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Rogozhkin, S.V.; Aleev, A.A.; Zaluzhnyi, A.G.; Nikitin, A.A.; Iskandarov, N.A.; Vladimirov, P.; Lindau, R.; Möslang, A. |
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Atom probe characterization of nano-scaled features in irradiated ODS Eurofer steel |
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Journal Article |
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2011 |
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Journal of Nuclear Materials |
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409 |
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2 |
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Summary Language |
94-99 |
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ODS steel; ODS Eurofer; clusters; irradiation; fast neutron |
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Abbreviated Series Title |
Our previous investigations of unirradiated ODS Eurofer by tomographic atom probe (TAP) revealed numerous nano-scaled features (nanoclusters) enriched in vanadium, yttrium and oxygen. In this work the effect of neutron irradiation on nanostructure behaviour of ODS Eurofer (9%-CrWVTa) was investigated. The irradiation was performed in the research reactor BOR-60 (Dimitrovgrad, Russia) where materials were irradiated at 330°S to 32 dpa. TAP studies were performed on the needles prepared from parts of broken Charpy specimens. For all specimens except one, which was tested at 500°C, the Charpy tests were performed at temperatures not exceeding the irradiation temperature. A high number density 2÷4×1024 m-3 of ultra fine 1-3 nm diameter nanoclusters enriched in yttrium, oxygen, manganese and chromium was observed in the as-irradiated state. The composition of detected clusters differs from that for unirradiated ODS Eurofer. It was observed in this work that after neutron irradiation vanadium atoms had left the clusters, moving from the core into solid solution. The concentrations of yttrium and oxygen in the matrix, as it was detected, increase several times under irradiation. In the samples tested at 500°C both the number density of clusters and the yttrium concentration in the matrix decrease by a factor of two. |
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0022-3115 |
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NU @ karnesky @ |
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10946 |
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Rogozkin, S.; Chernobaeva, A.; Aleev, A.; Nikitin, A.; Zaluzhnyi, A.; Erak, D.; Shtrombakh, Ya.; Zabusov, O.; Debarberis, L.; Zeman, A. |
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The Effect of Post-Irradiation Annealing on VVER-440 RPV Materials Mechanolocal Properties and Nano-Structure Under Re-Irradiation |
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Journal Article |
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2009 |
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ASME Conference Proceedings |
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ASME Conf. Proc. |
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2009 |
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43703 |
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553-562 |
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The present work provides the analyses of embrittlement behavior and atom probe tomography study of nano-structure evolution of VVER-440 RPV materials under irradiation and re-irradiation. Specimens from VVER-440 weld with high level of cupper (0.16 wt.%) and phosphorus (0.027–0.038 wt.%) were irradiated in surveillance channels of Rovno Nuclear Power plant unit 1 (Ro-1). The embrittlement behavior has been assessed by transition temperature shift. |
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Asme |
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NU @ karnesky @ |
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10983 |
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Russell, K. C.; Barnett, D. M.; Altstetter, C. J.; Aaronson, H. I.; Lee, J. K. |
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Strain-Energy Interactions, the To Concept and Sympathetic Nucleation |
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1977 |
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Scripta Metallurgica |
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11 |
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6 |
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485-490 |
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Mit,Dept Mat Sci & Engn,Cambridge,Ma 02139
Michigan Technol Univ,Dept Met Engn,Houghton,Mi 49931
Stanford Univ,Dept Mat Sci & Engn,Stanford,Ca 94305
Univ Illinois,Dept Met & Min Engn,Urbana,Il 61801 |
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Times Cited: 8
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English
Cited References Count: 17
Dl496 |
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refbase @ user |
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1547 |
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Seol, J.; Lim, N.; Lee, B.; Renaud, L.; Park, C. |
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Atom probe tomography and nano secondary ion mass spectroscopy investigation of the segregation of boron at austenite grain boundaries in 0.5 wt.% carbon steels |
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Journal Article |
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2011 |
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Metals and Materials International |
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17 |
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3 |
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413-416 |
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Metallic Materials |
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The grain boundary segregation of boron atoms in high strength low alloy steels containing 50 ppm boron was accomplished using atom probe tomography (APT) and nano-beam secondary ion mass spectroscopy (SIMS). The formation of boro-carbides under an excessive addition of boron to the steels was identified through the SIMS and TEM. The APT was performed in order to evaluate the composition of the alloying elements, such as, boron and carbon, segregated at prior austenite grain boundaries. The boron contents at the prior austenite grain boundaries were approximately 1.7 ± 0.2 at.%, which was approximately 70 times more than the amount of boron added to the steels. |
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The Korean Institute of Metals and Materials, co-published with Springer Netherlands |
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1598-9623 |
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NU @ karnesky @ |
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11171 |
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Sinnott, Susan; Mao, Zugang; Lee, Kiho |
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Computational Studies of Molecular Diffusions through Carbon Nanotubes Based membrances (Invited) |
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Journal Article |
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2002 |
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Computer Modeling in Engineering and Science |
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3 |
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575-587 |
