Thematische Bibliographien / Nanoprecipitace

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Auswahl der wissenschaftlichen Literatur zum Thema „Nanoprecipitace“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 12. Februar 2022

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Zeitschriftenartikel zum Thema "Nanoprecipitace"

Peng, Shenyou, Yujie Wei und Huajian Gao. „Nanoscale precipitates as sustainable dislocation sources for enhanced ductility and high strength“. Proceedings of the National Academy of Sciences 117, Nr. 10 (24.02.2020): 5204–9. http://dx.doi.org/10.1073/pnas.1914615117.

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Traditionally, precipitates in a material are thought to serve as obstacles to dislocation glide and cause hardening of the material. This conventional wisdom, however, fails to explain recent discoveries of ultrahigh-strength and large-ductility materials with a high density of nanoscale precipitates, as obstacles to dislocation glide often lead to high stress concentration and even microcracks, a cause of progressive strain localization and the origin of the strength–ductility conflict. Here we reveal that nanoprecipitates provide a unique type of sustainable dislocation sources at sufficiently high stress, and that a dense dispersion of nanoprecipitates simultaneously serve as dislocation sources and obstacles, leading to a sustainable and self-hardening deformation mechanism for enhanced ductility and high strength. The condition to achieve sustainable dislocation nucleation from a nanoprecipitate is governed by the lattice mismatch between the precipitate and matrix, with stress comparable to the recently reported high strength in metals with large amount of nanoscale precipitates. It is also shown that the combination of Orowan’s precipitate hardening model and our critical condition for dislocation nucleation at a nanoprecipitate immediately provides a criterion to select precipitate size and spacing in material design. The findings reported here thus may help establish a foundation for strength–ductility optimization through densely dispersed nanoprecipitates in multiple-element alloy systems.

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Ruault, M.-O., F. Fortuna, H. Bernas, J. Chaumont, O. Kaïtasov und V. A. Borodin. „In situ Transmission Electron Microscopy Ion Irradiation Studies at Orsay“. Journal of Materials Research 20, Nr. 7 (01.07.2005): 1758–68. http://dx.doi.org/10.1557/jmr.2005.0219.

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Crucial features of materials evolution due to ion beam irradiation are often revealed only through studies of process dynamics. We review some significant examples of such experiments performed over the last 25 years with the Orsay in situ facility: a transmission electron microscope setup (with temperature stages operating between 4 and 1000 K) on a medium energy (3–570 keV) ion beam line. New results on nanocavity evolution and metal silicide nanoprecipitates in Si are presented briefly.We show that CoSi2 nanoprecipitate growth is mainly due to the constant Co atom contribution from the ion beam, and CoSi2 platelet growth is the result of a three-dimensional to two-dimensional growth mode transition.

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Li, Guoqiang, Shao-Ju Shih, Shichun Mu, Yadong Xu und Wanqi Jie. „Study of Te nanoprecipitates in CdZnTe crystals“. Journal of Materials Research 25, Nr. 7 (Juli 2010): 1298–303. http://dx.doi.org/10.1557/jmr.2010.0171.

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In-depth studies of the two types of Te nanoprecipitates, linear and elliptic, in Cd1–xZnxTe (CZT) crystals grown by a modified vertical Bridgman method have been carried out. Electron diffraction suggests that linear Te nanoprecipitates align their Te atoms in a similar way to CZT structure, while elliptic Te nanoprecipitates cluster Te atoms following the pure trigonal Te structure. The three-dimensional morphology for both linear and elliptic Te nanoprecipitates has been revealed by delicate energy-dispersive x-ray analysis under electron microscopy. The density of elliptic Te nanoprecipitates ranges from 1015 to 1017 cm−3, while linear ones usually several times lower for a certain CZT wafer. The origin of both types of Te nanoprecipitates has been discussed in terms of the local density of intrinsic point defects in CZT. CZT properties are influenced more negatively by elliptic Te nanoprecipitates, which shed light on the methodology for crystal growth: preventing the clustering of intrinsic point defects during the crystal growth will be essential to obtain high quality CZT crystal.

