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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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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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NU @ karnesky @ |
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10983 |
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Darling, K.A.; VanLeeuwen, B.K.; Semones, J.E.; Koch, C.C.; Scattergood, R.O.; Kecskes, L.J.; Mathaudhu, S.N. |
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Stabilized Nanocrystalline Iron-based Alloys: Guiding Efforts in Alloy Selection |
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Journal Article |
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2011 |
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Materials Science and Engineering: A |
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In Press |
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Accepted Manuscript |
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Mechanical Alloying; Grain Growth; Interfaces; Recrystallization and Nanostructured Materials |
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Using a modified regular solution model for grain boundary solute segregation, the relative thermal stability of a number of Fe-based nanocrystalline binary alloys was predicted with considerable accuracy. It was found that nanocrystalline iron was strongly stabilized by zirconium, moderately stabilized by tantalum, and not significantly stabilized by nickel or chromium. These findings are fully in line with the aforementioned predictions. This success with iron based alloys highlights the utility of this practical approach to selecting stabilizing solutes for nanocrystalline alloys. |
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0921-5093 |
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NU @ karnesky @ |
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11038 |
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Kim, Jeong Kil; Kim, Yeong Ho; Lee, Bong Ho; Kim, Kyoo Young |
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New findings on intergranular corrosion mechanism of stabilized stainless steels |
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Journal Article |
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2011 |
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Electrochimica Acta |
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ADVANCES IN CORROSION SCIENCE FOR LIFETIME PREDICTION AND SUSTAINABILITYSelection of papers from the |
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56 |
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4 |
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1701-1710 |
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Intergranular corrosion; Stainless steel; Stabilizer effect; Segregation; Chromium |
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Number of different sets of stabilized both ferritic and austenitic stainless steels with various alloying elements were evaluated to verify new findings on the intergranular corrosion mechanism. The intergranular segregation and precipitation were analyzed by using a transmission electron microscopy with an energy dispersive X-ray spectroscopy and a laser assisted three-dimensional atom probe. On the basis of the current result, it is newly proposed that the intergranular corrosion occurring in the stabilized both ferritic and austenitic stainless steels is induced by Cr-depletion due to segregation of un-reacted Cr atoms around carbides of stabilizer elements (Ti or Nb) along the grain boundary, but not due to formation of Cr-carbide. A prevention method for this type of intergranular corrosion is also suggested after critical evaluation on the effect of Cr, C, and Ni. |
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0013-4686 |
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NU @ karnesky @ |
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11057 |
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Mao, Zugang; Kim, Yeong-Cheol; Lee, Hi-Deok; Adusumilli, Praneet; Seidman, David N. |
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NiSi crystal structure, site preference, and partitioning behavior of palladium in NiSi(Pd)/Si(100) thin films: Experiments and calculations |
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Journal Article |
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2011 |
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Applied Physics Letters |
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99 |
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013106 |
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ab initio calculations; crystal structure; metallic thin films; nickel alloys; palladium alloys; silicon alloys; tomography; X-ray diffraction |
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The crystal structure of a NiSi thin-film on a Si substrate and Pd site-substitution in NiSi and the partitioning behavior of Pd for NiSi(Pd)/Si(100) are investigated by x-ray diffraction (XRD), first-principles calculations, and atom-probe tomography (APT). The NiSi layer is a distorted orthorhombic structure from XRD patterns via experiments and calculations. We find that Pd has a strong driving force, 0.72 eV atom−1, for partitioning from Si into the orthorhombic NiSi layer. The calculated substitutional energies of Pd in NiSi indicate that Pd has a strong preference for Ni sublattice-sites, which is in agreement with concentration profiles determined by APT. |
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Aip |
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0003-6951 |
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NU @ karnesky @ ref10.1063/1.3606536 |
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11169 |
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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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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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Rogozhkin, S.; Aleev, A.; Zaluzhnyi, A.; Kuibida, R.; Kulevoi, T.; Nikitin, A.; Orlov, N.; Chalykh, B.; Shishmarev, V. |
