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Kim, S.-H.; Lee, J.Y.; Ahn, J.-P.; Choi, P.-P. |
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Publication |
Fabrication of Atom Probe Tomography Specimens from Nanoparticles Using a Fusible Bi-In-Sn Alloy as an Embedding Medium |
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Journal Article |
Pages |
2019 |
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Abstract |
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Corporate Author |
Microscopy and Microanalysis |
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25 |
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Editor |
2 |
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Summary Language |
438-446 |
Series Editor |
atom probe tomography; fusible alloy; nanoparticles |
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Abbreviated Series Title |
We propose a new method for preparing atom probe tomography specimens from nanoparticles using a fusible bismuth-indium-tin alloy as an embedding medium. Iron nanoparticles synthesized by the sodium borohydride reduction method were chosen as a model system. The as-synthesized iron nanoparticles were embedded within the fusible alloy using focused ion beam milling and ion-milled to needle-shaped atom probe specimens under cryogenic conditions. An atom probe analysis revealed boron atoms in a detected iron nanoparticle, indicating that boron from the sodium borohydride reductant was incorporated into the nanoparticle during its synthesis. |
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Cambridge University Press |
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2019/02/04 |
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1431-9276 |
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NU @ karnesky @ |
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11534 |
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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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5 |
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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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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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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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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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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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no |
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NU @ karnesky @ |
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11195 |
| Permanent link to this record |
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Michler, Thorsten; Lee, Yongwon; Gangloff, Richard P.; Naumann, Joerg |
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Influence of macro segregation on hydrogen environment embrittlement of SUS 316L stainless steel |
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Journal Article |
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2009 |
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International Journal of Hydrogen Energy |
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34 |
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7 |
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3201-3209 |
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Hydrogen embrittlement; Austenitic stainless steel; Macro segregation; Nickel |
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The objective of this work is to identify microstructural variables that lead to the large scatter of the relative resistance of 316 grade stainless steels to hydrogen environment embrittlement. In slow displacement rate tensile testing, two almost identical (by nominal chemical composition) heats of SUS 316L austenitic stainless steel showed significantly different susceptibilities to HEE cracking. Upon straining, drawn bar showed a string-like duplex microstructure consisting of [alpha]'-martensite and [gamma]-austenite, whereas rolled plate exhibited a highly regular layered [alpha]'-[gamma] structure caused by measured gradients in local Ni content (9.5-13 wt%). Both martensite and austenite are intrinsically susceptible to HEE. However, due to Ni macro segregation and microstructural heterogeneity, fast H-diffusion in martensite layers supported a 10 times faster H-enhanced crack growth rate and thus reduced tensile reduction in area. Nickel segregation is thus a primary cause of the high degree of variability in H2 cracking resistance for different product forms of 316 stainless steel. |
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0360-3199 |
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no |
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NU @ karnesky @ |
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10957 |
| Permanent link to this record |
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Lee, S.-M.; Pyun, S.-I. |
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Effects of hydrogen redistribution on hydrogen-assisted cracking in Al-1.9% Li and Al-4.5% Zn-2.3% Mg alloys |
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Journal Article |
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1990 |
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Scripta Metallurgica et Materialia |
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24 |
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1629-1634 |
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NU @ karnesky @ |
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10238 |
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Lee, D.-H.; Hong, K.T.; Nam, S.W. |
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Intergraular fracture behavior of an Al-3at.%Mg solid solution alloy under the viscous glide creep condition |
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Journal Article |
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1991 |
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Scripta Metallurgica et Materialia |
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25 |
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823-828 |
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NU @ karnesky @ |
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10279 |
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Radmilovic, V.; Tolley, A.; Marquis, E.A.; Rossell, M.D.; Lee, Z.; Dahmen, U. |
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Monodisperse Al3(LiScZr) core/shell precipitates in Al alloys |
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Journal Article |
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2008 |
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Scripta Materialia |
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58 |
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7 |
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529-532 |
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Al alloy; Atom probe tomography (APT); Core/shell precipitates; Dispersion strengthening; Electron microscopy |
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We demonstrate a way of producing monodisperse Al3(LiScZr) core/shell inclusions using solid-state reactions. A uniform distribution of particles with a Li- and Sc-rich core surrounded by Li-rich shell a few nanometers thick with Zr segregating at the core/shell interface can be made reproducibly by exploiting kinetic and thermodynamic parameters. This approach to generating precipitate distributions can be applied to a range of alloys and could lead to new types of dispersion-strengthened materials. |
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no |
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NU @ karnesky @ 13381 |
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10202 |
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