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Relevant bibliographies by topics / Zener pinning

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Academic literature on the topic 'Zener pinning'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Zener pinning"

1

Hazzledine, P. M., and R. D. J. Oldershaw. "Computer simulation of Zener pinning." Philosophical Magazine A 61, no. 4 (April 1990): 579–89. http://dx.doi.org/10.1080/01418619008231936.

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Liu, Yixiong, and B. R. Patterson. "Stereological analysis of Zener pinning." Acta Materialia 44, no. 11 (November 1996): 4327–35. http://dx.doi.org/10.1016/1359-6454(96)00107-3.

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Couturier, G., Claire Maurice, R. Fortunier, R. Doherty, and Julian H. Driver. "Finite Element Simulations of 3D Zener Pinning." Materials Science Forum 467-470 (October 2004): 1009–18. http://dx.doi.org/10.4028/www.scientific.net/msf.467-470.1009.

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An original model, based on a variational formulation for boundary motion by viscous drag, is developed to simulate single grain boundary motion and its interaction with particles. The equations are solved by a 3D finite element method to obtain the instantaneous velocity at each triangular element on the boundary surface, before, during and after contact with one or more particles. After validation by comparison with some simple, analytical and numerical cases, it is adapted to model curvature driven grain growth. For single phase material, the single grain boundary model closely matches the grain coarsening kinetics of a 3D multi boundary vertex model. In the presence of spherical incoherent particles the growth rate slows down to give a growth exponent of 2.5. When the boundary is anchored there is a significantly higher density, by a factor of 4, of particles on the boundary than the density predicted by the classic Zener analysis, and many particles exert less than this Zener drag force. As a result the Zener drag is increased by a factor of about 2.2. The limiting grain radius is compared with some experimental results.

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Kim, B. N., and T. Kishi. "Finite element simulation of Zener pinning behavior." Acta Materialia 47, no. 7 (May 1999): 2293–301. http://dx.doi.org/10.1016/s1359-6454(99)00069-5.

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Novikov, V. Yu. "On zener pinning in 3-D polycrystals." Scripta Materialia 42, no. 5 (February 2000): 439–43. http://dx.doi.org/10.1016/s1359-6462(99)00379-6.

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Zhou, Jian, Chao Li, Miao Guan, Fuzeng Ren, Xiaonan Wang, Shunhu Zhang, and Bingbing Zhao. "Zener pinning by coherent particles: pinning efficiency and particle reorientation mechanisms." Modelling and Simulation in Materials Science and Engineering 25, no. 6 (June 13, 2017): 065008. http://dx.doi.org/10.1088/1361-651x/aa6cfb.

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Grasserbauer, Jakob, Irmgard Weißensteiner, Georg Falkinger, Peter J. Uggowitzer, and Stefan Pogatscher. "Influence of Fe and Mn on the Microstructure Formation in 5xxx Alloys—Part II: Evolution of Grain Size and Texture." Materials 14, no. 12 (June 15, 2021): 3312. http://dx.doi.org/10.3390/ma14123312.

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In recent decades, microstructure and texture engineering has become an indispensable factor in meeting the rising demands in mechanical properties and forming behavior of aluminum alloys. Alloying elements, such as Fe and Mn in AlMg(Mn) alloys, affect the number density, size and morphology of both the primary and secondary phases, thus altering the grain size and orientation of the final annealed sheet by Zener pinning and particle stimulated nucleation (PSN). The present study investigates the grain size and texture of four laboratory processed AlMg(Mn) alloys with various Fe and Mn levels (see Part I). Common models for deriving the Zener-limit grain size are discussed in the light of the experimental data. The results underline the significant grain refinement by dispersoids in high Mn alloys and show a good correlation with the Smith–Zener equation, when weighting the volume fraction of the dispersoids with an exponent of 0.33. Moreover, for high Fe alloys a certain reduction in the average grain size is obtained due to pinning effects and PSN of coarse primary phases. The texture analysis focuses on characteristic texture transformations occurring with pinning effects and PSN. However, the discussion of the texture and typical PSN components is only possible in terms of trends, as all alloys exhibit an almost random distribution of orientations.

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Kolesnikov, Dmitro, Andrey Belyakov, Alla Kipelova, Valeriy Dudko, Rustam Kaibyshev, and Dmitri A. Molodov. "Zener Pinning Pressure in Tempered Martensite Lath Structure." Materials Science Forum 715-716 (April 2012): 745–50. http://dx.doi.org/10.4028/www.scientific.net/msf.715-716.745.

