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Добірка наукової літератури з теми "Planar Fault Energies"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Planar Fault Energies"

1

Eggeler, Y. M., K. V. Vamsi, and T. M. Pollock. "Precipitate Shearing, Fault Energies, and Solute Segregation to Planar Faults in Ni-, CoNi-, and Co-Base Superalloys." Annual Review of Materials Research 51, no. 1 (July 26, 2021): 209–40. http://dx.doi.org/10.1146/annurev-matsci-102419-011433.

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Анотація:
The mechanical properties of superalloys are strongly governed by the resistance to shearing of ordered precipitates by dislocations. In the operating environments of superalloys, the stresses and temperatures present during thermomechanical loading influence the dislocation shearing dynamics, which involve diffusion and segregation processes that result in a diverse array of planar defects in the ordered L12 γ′ precipitate phase. This review discusses the current understanding of high-temperature deformation mechanisms of γ′ precipitates in two-phase Ni-, Co-, and CoNi-base superalloys. The sensitivity of planar fault energies to chemical composition results in a variety of unique deformation mechanisms, and methods to determine fault energies are therefore reviewed. The degree of chemical segregation in the vicinity of planar defects reveals an apparent phase transformation within the parent γ′ phase. The kinetics of segregation to linear and planar defects play a significant role in high-temperature properties. Understanding and controlling fault energies and the associated dislocation dynamics provide a new pathway for the design of superalloys with exceptional properties.
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2

Woodward, C., J. M. MacLaren, and S. Rao. "Electronic structure of planar faults in TiAl." Journal of Materials Research 7, no. 7 (July 1992): 1735–50. http://dx.doi.org/10.1557/jmr.1992.1735.

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The mechanical behavior of intermetallic alloys is related to the mobility of the dislocations found in these compounds. Currently the effect of bonding on dislocation core structure and its influence on deformation behavior is not well understood. However, the unusual properties of these materials, such as the anomalous temperature dependence of flow stress observed in TiAl, are derived in part from the aspects of bonding that determine dislocation mobility. Several recent studies have suggested a particular relationship between directional bonding in TiAl and dislocation mobility. To understand better the flow behavior of high temperature intermetallics, and as a step toward bridging the gap between electronic structure and flow behavior, we have calculated the electronic structure of various planar faults in TiAl. The self consistent electronic structure has been determined using a layered Korringa Kohn Rostoker (LKKR) method which embeds the fault region between two semi-infinite perfect crystals. Calculated defect energies in stoichiometric TiAl agree reasonably well with other theoretical estimates, though overestimating the experimental (111) anti-phase boundary (APB) energy, found for Ti46Al54. We approximate the energy of the (111) APB for the Al-rich stoichiometry by calculating the energy of Al antisites near that defect plane. The calculated (111)APB energy decreases by 6% in going from stoichiometric TiAl to Ti46Al54. The overall hierarchy of fault energies is found to be associated with the number of crystal bond states that are disrupted by the introduction of the fault plane. However, the hierarchy of fault energies is inconsistent with the traditionally accepted ordering. Changes in bonding taking place in the vicinity of the planar defects are illustrated through the density of states and charge density plots. A three body atomistic model is introduced to parameterize the bonding observed in TiAl. The L10 lattice (c/a = 1.00), within a second nearest neighbor three body model, yields a (111)APB energy which is the sum of the complex and superlattice-intrinsic stacking fault energies.
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3

Jagatramka, Ritesh, Junaid Ahmed, and Matthew Daly. "The evolution of deformation twinning microstructures in random face-centered cubic solid solutions." Journal of Applied Physics 133, no. 5 (February 7, 2023): 055107. http://dx.doi.org/10.1063/5.0135538.

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The varied atomic arrangements in face-centered cubic (FCC) solid solutions introduce atomic-scale fluctuations to their energy landscapes that influence the operation of dislocation-mediated deformation mechanisms. These effects are particularly pronounced in concentrated systems, which are of considerable interest to the community. Here, we examine the effect of local fluctuations in planar fault energies on the evolution of deformation twinning microstructures in randomly arranged FCC solid solutions. Our approach leverages the kinetic Monte Carlo (kMC) method to provide kinetically weighted predictions for competition between two processes: deformation twin nucleation and deformation twin thickening. The kinetic barriers underpinning each process are drawn from the statistics of planar fault energies, which are locally sampled using molecular statics methods. kMC results show an increase in the fault number densities of solid solutions relative to a homogenized reference, which is found to be driven by the fluctuations in planar fault energies. Based on kMC relations, an effective barrier model is derived to predict the competition between deformation twinning nucleation and thickening processes under a fluctuating planar fault energy landscape. A key result from this model is a measurement of the length-scale over which the influence of local fluctuations in planar fault energies diminish and nucleation/thickening-dominated behaviors converge to bulk predictions. More broadly, the tools developed in this study enable examination of the influence of chemistry and length-scale on the evolution of deformation twinning mechanisms in FCC solid solutions.
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4

Farkas, Diana, and Christophe Vailhe. "Planar fault energies and dislocation core spreading in B2 NiAl." Journal of Materials Research 8, no. 12 (December 1993): 3050–58. http://dx.doi.org/10.1557/jmr.1993.3050.

