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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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Abstract |
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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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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20 |
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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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5 |
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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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Kwon, H.; Barlat, F.; Lee, M.; Chung, Y.; Uhm, S. |
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Influence of Tempering Temperature on Low Cycle Fatigue of High Strength Steel |
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Journal Article |
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2014 |
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ISIJ International |
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54 |
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4 |
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979-984 |
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In this study, the mechanical and low cycle fatigue properties for a heat-treatment steel subjected to quenching and tempering (QT) were evaluated. The steel had a modified chemical composition with respect to a conventional material and was subjected to tempering at various temperatures. It was shown that the material tempered at 250°C exhibited superior fatigue properties in the short life regions. Carbon atom clusters in concentration of 18 at% in martensite were observed using atom probe tomography (APT) for the steel tempered at 250°C. It is believed that these clusters contribute to the improvement of fatigue properties by hindering the motion of dislocations. |
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NU @ karnesky @ |
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11486 |
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Lee, S.; Matsunaga, H.; Sauvage, X.; Horita, Z. |
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Strengthening of Cu–Ni–Si alloy using high-pressure torsion and aging |
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Journal Article |
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2014 |
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Materials Characterization |
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90 |
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62-70 |
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High-pressure torsion; Ultrafine grain; Cu–Ni–Si; Electrical conductivity; Apt |
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Abstract An age-hardenable Cu–2.9%Ni–0.6%Si alloy was subjected to high-pressure torsion. Aging behavior was investigated in terms of hardness, electrical conductivity and microstructural features. Transmission electron microscopy showed that the grain size is refined to ~ 150 nm and the Vickers microhardness was significantly increased through the HPT processing. Aging treatment of the HPT-processed alloy led to a further increase in the hardness. Electrical conductivity is also improved with the aging treatment. It was confirmed that the simultaneous strengthening by grain refinement and fine precipitation is achieved while maintaining high electrical conductivity. Three dimensional atom probe analysis including high-resolution transmission electron microscopy revealed that nanosized precipitates having compositions of a metastable Cu3Ni5Si2 phase and a stable NiSi phase were formed in the Cu matrix by aging of the HPT-processed samples and these particles are responsible for the additional increase in strength after the HPT processing. |
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1044-5803 |
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NU @ karnesky @ |
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11492 |
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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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Kim, Y.-C.; Adusumilli, P.; Lauhon, L.J.; Seidman, D.N.; Jung, S.-Y.; Lee, H.-D.; Alvis, R.L.; Ulfig, R.M.; Olson, J.D. |
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Three-dimensional atomic-scale mapping of Pd in Ni[sub:1 - x]Pd[sub:x]Si/Si(100) thin films |
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Journal Article |
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2007 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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91 |
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11 |
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113106:1-3 |
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annealing; interface roughness; nickel compounds; palladium compounds; rapid thermal processing; semiconductor-metal boundaries |
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Atom-probe tomography was utilized to map the three-dimensional distribution of Pd atoms in nickel monosilicide thin films on Si(100). A solid-solution Ni0.95Pd0.05 film on a Si(100) substrate was subjected to rapid thermal processing plus steady-state annealing to simulate the thermal processing experienced by NiSi source and drain contacts in standard complementary metal-oxide-semiconductor processes. Pd is found to segregate at the (Ni0.95Pd0.05)Si/Si(100) heterophase interface, which may provide a previously unrecognized contribution to monosilicide stabilization. The silicide-Si heterophase interface was reconstructed in three dimensions on an atomic scale and its chemical roughness was evaluated. |
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Aip |
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NU @ karnesky @ |
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9944 |
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