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The Zener drag force exerted by M23C6carbides, Fe2(W,Mo) Laves phase and M(C,N) particles for migration of different grain boundaries in P92-type and P911+3%Co heat-resistant steels was calculated. In particular, the prior austenite grain boundaries (PAGB), boundaries of packets and blocks, which are mainly high-angle boundaries (HAGB), were addressed. Zener pinning pressures were determined for each type of dispersoids separately taking into account that the M23C6carbides, Fe2(W,Mo) Laves phase are inhomogeneously distributed such that they are mainly located at the boundaries, and the M(C,N) dispersoids are uniformly distributed throughout the metallic matrix. In the both steels, the pinning pressure from the second phase particles located at grain boundaries is about an order of magnitude higher than that caused by homogeneously distributed MX precipitates. In spite of numerous second phase particles precipitated during tempering, grain growth (although rather moderate) occurred during the creep tests of the studied materials. The driving pressure for grain boundary motion might be mostly associated with high dislocation density retained in the tempered martensite structure. The resulting pressure for grain growth in the P92-type steel under creep conditions at 600 and 650°C is somewhat higher than that for the P911 steel.

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HARUN, A., E. HOLM, M. CLODE, and M. MIODOWNIK. "On computer simulation methods to model Zener pinning." Acta Materialia 54, no. 12 (July 2006): 3261–73. http://dx.doi.org/10.1016/j.actamat.2006.03.012.

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Wörner, C. H., and A. Olguín. "Potential well and thermal detachment in Zener pinning." Scripta Metallurgica et Materialia 28, no. 1 (January 1993): 1–5. http://dx.doi.org/10.1016/0956-716x(93)90527-y.

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Dissertations / Theses on the topic "Zener pinning"

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Harun, Azmir. "Computer simulations of Zener pinning." Thesis, King's College London (University of London), 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421469.

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Miodownik, Mark A. "Fundamentals of grain growth phenomena in ODS alloys." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318817.

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Couturier, Gaël. "Contribution à l'étude de la dynamique du Zener Pinning : simulations numériques par éléments finis." Saint-Etienne, EMSE, 2003. http://www.theses.fr/2003EMSE0008.

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La méthode des éléments finis est employée pour simuler la dynamique du Zener pinning à l'échelle d'un seul joint de grains en mouvement, interagissant avec une ou plusieurs particules. Des résultats de simulations dans une configuration axisymétrique mettent en évidence l'influence des paramètres caractéristiques du joint et de la particule sur l'efficacité de l'épinglage de Zener. Un modèle 3D est ensuite développé pour traiter des configurations d'interaction non axisymétriques. Ce modèle montre que le positionnement des particules à la surface du joint ainsi que le nombre de particules en contact agissent sur la durée d'interaction. Puis le modèle 3D est exploité pour simuler la croissance normale et l'équilibre d'un agrégat en présence de particules. Les simulations réalisées mettent en évidence l'influence sur la cinétique de croissance, et sur la taille de grains à l'équilibre, de la taille des particules, de leur fraction volumique et de la taille initiale des grains
The finite element method is employed to study Zener pinning dynamic effects of a moving grain boundary interacting with one or several particles. An axi-symmetric configuration is used to evaluate the influence of grain boundary and particle parameters on the pinning efficiency. A 3D model is then developed to study more general interaction configurations. The relative position of the particles on the grain boundary and the number of particles in contact have an influence on the interaction duration. Finally, the 3D model is used to simulate the normal grain growth and stagnation of a polycrystalline aggregate in presence of particles. Growth is schematised by the migration of an average grain boundary in a homogeneous dispersion of particles. The influence of particle size, particle volume fraction and initial grain size on growth kinetics and equilibrium grain size is studied

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Cherukuri, Balakrishna. "Microstructural Stability and Thermomechanical Processing of Boron Modified Beta Titanium Alloys." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1229656783.

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Agnoli, Andrea. "Origine de l’éclatement de grain sur des pièces forgées en Inconel 718." Thesis, Paris, ENMP, 2013. http://www.theses.fr/2013ENMP0098/document.