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We present computer simulation results for the planar faults involved in core spreading of 〈100〉 and 〈111〉 dislocations. Seven γ surfaces were computed for different crystallographic planes ({110}, {112}, {123}, {210}, {100}, {111}, and {122}). Stable APB's are observed in the {110} and {112} planes, but they are deviated from the exact 1/2a〈111〉 position. No other stable planar fault was observed. The fact that a stable minimum is observed deviated from the 1/2〈111〉 position suggests the possibility of different dissociation reactions for the 〈111〉 screw dislocation in the {110} and {112} planes. The fact that no other stable minima were observed in the γ surfaces indicates that no true core dissociation is expected for the 〈100〉 dislocations. We propose that dislocation core spreading in various planes can be understood in terms of the directions of lowest restoring forces observed for the corresponding γ surfaces.
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5

Liu, Lili, Liwan Chen, Youchang Jiang, Chenglin He, Gang Xu, and Yufeng Wen. "Temperature Effects on the Elastic Constants, Stacking Fault Energy and Twinnability of Ni3Si and Ni3Ge: A First-Principles Study." Crystals 8, no. 9 (September 14, 2018): 364. http://dx.doi.org/10.3390/cryst8090364.

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The volume versus temperature relations for Ni 3 Si and Ni 3 Ge are obtained by using the first principles calculations combined with the quasiharmonic approach. Based on the equilibrium volumes at temperature T, the temperature dependence of the elastic constants, generalized stacking fault energies and generalized planar fault energies of Ni 3 Si and Ni 3 Ge are investigated by first principles calculations. The elastic constants, antiphase boundary energies, complex stacking fault energies, superlattice intrinsic stacking fault energies and twinning energy decrease with increasing temperature. The twinnability of Ni 3 Si and Ni 3 Ge are examined using the twinnability criteria. It is found that their twinnability decrease with increasing temperature. Furthermore, Ni 3 Si has better twinnability than Ni 3 Ge at different temperatures.
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6

Wiezorek, J. M. K., and C. J. Humphreys. "On the hierarchy of planar fault energies in TiAl." Scripta Metallurgica et Materialia 33, no. 3 (August 1995): 451–58. http://dx.doi.org/10.1016/0956-716x(95)00212-e.

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7

Liu, Lili, Yelu He, Dingxing Liu, Xiaozhi Wu, and Rui Wang. "Temperature-Dependent Generalized Planar Fault Energy and Twinnability of Mg Microalloyed with Er, Ho, Dy, Tb, and Gd: First-Principles Study." Advances in Materials Science and Engineering 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/7365906.

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The generalized planar fault energies, Rice criterion ductility, and twinnability of pure Mg and Mg-RE (RE = Er, Ho, Dy, Tb, and Gd) alloys at different temperature have been investigated using density functional theory. It is shown that all the fault energies and twinnability in the same materials decrease with increasing temperature. However, the ductility has the opposite change trend. On the other hand, alloying rare earth elements will generally decrease the fault energies and increase the ductility and twinnability of Mg at different temperature. It is interesting to note that alloying larger atomic radius will enhance the ductility of Mg more easily and alloying smaller radius will make twinning tendency of Mg more easily. Finally, the electron structure further reveals the underlying mechanisms for the reduction of fault energies with the addition of rare earth elements.
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8

Kibey, S., J. B. Liu, D. D. Johnson, and H. Sehitoglu. "Generalized planar fault energies and twinning in Cu–Al alloys." Applied Physics Letters 89, no. 19 (November 6, 2006): 191911. http://dx.doi.org/10.1063/1.2387133.

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9

Zhu, Yaxin, Zhouqi Zheng, Minsheng Huang, Shuang Liang, and Zhenhuan Li. "Modeling of solute hydrogen effect on various planar fault energies." International Journal of Hydrogen Energy 45, no. 15 (March 2020): 9162–73. http://dx.doi.org/10.1016/j.ijhydene.2020.01.107.

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10

Wen, Y. F., and J. Sun. "Generalized planar fault energies and mechanical twinning in gamma TiAl alloys." Scripta Materialia 68, no. 9 (May 2013): 759–62. http://dx.doi.org/10.1016/j.scriptamat.2012.12.032.