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Courtney-Davies, Ciobanu, Verdugo-Ihl, Slattery, Cook, Dmitrijeva, Keyser et al. „Zircon at the Nanoscale Records Metasomatic Processes Leading to Large Magmatic–Hydrothermal Ore Systems“. Minerals 9, Nr. 6 (16.06.2019): 364. http://dx.doi.org/10.3390/min9060364.

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The petrography and geochemistry of zircon offers an exciting opportunity to better understand the genesis of, as well as identify pathfinders for, large magmatic–hydrothermal ore systems. Electron probe microanalysis, laser ablation inductively coupled plasma mass spectrometry, high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) imaging, and energy-dispersive X-ray spectrometry STEM mapping/spot analysis were combined to characterize Proterozoic granitic zircon in the eastern Gawler Craton, South Australia. Granites from the ~1.85 Ga Donington Suite and ~1.6 Ga Hiltaba Suite were selected from locations that are either mineralized or not, with the same style of iron-oxide copper gold (IOCG) mineralization. Although Donington Suite granites are host to mineralization in several prospects, only Hiltaba Suite granites are considered “fertile” in that their emplacement at ~1.6 Ga is associated with generation of one of the best metal-endowed IOCG provinces on Earth. Crystal oscillatory zoning with respect to non-formula elements, notably Fe and Cl, are textural and chemical features preserved in zircon, with no evidence for U or Pb accumulation relating to amorphization effects. Bands with Fe and Ca show mottling with respect to chloro–hydroxy–zircon nanoprecipitates. Lattice defects occur along fractures crosscutting such nanoprecipitates indicating fluid infiltration post-mottling. Lattice stretching and screw dislocations leading to expansion of the zircon structure are the only nanoscale structures attributable to self-induced irradiation damage. These features increase in abundance in zircons from granites hosting IOCG mineralization, including from the world-class Olympic Dam Cu–U–Au–Ag deposit. The nano- to micron-scale features documented reflect interaction between magmatic zircon and corrosive Fe–Cl-bearing fluids in an initial metasomatic event that follows magmatic crystallization and immediately precedes deposition of IOCG mineralization. Quantification of α-decay damage that could relate zircon alteration to the first percolation point in zircon gives ~100 Ma, a time interval that cannot be reconciled with the 2–4 Ma period between magmatic crystallization and onset of hydrothermal fluid flow. Crystal oscillatory zoning and nanoprecipitate mottling in zircon intensify with proximity to mineralization and represent a potential pathfinder to locate fertile granites associated with Cu–Au mineralization.

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Park, Ji-Hoon, Kee-Ahn Lee, Sung-Jae Won, Yong-Bum Kwon und Kyou-Hyun Kim. „Influence of Sc Microalloying on the Microstructure of Al5083 Alloy and Its Strengthening Effect“. Metals 11, Nr. 7 (14.07.2021): 1120. http://dx.doi.org/10.3390/met11071120.

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In this study, we investigate the influence of Sc microalloying on the microstructure of the Al5083 alloy. Trace amounts of Sc addition drastically improve the mechanical properties of the Al5083 alloy from 216 MPa to 233 MPa. Macroscopically, the addition of Sc significantly reduces the grain size of Al by approximately 50%. Additionally, a microstructural investigation reveals that the Sc microalloying element induces fine Al3Sc nanoprecipitates in the Al matrix. The formation of Al3Sc nanoprecipitates results in a pinning effect on the dislocations, leading to accumulated dislocations. Compared to a Sc-free Al5083 alloy specimen, the number density of dislocations in the Sc-added Al5083 alloy significantly increases after hot rolling, enhancing the tensile properties. We reveal that the improved mechanical properties of Al5083 with Sc microalloying originate from the grain refinement and the formation of fine Al3Sc nanoprecipitates.

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Wood, Jonathan. „Nanoprecipitate structure in Al alloys revealed“. Materials Today 9, Nr. 6 (Juni 2006): 9. http://dx.doi.org/10.1016/s1369-7021(06)71527-9.