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L'Inconel 718 est un superalliage base nickel très utilisé pour produire les disques de turboréacteurs. Typiquement, une gamme de forgeage à chaud se compose de plusieurs étapes de déformation et de recuit. La présence des particules de seconde phase (particules de phase delta dans l'Inconel 718) permet en principe de limiter la croissance de grains pendant les étapes de recuit grâce au phénomène d'ancrage de Zener. Néanmoins, l'hétérogénéité microstructurale (distribution des particules, écrouissage, composition chimique) peut favoriser une croissance anormale des grains pendant le recuit. Ce phénomène est connu industriellement sous la terminologie d'"éclatement de grains". Les objectifs de la thèse étaient d'identifier les mécanismes responsables de l'éclatement des grains qui peut survenir durant les étapes de recuit sur les pièces forgées en Inconel 718, de les modéliser, et de simuler numériquement le phénomène. Les mécanismes physiques à l'origine du phénomène sont d'abord étudiés expérimentalement grâce à la caractérisation (par MEB et EBSD) des pièces forgées. L'influence des particules de seconde phase et de l'énergie stockée (estimée par des mesures de désorientations intragranulaires) est notamment étudiée. A partir des observations réalisées, une explication est proposée : le phénomène apparaît lorsque les forces motrices pour la migration des joints de grains dépassent la force de freinage de Zener ; ceci peut se produire lorsque la microstructure contient de l'énergie stockée, distribuée de manière hétérogène. Des essais de torsion à chaud sont mis en place pour reproduire, en laboratoire, le même phénomène, étudier la sensibilité aux paramètres thermomécaniques, et tester les hypothèses émises concernant les mécanismes. Les mécanismes ainsi identifiés comme responsables de l'éclatement de grains sont enfin simulés au moyen d'un modèle numérique en 2D. Le modèle numérique en champ complet est basé sur la méthode des éléments finis, et utilise le formalisme level-set pour décrire les joints de grains. La simulation de l'évolution microstructurale prend en compte à la fois les forces motrices des joints de grains liées à la capillarité et à l'énergie stockée, et l'interaction des joints de grains avec les particules de seconde phase. Ainsi, l'effet de la distribution de l'énergie stockée (estimée à partir de données expérimentales) a pu être étudié numériquement dans des microstructures avec particules
Inconel 718 is a nickel base superalloy commonly used to manufacture the rotating disks of turbojet engines. Such disks are generally produced by hot forging, which involves a sequence of different deformation and annealing steps. The presence of second phase particles (delta phase in Inconel 718) is commonly exploited to limit grain growth during annealing via the Zener pinning phenomenon. Nonetheless, microstructure heterogeneity (with regards to second phase particles, hardening, texture and chemical composition) can lead to inhomogeneous grain growth during annealing. The objectives of this PhD work were to understand, model and simulate numerically the phenomenon of inhomogeneous grain growth that can occur in Inconel 718 turbine disks during the annealing steps of hot forging sequences. The physical mechanisms which may explain the occurrence of the phenomenon are investigated experimentally by performing SEM and EBSD analyses of Inconel 718 industrial pieces. The focus is placed on the influence of second phase particles and strain energy (estimated from intragranular misorientations) on the occurrence of the phenomenon. From those observations, it is inferred that the phenomenon occurs when the grain boundary driving forces overcome the Zener pinning forces; this is achieved when stored energy is present and heterogeneously distributed. Moreover, hot torsion tests are carried out to reproduce the phenomenon in laboratory, to evaluate its sensibility to thermomechanical parameters and to test the previously postulated mechanism. The validity of this mechanism is finally demonstrated by modelling numerically the phenomenon in 2D. The full field numerical model is based on a level set description of the grain boundaries in a finite element context. Microstructure evolution is simulated explicitly taking into account Zener pinning, capillarity and stored energy driven grain growth in a single framework. The effect of strain stored energy distributions (estimated from experimental data) in pinned microstructures is investigated focusing on the conditions leading to inhomogeneous grain growth

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Tsivoulas, Dimitrios. "Effects of combined Zr and Mn additions on the microstructure and properties of AA2198 sheet." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/effects-of-combined-zr-and-mn-additions-on-the-microstructure-and-properties-of-aa2198-sheet(6bb2c9db-7584-464b-8064-bab0cc2d397c).html.