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Більше джерел

Дисертації з теми "Planar Fault Energies"

1

Vailhé, Christophe N. P. "Planar fault energies and dislocation core spreadings in B2 NiAl." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/46303.

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Анотація:
The lack of ductility of the B2 NiAl alloy stands in the way of promising applications. In an effort to understand the dislocation behavior, computer simulation of the planar faults involved in the core spreadings of <100> and <111> dislocations was carried out. Seven γ-surfaces were computed for different crystallographic planes ({110}, {112}, {123}, {210}, {100}, {111} and {122}). Stable APB's are observed in the {110} and {112} planes but they are deviated from the exact 1/2a<111> position. No other stable planar fault was observed. The dislocation core spreadings are explained by the energy balance among the directions of lowest restoring forces observed in the γ-surfaces. The complete <111> screw dislocation was stable in the simulation. According to the stable APB's, two dissociation reactions of the <111> screw dislocation in the {110} and {112} planes are proposed. The simulation of metastable superpartials shows that the dissociation in the {112} planes is very close to a stable dissociation.
Master of Science
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2

Vailhe, Christophe N. P. "Planar fault energies and dislocation core spreadings in B2 NiAl /." This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12172008-063647/.

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3

Pereira, Vilson Souza. "Analise de vibrações de placas finas em medias e altas frequencias usando metodos de energia." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263264.

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Анотація:
Orientador: Jose Maria Campos dos Santos
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-08-13T03:19:31Z (GMT). No. of bitstreams: 1 Pereira_VilsonSouza_D.pdf: 15312128 bytes, checksum: 5088568f96c3f1f11b8524e51375c770 (MD5) Previous issue date: 2009
Resumo: Neste trabalho, estudam-se os fenômenos de propagação de ondas elásticas em placas simples e acopladas e se propõe unia metodologia para análise do comportamento vibracional médio cm frequência-espaço com o objetivo de identificar como as vibrações se propagam através dessas estruturas em médias e altas freqüências. Para isso utilizou-se de métodos de energia originados da Análise de Fluxo de Energia (EFA) e que têm como variáveis primárias a densidade de energia e fluxo de energia. Duas formulações foram usadas para resolver as equações diferenciais de energia aproximada derivada du EFA: o Método dos Elementos Finitos de Energia (EFEM) e o Método do Elemento Espectral de Energia (ESEM). O Método do Elemento Espectral (SEM) foi uma outra formulação estudada para resolver as equações diferenciais de propagação de onda em placa fina, bem como para validar a metodologia proposta. Diferentes tipos de acoplamentos foram investigados e implementados tais como: placa-placa, placa com reforço e placa com dano. Para isso, desenvolveram-se relações de acoplamentos que descrevem essas descontinuidades estruturais. Uma investigação experimental do comportamento vibracional de uma placa simples e com reforço foi realizada para verificar os resultados do ESEM. De forma geral, observa-se que os resultados obtidos pelos modelos simulados apresentaram um comportamento semelhante aos resultados encontrados experimentalmente
Abstract: In this research, propagation phenomena of elastic waves to simple and coupled plates are investigated and a methodology, based on energy methods, is proposed to predict the space- and frequency-averaged vibrational response of these structures, at mid and high frequencies. These methods, originated from Energy Flow Analysis, use as primary variables the energy density and the energy flow, which are parameters to vibrational analysis. Two methodologies are used to solve approximated energy differential equations derived from EFA: Energy Finite Element Method (EFEM) and Energy Spectral Element Method (ESEM). Another formulation the Spectral Element Method (SEM), is used to solve differential wave equation of thin plates in terms of displacement, based on classical mechanics; moreover this method is applied to validate the proposed methodology. Different discontinued structures were investigated, such as plate-plate, reinforced plate and damaged plate. To this purpose, coupled relationships that represent these discontinuities are developed. An experimental investigation of vibrational response of a simple and reinforced plate was performed to verify the results of ESEM. The experimental results, calculated in terms of energy variables, to both analyzed structures, showed a good agreement with the simulated models
Doutorado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
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4

Heczko, Martin. "Počítačové modelování hranic dvojčatění ve slitinách s tvarovou pamětí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416633.

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This Master‘s thesis is focused on theoretical study of twinning in magnetic shape memory alloys based on Ni2MnGa using ab initio calculations of electronic structure within the projector augmented wave method. In particular, the effect of increasing concentration of manganese at the expense of gallium was studied on total energy and stress profiles along different deformation paths in the (10-1)[101] shear system of non-modulated martensite. Further, this work deals with the effect of the concentration of manganese on the energy of planar fault caused by presence of partial dislocation due to motion of twin boundary. The results show that the shear modulus in studied shear system increases with the increasing concentration of manganese as well as energy barrier and deformation characteristics along shear deformation paths increases, which makes the shear more difficult in Mn-rich alloys. Increasing concentration of manganese also leads to rising the planar fault energy. All these effects can be responsible for lower mobility of twin boundaries in alloys with higher concentration of manganese.
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5

Vamsi, Koruprolu Venkata. "Planar Fault Energies in L12 Compounds." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4254.