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Hern, F. Y., A. Hill, A. Owen und S. P. Rannard. „Co-initiated hyperbranched-polydendron building blocks for the direct nanoprecipitation of dendron-directed patchy particles with heterogeneous surface functionality“. Polymer Chemistry 9, Nr. 14 (2018): 1767–71. http://dx.doi.org/10.1039/c8py00291f.

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A synthetic strategy branched polymer building blocks that allow the rapid construction of patchy nanoparticles is presented. Hyperbranched polydendrons with mixtures of PEG and thiol-functional dendrons nanoprecipitate to form isolated zones that are imaged with gold nanoparticles.

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Broad, Alexander, Ian J. Ford, Dorothy M. Duffy und Robert Darkins. „Magnesium-rich nanoprecipitates in calcite: atomistic mechanisms responsible for toughening in Ophiocoma wendtii“. Physical Chemistry Chemical Physics 22, Nr. 18 (2020): 10056–62. http://dx.doi.org/10.1039/d0cp00887g.

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Dorignac, D., S. Schamm, C. Grigis, J. Sévely, J. Santiso und A. Figueras. „Y2O3 nanoprecipitate/YBaCuO matrix interfaces: HREM study“. Physica C: Superconductivity 235-240 (Dezember 1994): 617–18. http://dx.doi.org/10.1016/0921-4534(94)91532-6.

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Tang, Guodong, Qiang Wen, Teng Yang, Yang Cao, Wei Wei, Zhihe Wang, Zhidong Zhang und Yusheng Li. „Rock-salt-type nanoprecipitates lead to high thermoelectric performance in undoped polycrystalline SnSe“. RSC Advances 7, Nr. 14 (2017): 8258–63. http://dx.doi.org/10.1039/c7ra00140a.

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Dissertationen zum Thema "Nanoprecipitace"

Xie, Ling. „Electron tomography analysis of 3D order and interfacial structure in nano-precipitates“. Doctoral thesis, Uppsala universitet, Tillämpad materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-284102.

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Structural characterization is essential to understand the formation mechanisms of the nanostructures in thin absorber layers in third generation solar cells and amyloid protein aggregates. Since to the dimension of the precipitated structures is in nanometer scale, electron tomography technique in transmission electron microscopy (TEM) has been applied as a major tool to analyze the 3D order and distribution of precipitates using the electron tomography technique. Silicon rich silicon carbide (SRSC) films were deposited by plasma enhanced chemical vapor deposition (PECVD) technique and annealed in the nitrogen atmosphere for 1 hour at 1100 °C. The spectrum-imaging (SI) technique in Energy filtered TEM (EFTEM) imaging mode was used to develop electron tomography. From the reconstructed sub-volumes, the complex, three dimensional interfacial nanostructure between the precipitated NPs and their parental matrix was observed and explained in terms of thermodynamic concepts. Additionally, the feasibility of raw data 4D electron tomography has been demonstrated using the EFTEM SI dataset. The aggregation process of the human islet amyloid polypeptide (hIAPP) has a great impact on human health. In this thesis, a model system has been taken to study the ultrastructure of the hIAPP aggregates that are present in the fat body tissue surrounding the brain of Drosophila melanogaster. Electron tomography technique on TEM revealed clear crystalline structures in 3D. For the first time, the presence of a 5-fold twinned structure in biology was discovered. An intriguing finding is the filament like interconnection of hIAPP protein granules observed predominantly along the nearest neighbor directions. This suggests the existence of the directional binding forces between two nearest protein granules in addition to dipole-dipole interactions.

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Pereira, André Anderson Costa. „Desenvolvimento de sistema de atomização de solução polimérica em meio circulante para obtenção de partículas nano“. PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA QUÍMICA, 2018. https://repositorio.ufrn.br/jspui/handle/123456789/25447.