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The effect of individual and combined zirconium and manganese additions have been compared for an AA2198 6 mm thick sheet in T351 temper regarding their influence primarily on recrystallisation resistance and secondly on fracture toughness and overageing resistance. A complete characterisation of the dispersoid distributions was carried out for a deeper understanding of the effects of the Al3Zr and Al20Cu2Mn3 particles, involving studying their formation from the as-cast and homogenised stage.The most important finding in this work was the lower recrystallisation resistance in the alloy containing 0.1 wt%Zr + 0.3 wt%Mn compared to that containing only 0.1 wt%Zr. This result was rather unexpected, if one considers the opposite microsegregation patterns of Zr and Mn during casting, which leads to dispersoids occupying the majority of the grains’ volume and minimising dispersoid-free zones that could be potential sites for nucleation of recrystallisation. The other two alloys with dispersoid additions 0.05 wt%Zr + 0.3 wt%Mn and 0.4 wt%Mn, were partially and fully recrystallised respectively in the rolled T351 condition.Equally important in this work, was the observation that the opposite microsegregation trend of Zr and Mn sufficed to restrict grain growth in unrecrystallised areas. The 0.1Zr-0.3Mn alloy exhibited the lowest grain size of all alloys, both in the T351 temper and after annealing at 535oC for up to 144 hours. The reason for this was the combined action of Al20Cu2Mn3 dispersoids and Mn solute in the regions where the Zr concentration was low (i.e. near the grain boundaries), which offered additional pinning pressure to those areas compared to the 0.1Zr alloy.The lower recrystallisation resistance of the 0.1Zr-0.3Mn alloy was explained on the grounds of two main factors. The first was the lower subgrain size and hence stored energy within bands of Al20Cu2Mn3 dispersoids, which increased the driving force for recrystallisation in these regions. The second was the interaction between Zr and Mn that led to a decrease in the Al3Zr number density and pinning pressure. Since Zr was the dominant dispersoid family in terms of inhibiting recrystallisation, inevitably this alloy became more prone to recrystallisation. The Al3Zr pinning pressure was found to be much lower especially within bands of Al20Cu2Mn3 dispersoids. The detrimental effect of the Mn addition on the Al3Zr distribution was proven not to result from the dissolution of Zr within Mn-containing phases, and several other phases, at the grain interior and also in grain boundaries. The observed effect could not be precisely explained at this stage.Concerning mechanical properties, the 0.1Zr alloy exhibited the best combination of properties in the Kahn tear tests for fracture toughness. Further, it had a higher overageing resistance compared to the 0.1Zr-0.3Mn alloy.As an overall conclusion from this work, considering all the studied properties here that are essential for damage tolerant applications, the addition of 0.1 wt%Zr to the AA2198 6 mm thick sheet was found to be superior to that of the combined addition of 0.1 wt%Zr + 0.3 wt%Mn.

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Siyasiya, Charles Witness. "Effect of sulphur content on the recrystallisation behaviour of cold worked low carbon aluminium-killed strip steels." Thesis, 2007. http://hdl.handle.net/2263/24240.

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Book chapters on the topic "Zener pinning"

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Scholtes, B., B. Scholtes, D. Ilin, A. Settefrati, N. Bozzolo, A. Agnoli, and M. Bernacki. "Full Field Modeling of the Zener Pinning Phenomenon in a Level Set Framework - Discussion of Classical Limiting Mean Grain Size Equation." In Superalloys 2016, 497–503. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119075646.ch53.

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Huang, K., and R. E. Logé. "Zener Pinning." In Reference Module in Materials Science and Materials Engineering. Elsevier, 2016. http://dx.doi.org/10.1016/b978-0-12-803581-8.03211-2.

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Miodownik, M. A. "Zener Pinning." In Encyclopedia of Materials: Science and Technology, 9855–59. Elsevier, 2001. http://dx.doi.org/10.1016/b0-08-043152-6/01783-6.

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Conference papers on the topic "Zener pinning"

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Agnoli, A., M. Bernacki, N. Bozzolo, D. Ilin, B. Scholtes, and A. Settefrati. "Full Field Modeling of the Zener Pinning Phenomenon in a Level Set Framework – Discussion of Classical Limiting Mean Grain Size Equation." In Superalloys 2016. The Minerals, Metals & Materials Society, 2016. http://dx.doi.org/10.7449/superalloys/2016/superalloys_2016_497_503.

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