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Анотація:
High temperature metallic structural materials, such as Ni-base superalloys owe their strength to a two-phase microstructure consisting of an fcc matrix strengthened by intermetallic A3B type precipitates. The performance of these alloys derives from the exceptional high temperature strength of the L12-ordered A3B precipitate, which in turn is strongly influenced by planar faults created when the precipitate is sheared. In this context, the broad goal of this work is to understand the role of composition on planar fault energies in A3B compounds with L12 structure. Towards this aim, electronic structure calculations using density functional theory (DFT) was used to evaluate fault energies through direct simulations of faults and though indirect means involving analytical models. In the first part of the thesis, the effect of composition on the planar fault energies, elastic anisotropy, deformation modes and yield strength anomaly were explored in five pseudo-binaries (Ni, Co)3(Al,X) compositions of γ' (L12), where X = Ti, Ta, W, Ni. It was observed fault energies and deformation modes are sensitive to composition. The results are in good agreement with literature and can provide explanations for the deformation behaviour of both (Ni)3(Al, X) and Co3(Al,W). Though the results are encouraging, the above DFT calculations of fault energies are time-consuming, highlighting the need for high throughput models. In the second part of the thesis, such a model was developed to estimate these energies in well-known and novel A3B compositions. The new model treats the planar fault as a diffuse interface and allows estimation of fault energy in terms of energy of geometrically close packed structures with the same A3B composition and a bonding environment akin to that of the fault. The proposed model was used to predict energies of different superlattice faults in over 40 A3B compounds. The model was found to be highly accurate even without use of fitting parameters and has a fifteen-fold computational advantage over direct simulation. The model was extended to novel A3B compounds based on Pt3X, Rh3X and Ir3X where data is presently lacking. Despite the efficiency of the model, it had limitations in predicting fault energies in non-binary compositions. To account for this, in the last section of this thesis, a novel quasi-chemical model incorporating the far-field composition effects, was developed. The model was validated for several pseudo-binary systems and it was found that be more accurate than the diffuse interface model. The two models were then extended to predict fault energies in binary L12-ordered A3B compounds at high temperatures, complex multicomponent L12-ordered A3B compounds, and binary D019-ordered A3B compounds.
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Книги з теми "Planar Fault Energies"

1

Kalender 2021: Faultier Energie Faul Müde Schlafen Süß Geschenk 120 Seiten, 6X9 , Jahres-, Monats-, Wochen- and Tages-Planer. Independently Published, 2020.

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2

Kalender 2021: Faultier Energie Faul Müde Schlafen Süß Geschenk 120 Seiten, 6X9 , Jahres-, Monats-, Wochen- and Tages-Planer. Independently Published, 2020.

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Частини книг з теми "Planar Fault Energies"

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Vamsi, K. V., and S. Karthikeyan. "Effect of Off-Stoichiometry and Ternary Additions on Planar Fault Energies in Ni3Al." In Superalloys 2012, 521–30. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118516430.ch57.

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2

Abu-Siada, Ahmed, Mohammad A. S. Masoum, Yasser Alharbi, Farhad Shahnia, and A. M. Shiddiq Yunus. "Superconducting Magnetic Energy Storage, a Promising FACTS Device for Wind Energy Conversion Systems." In Recent Advances in Renewable Energy, 49–86. UAE: Bentham Science Publishers Ltd., 2017. http://dx.doi.org/10.2174/9781681085425117020004.

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The applications of FACTS devices have become popular in the last few decades. There are many types of FACTS devices that are currently used in power systems to improve system stability, power quality and the overall reliability of the power systems. Since the involvement of renewable energies based power plants such as wind and PV, problems related to power system stability and quality has become even more complex, therefore the deployment of FACTS devices has become a challenging task. In this chapter, a Superconducting Magnetic Energy Storage (SMES) Unit is applied to improve the performance of Doubly Fed Induction Generator (DFIG) based wind turbine during various disturbances such as voltage sag, short circuit faults and load variation, including problems related to internal faults within the DFIG converters.
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Тези доповідей конференцій з теми "Planar Fault Energies"

1

Vamsi, K., and S. Karthikeyan. "Effect of Off-stoichiometry and Ternary Additions on Planar Fault Energies in Ni3Al." In Superalloys. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.7449/2012/superalloys_2012_521_530.

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