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Partículas poliméricas formadas em escala nanométrica são de fundamental interesse atualmente, principalmente quando utilizadas como sistemas carreadores na liberação controlada de fármacos, cosméticos e nutracêuticos, bem como no recobrimento de matérias com propriedades magnéticas. O presente estudo tem como objetivo desenvolver um sistema para produção de partículas de poli (metacrilato de metila) (PMMA) e policaprolactona (PCL) a partir da atomização de solução polimérica em meio antisolvente. Neste sistema, soluções poliméricas em diferentes solventes são preparadas e atomizadas na forma de um spray. As gotículas geradas com a atomização entram em contato com um líquido antisolvente que provoca a precipitação e formação das partículas poliméricas. Neste trabalho, experimentos usando o sistema proposto foram realizados em diferentes condições operacionais e as partículas obtidas foram analisadas por espalhamento dinâmico de luz (Dynamic Light Scattering - DLS), microscopia eletrônica de transmissão (MET) e microscopia eletrônica de varredura (MEV). Os resultados demonstraram que é possível obter partículas com características de nanoesferas/nanocápsulas e nanofibras com distribuição de tamanho na faixa de 50 a 5000 nm. Também foi possível observar que as variáveis do processo como a natureza do polímero, o tipo de solvente (acetona, acetato de etila, álcool etílico, álcool isopropílico e álcool propílico), a pressão da atomização (0,25 – 3 bar) e a temperatura do líquido antisolvente (10 – 40°C) afetam diretamente a morfologia e a distribuição de tamanho de partícula (DTP). Além disso, foi avaliado o potencial de encapsulamento do sistema proposto. Óleo de algodão e aluminato de ferro (espinélio inverso) foram utilizados como material a ser encapsulado. As partículas produzidas nesta avaliação foram analisadas por DLS, MET, microscopia eletrônica de varredura com emissão de campo (MEV-FEG), espectroscopia de infravermelho com transformada de fourier (Fourier Transform Infrared Spectroscopy - FTIR) e difração de raios X (DRX) para a verificação do encapsulamento. De acordo com estes resultados, constatou-se a formação de partículas carreadoras, com características de nanocápsulas e nanoesferas. Ou seja, o material encapsulado pode ser encontrado dentro da partícula polimérica ou aderido a superfície da mesma, respectivamente.
Polymeric particles formed on a nanometric scale are of fundamental interest today, especially when used as carrier systems in the controlled release of drugs, cosmetics and nutraceuticals, as well as in the coating of materials with magnetic properties. The present study aims to develop a system for the production of poly (methyl methacrylate) (PMMA) and polycaprolactone (PCL) particles from the atomization of polymer solution in antisolvent medium. In this system, polymer solutions in different solvents are prepared and atomized in the form of a spray. The droplets generated with the atomization come into contact with an antisolvent liquid which causes the precipitation and formation of the polymer particles. In this work, experiments using the proposed system were performed under different operating conditions and the particles obtained were analyzed by Dynamic Light Scattering (DLS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results demonstrated that it is possible to obtain particles with characteristics of nanospheres / nanocapsules and nanofibers with size distribution in the range of 50 to 5000 nm. It was also possible to observe that the process variables such as the nature of the polymer, type of solvent (acetone, ethyl acetate, ethyl alcohol, isopropyl alcohol and propyl alcohol), atomization pressure (0.25-3 bar) and antisolvent medium temperature (10-40°C) directly affect the morphology and particle size distribution (DTP). In addition, the potential of encapsulation of the proposed system was evaluated. Cotton oil and iron aluminate (inverse spinel) were used as the material to be encapsulated. The particles produced in this evaluation were analyzed by DLS, MET, field emission scanning electron microscopy (MEV-FEG), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD) for the encapsulation check. According to these results, it was verified the formation of carrier particles, with characteristics of nanocapsules and nanospheres. That is, the encapsulated material can be found within the polymer particle or adhered to the surface thereof, respectively.

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Širajová, Daniela. „Příprava polymerních fluorescenčních nanočástic“. Master's thesis, 2021. http://www.nusl.cz/ntk/nusl-445759.

