponent is expected from 3, when migration recrystallization occurs, to a value ≤ 2 when normal grain growth occurs.

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Gautam, Jai, Roumen H. Petrov, Elke Leunis i Leo Kestens. "Strain Induced Inward Grain Growth during Recrystallisation in Steel Sheets with BCC Crystal Structure". Materials Science Forum 715-716 (kwiecień 2012): 303–8. http://dx.doi.org/10.4028/www.scientific.net/msf.715-716.303.

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The present paper investigates the potential application of Strain Induced Boundary Migration mechanism on the two different types of surface textures developed after α-γ-α phase transformation annealing, one with preferred cube and Goss orientation at the surface and the other with random surface texture without preferred orientations. It has been demonstrated that these surface texture components grow in across the thickness of the sheet after an appropriate combinations of a critical amount of rolling reductions and an annealing treatment at the recrystallisation temperature.

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Kashihara, Keizo, Haruyuki Konishi i Toshiya Shibayanagi. "Strain-induced grain boundary migration in {112} 〈111〉/{100} 〈001〉 and {123} 〈634〉/{100} 〈001〉 aluminum bicrystals". Materials Science and Engineering: A 528, nr 29-30 (listopad 2011): 8443–50. http://dx.doi.org/10.1016/j.msea.2011.08.020.

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Wheeler, John, E. Mariani, S. Piazolo, D. J. Prior, P. J. Trimby, M. R. Drury, D. McNamara i M. A. Pearce. "Quantitative Analysis of EBSD Data in Rocks and other Crystalline Materials: Investigation of Strain Induced Recrystallisation and Growth of New Phases". Materials Science Forum 715-716 (kwiecień 2012): 62–71. http://dx.doi.org/10.4028/www.scientific.net/msf.715-716.62.

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Misorientation can be calculated over large datasets and a theme of this paper is the usefulness of examining the results statistically. Comparing the statistics of misorientations calculated from neighbouring pixels (or grains) with those calculated from pairs of pixels (or grains) selected at random helps to indicate deformation and recrystallisation mechanisms. Taking boundary length into account provides a link to grain boundary energy, and boundary length versus misorientation data should be used to examine how boundaries with different misorientations evolve through time. Time lapse misorientation maps indicate how orientation changes through time at particular points in a microstructure during in situ experiments. The size of areas which have changed orientation by particular amounts can be linked to boundary length and boundary migration velocities. When dealing with different phases, the statistics of angular relationships, akin to intraphase misorientation analysis, can indicate orientation relationships in the absence of prior knowledge, which is advantageous in investigating the plethora of minerals that make up the Earth.

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