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Effect of irradiation by heavy ions on the nanostructure of perspective materials for nuclear power plants |
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Journal Article |
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2012 |
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The Physics of Metals and Metallography |
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113 |
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200-211 |
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Chemistry and Materials Science |
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An imitation experimental technique on the irradiation with heavy ions of structural materials of nuclear power plants using tomographic atom probe analysis has been elaborated. The scheme of irradiation of specimens for atom probe analysis has been realized on a MEVVA ion source of an TIPr accelerator (ITEP) with ion energy 75 keV per charge. Test experiments with irradiation and analysis of samples of the EK-181 steel by aluminum ions to a fluence of ~2 × 10 15 ion/cm 2 have been performed. Experiments on the Fe-ion irradiation of the samples of ODS EUROFER perspective steel for fission and fusion reactors to different damaging doses have been carried out. The analysis of distribution of different chemical elements in the volumes tested has revealed that under ion irradiation a change in the composition of nanosized clusters, which are present in the initial material takes place. Comparison of the data obtained with the results of reactor irradiation of the ODS EUROFER steel has been carried out. These data testify a correspondence between nanoscale changes in the steels oxide dispersion strengthened in imitation experiments and under the conditions of reactor irradiation. |
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MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC. |
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0031-918x |
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NU @ karnesky @ |
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11334 |
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Lee, Byeong-Joo; Jang, Je-Wook |
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A modified embedded-atom method interatomic potential for the Fe–H system |
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Journal Article |
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2007 |
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Acta Materialia |
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55 |
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6779-6788 |
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Modified embedded-atom method; Iron–hydrogen alloys; Atomistic simulation; Molecular dynamics; Lattice defect |
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A modified embedded-atom method (MEAM) interatomic potential for the Fe–H binary system has been developed using previously developed MEAM potentials of Fe and H. The potential parameters were determined by fitting to experimental data on the dilute heat of solution of hydrogen in body-centered cubic (bcc) and face-centered cubic (fcc) Fe, the vacancy–hydrogen binding energy in bcc Fe, and to a first-principles calculation for the lattice parameter and bulk modulus of a hypothetical NaCl-type FeH. The potential accurately reproduces the known physical properties of hydrogen as an interstitial solute element in bcc and fcc Fe. The applicability of the potential to atomistic approaches for investigating interactions between hydrogen atoms and other defects such as vacancies, dislocations and grain boundaries, and also for investigating the effects of hydrogen on various deformation and mechanical behaviors of iron is demonstrated. |
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1359-6454 |
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NU @ karnesky @ |
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11399 |
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Park, Jin Ho; Kim, Jeong Kil; Lee, Bong Ho; Kim, Sang Seok; Kim, Kyoo Young |
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Three-dimensional atom probe analysis of intergranular segregation and precipitation behavior in Ti-Nb-stabilized low-Cr ferritic stainless steel |
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Journal Article |
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2013 |
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Scripta Materialia |
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68 |
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237-240 |
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3-D atom probe; Intergranular corrosion; Segregation; Precipitation; Stainless steel |
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Sequential phenomena of intergranular segregation and precipitation in Ti-Nb-stabilized 11 wt.% Cr ferritic stainless steel have been investigated. During aging, C and Ti diffuse into the grain boundary before Nb and Cr and form TiC preferentially. The solute Cr atoms segregate along the grain boundary, consequently resulting in Cr depletion in the vicinity of the grain boundary. |
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1359-6462 |
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NU @ karnesky @ |
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11426 |
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Y.K. Chen-Wiegart, S. Wang, W.K. Lee, I. McNulty, P.W. Voorhees, D.C. Dunand |
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In situ Imaging of Dealloying during Nanoporous Gold Formation by Transmission X-ray Microscopy |
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Journal Article |
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2013 |
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Acta Materialia |
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61 |
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1118-1125 |
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NU @ michaeljsrawlings @ |
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11454 |
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