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Charles University in Prague, Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical Technology Consultant: PharmDr. Ondřej Holas, PhD. Student: Daniela Širajová Title of thesis: Preparation of polymeric fluorescent nanoparticles Nanoparticles based on biodegradable polyesters are a widely used platform for targeted drug delivery and subsequent controlled release. The aim of this diploma thesis was to prepare and optimize the preparation of polymeric nanoparticles with a fluorescent dye as a model substance. The nanoprecipitation method was used to prepare the nanoparticles. Nanoparticles prepared from two types of PLGA polymers (COOH terminated and ester terminated) were evaluated and compared. The surfactant and stabilizer were used in various concentration ratios to optimize the preparation. The surfactant was sodium cholate at concentrations of 0.1%, 0.5%, 1%, 2% and 5%. The nanoparticles were stabilized with Pluronic F-127 poloxamer at concentrations of 0.1%, 0.5% and 1%. Nanoparticles were compared in terms of encapsulation efficiency, particle size and zeta potential. In a dissolution experiment, the amount of fluorescein released was evaluated and compared as a function of time (48 hours) with acid-terminated PLGA and sodium cholate at concentrations of 0.1% and 2%....

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Kostíková, Katarína. „Studium vlivu povrchově aktivních látek na parametry polymerních nanočástic“. Master's thesis, 2021. http://www.nusl.cz/ntk/nusl-446625.

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Charles University in Prague, Faculty of Pharmacy in Hradec Králové Department of Pharmaceutical Technology Consultant: PharmDr. Ondřej Holas, PhD. Student: Katarína Kostíková Title of thesis: Study of the surfactants effect on polymer nanoparticle parameters The main aim of this Diploma thesis was to examine whether the use of various stabilizers has any effect on the resultant size of prepared nanoparticles and to find out which type of stabilizer is the most appropriate in terms of preparation of the nanoparticles of the necessary size, adequate polydispersity and steadiness. The preparation of nanoparticles was based on the use of sodium cholate as a surfactant and polymer PLGA (poly (lactid-co-glycolic acid)) consisting of monomers of lactic and glycolic acids. Nanoparticles were prepared by means of nanoprecipitation method. Sodium cholate solution has always been prepared in water in different concentration: 0.005%, 0.01%, 0.02%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 1%, 2%, and 5%. The following have been used as stabilizers: poloxamer 407, polyvinyl alcohol, cetrimonium-bromide (CTAB), and polysorbate 20, all of them in concentration of 0.1% and sorbitan-monostearate in concentration of 0.01%. Measurement of the size of created nanoparticles was performed using the device Zetasizer at the...

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Yang, Kuo-Cheng, und 楊國政. „Defect clusters, nanoprecipitates and Brownian motion of particles in Mg-doped Co1-xO, Ti-doped Co1-xO, Ti-doped MgO and Zr-doped TiO2“. Thesis, 2005. http://ndltd.ncl.edu.tw/handle/07470823059668375969.