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Nanofluidics is an area that has been under study for some time in zeolites and idea nanoporous systems. Computational studies of the behavior of molecules in nanoporous structures have played an important role in understanding this phenomenon as experimental studies of molecular behavior in nanometer-scale pores are difficult to perform. in this paper computational work to study molecular motion and the separation of molecular mixtures in carbon nanotube systems is reported. The systems examined include organic molecules, such as CH4, C2H6, n-C4H10, and i-c4H10, and inorganic molecules, such as CO2. The interatomic forces in the molecular dynamics simulations are calculated using a classical reactive empirical bond order hydrocarbon potetial coupled to lernard-Jones and coulombic potentials. Molecules moving at thermal velocities corresponding to 300K are predicted to diffuse from areas of high density to areas of low density through the nanotubes. The simulations indicate how the structure and size of molecules and the nanotubes influence molecular diffusion through the nanotubes and the separation of the molecular mixtures. |
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NU @ z-mao2 @ |
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198 |
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Suh,Dong-Woo; Lee, Sang-Yong; Lee, Kyong-Hwan; Lim, Su-Keun; Oh, Kyu Hwan |
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Microstructural evolution of Al–Zn–Mg–Cu–(Sc) alloy during hot extrusion and heat treatments |
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Journal Article |
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2004 |
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Journal of Materials Processing Technology |
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155-156 |
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1330-1336 |
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Scandium; Microstructure; Recovery; Recrystallization |
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The microstructural evolution during hot extrusion and post heat treatment was investigated for two kind of Al–Zn–Mg–Cu–(Sc) alloy and AA7075. The microstructure of as-extruded bar is mainly comprised of recovered structure for all alloys, however, different restoration processes are observed during post heat treatment. For AA7075 and S1, which contains 0.1% Sc with relatively higher Zn and Cu content than S2, recovery still proceeds during the heat treatment, while the recrystallization becomes main restoration process during the heat treatment for S2.
The differences in abnormal grain growth and hardening behavior between S1, AA7075 and S2 during the heat treatment are discussed in connection with the restoration processes and resultant microstructures. |
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NU @ karnesky @ |
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622 |
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Tewari, S.N.; Vijayakumar, M.; Lee, J.E.; Curreri, P.A. |
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Solutal partition coefficients in nickel-based superalloy PWA-1480 |
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Journal Article |
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1991 |
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Materials Science and Engineering A |
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141 |
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1 |
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97-102 |
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Solutal profiles in dendritic single-crystal specimens of PWA-1480 nickel-base superalloy, which were directionally solidified and quenched, were examined on several transverse cross-sections to obtain the partition coefficients. Similar to their nickel-base binaries, the partition coefficients of tantalum, titanium, and aluminum were found to be less than unity; those of tungsten and cobalt were greater than unity. The partition coefficients were temperature independent in the range 1584-1608 K. The contribution of solid-state diffusion to microsegregation was observed to be negligible. |
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NU @ karnesky @ |
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9820 |
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Tomaszewska, Agnieszka; Shim, Hyungjoon; Ahn, Chanmo; Lee, Geunseop |
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Reinvestigation of the alkali-metal-induced Ge(1 1 1)3×1 reconstruction on the basis of boundary structure observations |
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Journal Article |
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2011 |
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Ultramicroscopy |
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Special Issue: 52nd International Field Emission Symposium |
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111 |
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6 |
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392-396 |
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Alkali-metal adsorption; Ge(1 1 1); Surface reconstruction; HCC model; Stm |
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We have investigated the surface atomic structure of boundary area of Li- and Na-induced Ge(1 1 1)3×1 reconstruction using scanning tunneling microscope. On Li/Ge(1 1 1)3×1, the 3×1 phase was found to be terminated with a single row in the filled-state image and with dimer-like features in the empty-state image. The images of both interior and boundary of the Li/Ge(1 1 1)3×1 surface are compatible with the honeycomb-chain-channel (HCC) model, which has substrate atoms with double bonds and is well established as the structure of AM/Si(1 1 1)3×1 surfaces. In contrast, termination with zigzag double rows at the domain boundary edges was observed in the filled-state images of the Na/Ge(1 1 1)3×1 phase, which is not reconcilable with the HCC structure. The filled-state STM feature of the boundary region of the Na/Ge(1 1 1)3×1 phase supports a structural model not having Ge=Ge double bonds, which was proposed to interpret its empty-state images. The trend of bondings between atoms in the surface layer of the AM-induced 3×1 reconstruction of Si and Ge is discussed in terms of electronegativity differences. |
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0304-3991 |
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NU @ karnesky @ |
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11195 |
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Uh, H. S.; Kwon, S. J.; Lee, J. D. |
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Process design and emission properties of gated n+ polycrystalline silicon field emitter arrays for flat-panel display applications |
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Journal Article |
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1997 |
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Journal of Vacuum Science & Technology A |
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J. Vac. Sci. Technol. A |
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B15 |
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472-476 |
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Field Emission |
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2491 |
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Uh, H. S.; Kwon, S. J.; Lee, J. D. |
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A novel fabrication process of a silicon field emitter array with thermal oxide as a gate insulator |
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Journal Article |
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1995 |
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IEEE Electron Device Lett. |
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16 |
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488-490 |
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Field Emission |
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2731 |
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