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博士
國立中山大學
材料科學研究所
93
In part I, MgO and Co1-xO powders in 9:1 and 1:9 molar ratio (denoted as M9C1 and M1C9 respectively) were sintered and homogenized at 1600oC followed by annealing at 850 and 800oC, respectively to form defect clusters and precipitates. Analytical electron microscopic (AEM) observations indicated the protoxide remained as rock salt structure with complicated planar diffraction contrast for M9C1 sample, however with spinel paracrystal precipitated from the M1C9 sample due to the assembly of charge- and volume-compensating defects of the 4:1 type, i.e. four octahedral vacant sites surrounding one Co3+-filled tetrahedral interstitial site. The spacing of such defect clusters is 4.5 times the lattice spacing of the average spinel structure of Mg-doped Co3-dO4, indicating a higher defect cluster concentration than undoped Co3-dO4. The {111} faulting of Mg-doped Co3-dO4/Co1-xO in the annealed M1C9 sample implies the possible presence of zinc blend-type defect clusters with cation vacancies assembled along oxygen close packed (111) plane. In part II, the Mg2TiO4/MgO composites prepared by reactive sintering MgO and TiO2 powders (9:1 molar ratio) at 1600oC and then air-cooled or further aged at 900oC were studied by X-ray diffraction and (AEM) in order to characterize the microstructures and formation mechanism of nanosized Mg2TiO4 spinel precipitated from Ti-doped MgO. Expulsion of Ti4+ during cooling caused the formation of (001)-specific G.P. zone under the influence of thermal/sintering stress and then the spinel precipitates, which were about 30 nm in size and nearly spherical with {111} and {100} facets to minimize coherency strain energy and surface energy. Secondary nano-size spinel was precipitated and became site saturated during aging at 900oC, leaving a precipitate free zone at the grain boundaries of Ti-doped MgO. The intergranular spinel became progressively Ti-richer upon aging 900oC and showed <110>-specific diffuse scatter intensity likely due to short range ordering and/or onset decomposition. In part III, the Co1-xO/Co2TiO4 composite prepared by reactive sintering CoO and TiO2 powders (9:1 molar ratio) at 1450oC and then air-cooled were studied by X-ray diffraction and AEM in order to characterize the microstructures and formation mechanism of nanosized Co2TiO4 spinel precipitated from Ti-doped Co1-xO. Slight expulsion of Ti4+ during cooling caused the precipitation of nanosize Co2TiO4 spinel. Bulk site saturation also caused impingement of the Co2TiO4 precipitates upon growth. The Co3-dO4 spinel, as an oxidatin product of Co1-xO, was found to form at free surface and the Co1-xO/Co2TiO4 interface. The Co2TiO4 spinel particles formed by reactive sintering rather than precipitation were able to detach from the Co1-xO grain boundaries to reach parallel epitaxial orientation with respect to the host Co1-xO grains via Brownian-type rotation of the embedded particles. In part IV, AEM was used to study the defect microstructures of Zr-dissolved TiO2 prepared via reactive sintering the ZrO2 and TiO2 powders (8:92 in molar ratio, designated as Z8T92) at 1600oC for 24 h and then aged at 900oC for 2-200 h in air. The Zr-dissolved TiO2 with rutile structure showed dislocation arrays, defect clusters, G.P. zone, superlattice, nanometer-size domains incommensurate and commensurate superstructure, may be the precursor of ZrTi2O6 precipitates at 900oC. The rutile showed diffuse diffractions along [001] direction as a result of Zr4+ substitution for Ti4+ with volume compensating defect clusters. Incommensurate and commensurate structures, as indicated by diffraction splitting and extra diffraction along <100> and <010> directions may be attributed to the ordering and clustering process of Zr and Ti atoms in these directions. Part V, deals with the reactive sintering of ZrO2 and TiO2 powders (1:4 molar ratio) at 1400 to 1600oC in air to form orthorhombic ZrTiO4 (a-PbO2-type structure, denoted as a) and to study its epitaxial reorientation in the matrix of tetragonal TiO2 (rutile) grains with Zr4+ (15 mol %) dissolution. The epitaxial relationship of intragranular ZrTiO4 and Zr-dissolved rutile (denoted as r) was determined by electron diffraction as [010]a//[011]r; (001)a // (011)r (i.e. [100]a // [100]r; (001)a // (011)r). The reorientation of the intragranular particles in the composites can be reasonably explained by rotation of the nonepitaxial particles above a critical temperature (T/Tm > 0.8) and below a critical particle size for anchorage release at interface with respect to the host grain. Reactive sintering facilitated the reoreientation process for the particles about to detach from the grain boundaries. The Brownian rotation of the confined ZrTiO4 particles in rutile grains was activated by a beneficial lower interfacial energy for the epitaxial relationship, typically forming lath-like ZrTiO4 with (101)a/(211)r habit plane having fair match of oxygen atoms at the interface. Further aging at 900oC for 50 h in air caused modulated and periodic antiphase domains in ZrTiO4 matrix, as likely precursor of equilibrium ZrTi2O6.

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Buchteile zum Thema "Nanoprecipitace"

Rivera-Diaz-del-Castillo, Pedro E. J., Maarten de Jong und Marcel H. F. Sluiter. „Thermomechanical Processing Design of Nanoprecipitate Strengthened Alloys Employing Genetic Algorithms“. In Supplemental Proceedings, 477–84. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062142.ch58.

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De Luca, Anthony, David C. Dunand und David N. Seidman. „Scandium-Enriched Nanoprecipitates in Aluminum Providing Enhanced Coarsening and Creep Resistance“. In The Minerals, Metals & Materials Series, 1589–94. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72284-9_207.

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Zhao, Y., Y. Cui, H. Guo, S. S. Xu, X. H. Wei und Z. W. Zhang. „Effects of Aging Treatment on the Microstructure and Mechanical Properties of a Nanoprecipitates-Strengthened Ferritic Steel“. In The Minerals, Metals & Materials Series, 27–37. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72131-6_3.

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Majumdar, Shrabani, Kumar Sadanand Arya, Ashok Kumar und P. V. Dilip. „Comparison of LCF Performance of a Ferritic Steel Strengthened with Nanoprecipitates with that of a Conventional HSLA Steel“. In Lecture Notes in Mechanical Engineering, 663–69. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8767-8_56.

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„Ripening among Nanoprecipitates“. In Kinetics in Nanoscale Materials, 99–117. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118743140.ch4.

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„Energy-filtered imaging of Cu-nanoprecipitates“. In Electron Microscopy and Analysis 2003, 255–58. CRC Press, 2004. http://dx.doi.org/10.1201/9781482269130-60.

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BERANGER, M., P. THEVENARD, R. BRENIER, B. CANUT, S. M. M. RAMOS, A. BRUNELLE, S. DELLA NEGRA, Y. LE BEYEC und E. BALANZAT. „Mixing effects by electronic processes in MgO containing Na nanoprecipitates bombarded with GeV heavy ions and 20 MeV cluster beams“. In Ion Beam Modification of Materials, 724–27. Elsevier, 1996. http://dx.doi.org/10.1016/b978-0-444-82334-2.50136-2.

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Konferenzberichte zum Thema "Nanoprecipitace"

Stegailov, Vladimir V., Alexey Yu Kuksin, Genri E. Norman, Alexey V. Yanilkin, Mark Elert, Michael D. Furnish, Ricky Chau, Neil Holmes und Jeffrey Nguyen. „ATOMISTIC STUDY OF NANOPRECIPITATES INFLUENCE ON PLASTICITY AND FRACTURE OF CRYSTALLINE METALS“. In SHOCK COMPRESSION OF CONDENSED MATTER - 2007: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2008. http://dx.doi.org/10.1063/1.2833049.

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Kuhr, Samuel J. M., M. F. Pinnell und Daniel Eylon. „Microstructural study of nanoprecipitates in RRA treated Al-7075 T6 using AFM/UFM/STEM“. In NDE for Health Monitoring and Diagnostics, herausgegeben von Norbert Meyendorf, George Y. Baaklini und Bernd Michel. SPIE, 2003. http://dx.doi.org/10.1117/12.484000.

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Medina-Almazán, A. Liliana, Lizandra S. Ovando-Ramírez, Rogelio Hernández-Callejas und Gonzalo Galicia-Aguilar. „Hardness and Microstructural Evolution of a JRQ A533 Cl.1 Steel Submitted to Thermal Annealing“. In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84916.

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RPV steels are industrial alloys with very complicated microstructures. The characterization of the evolution of microstructural features that can affect the hardness of this type of steel can provide information on parameters that may be considered for modeling the mechanical behavior of these materials. Thermal aging at temperatures higher than the operating temperatures of nuclear reactors may provide some information that could be related to enhanced diffusion irradiation effects. Thermal aging may also provide data about the evolution of RPV steels submitted to heat treatment within the temperature domain proposed for RPV thermal annealing. We present the results of heat treatments (450°C, 500°C, and 550°C) carried out on samples of an A533B Cl.1 (JRQ) steel up to 1000 h. JRQ steel has a heterogeneous microstructure, with well-separated ferrite and bainite islands observed at high magnification. The thermal aging of JRQ steel at 450°C, 500°C, and 550°C promoted an increase in hardness in both bainite and ferrite, with the increase more significant in bainite than in ferrite. For the thermal treatment at 550°C, a maximum of the density of precipitates (per μm2) in the treatments was observed over a period of 500 h. This coincides with the depletion of the alloying elements in the bainite matrix and a decrease of HV in bainite. Copper-rich nanoprecipitates (< 6 nm in size) were observed in the samples treated at 550°C for 500 and 1000 h. The Cu content in the nanoprecipitates increases with aging time. Finally, the HV of the samples treated at 550°C for up to 500 h is a function of the Geometrically Necessary Dislocation (GND) density, which was obtained from EBSD cartographies. GND density is at the same time a function of the density of the precipitates (40–300 nm in size).

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Medina Almazán, A. Liliana, Lizandra S. Ovando Ramírez und Thierry Auger. „Hardness and Microstructural Evolution of a JRQ A533 Cl.1 Steel Submitted to Thermal Annealing“. In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63303.

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For operation of existing nuclear power plants (NPPs) beyond their design lifetime (up to 80 years), one of th7e main issues is the assessment of the performance of its structures, systems and components (SSC) during the period of extended operation. The reactor pressure vessel (RPV) is one of the components that could determine the lifetime of a NPP. Neutron irradiation at the temperature of operation of the nuclear reactors facilitates the chemical equilibrium of the alloying elements of the RPV steels, especially copper, while producing nanoscale precipitates (Cu, Mn-Ni-Si, and ∼M6C carbides) that leads to embrittlement [1–4]; by the other side, neutron irradiation also produces dislocation loops. Both, nanoscale precipitates and dislocation loops, produce loss of toughness and hardness increase. One of the proposals to manage the RPV time life is the thermal annealing, however there are still some concerns about its application, one of them is a possible detrimental effect by the development of new microstructural features that could lead to thermal embrittlement. Thus it is important to have data about the microstructural and hardness evolution of the RPV steels submitted to thermal annealing treatments. The results of thermal treatments (450°C, 500°C and 550°C) performed in a A533 C1.1 (JRQ) steel during 0.5 to 1000 hours are presented in this work. JRQ steel has a bainitic microstructure, but well separated ferrite and bainite islands are observed at high magnification. The hardness evolution of such islands as a function of the thermal treatment is correlated with the number of precipitates present after thermal treatment as well as with the chemical evolution in these microconstituents. Thermal treatments of JRQ steel at 450, 500 and 550°C promoted the increase of hardness in both, bainite and ferrite. For the thermal treatment at 550°C, it is observed a maximum of the number of precipitates per μm2 in the treatments during 500 hours, which coincides with the depletion of the alloying elements in the bainite matrix and a decrease of Vickers microhardness (HV) in bainite. Cooper rich nanoprecipitates have been observed in the samples treated at 550°C during 500 and 1000 hours. The Cu content in the nanoprecipitates increase according the ageing time.

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Berichte der Organisationen zum Thema "Nanoprecipitace"

Hamilton, John C. Edge energies and shapes of nanoprecipitates. Office of Scientific and Technical Information (OSTI), Januar 2006. http://dx.doi.org/10.2172/902203.

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Tan, Lizhen, Ying Yang, Tianyi Chen, K. Sridharan und Li He. Design and screening of nanoprecipitates-strengthened advanced ferritic alloys. Office of Scientific and Technical Information (OSTI), Dezember 2016. http://dx.doi.org/10.2172/1341567.

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Tan, Lizhen, Ying Yang, Tianyi Chen, Kumar Sridharam und Li He. Mechanical Properties and Radiation Resistance of Nanoprecipitates-Strengthened Advanced Ferritic Alloys. Office of Scientific and Technical Information (OSTI), Dezember 2017. http://dx.doi.org/10.2172/1427634.

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Tan, Lizhen, Tianyi Chen, Ying Yang, Li He und Kumar Sridharan. Development of nanoprecipitates-strengthened advanced ferritic alloys for nuclear reactor applications. Office of Scientific and Technical Information (OSTI), Februar 2019. http://dx.doi.org/10.2172/1526385.

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Tan, Lizhen, Tianyi Chen, Ying Yang, Li He und Kumar Sridharan. Report on the down-selected nanoprecipitates-strengthened advanced ferritic alloys for nuclear reactor applications. Office of Scientific and Technical Information (OSTI), Februar 2019. http://dx.doi.org/10.2172/1506786.

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