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Kratschmer, E.; Kim, H. S.; Thomason, R., M G; Lee, K. Y.; Rishton, S. A.; Yu, M. L.; Chang, P., T H |
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Sub-40 nm resolution 1 keV scanning tunneling microscope field-emission microcolumn |
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Journal Article |
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1994 |
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Abstract |
Journal of Vacuum Science & Technology A |
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J. Vac. Sci. Technol. A |
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B12 |
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Summary Language |
3503-3507 |
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Scanning Tunnelling Microscopy |
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3354 |
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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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Lagow, B.W.; Robertson, I.M.; Jouiad, M.; Lassila, D.H.; Lee, T.C.; Birnbaum, H.K. |
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Observation of dislocation dynamics in the electron microscope |
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Journal Article |
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2001 |
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Materials Science And Engineering A |
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Mater. Sci. Eng. A |
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309-310 |
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445-450 |
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Deformation experiments performed in situ in the transmission electron microscope have led to an increased understanding of dislocation dynamics. To illustrate the capability of this technique two examples will be presented. In the first example, the processes of work hardening in Mo at room temperature will be presented. These studies have improved our understanding of dislocation mobility, dislocation generation, and dislocation-obstacle interactions. Zn the second example, the interaction of matrix dislocations with grain boundaries will be described. From such studies predictive criteria for slip transfer through grain boundaries have been developed. |
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0921-5093 |
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WOS:000169044600089 |
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NU @ m-krug @ |
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10533 |
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Lee, B.; Barasch, E. F.; Mazumdar, T.; McIntyre, P. M.; Pang, Y.; Trost, H. - J. |
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Development of knife-edge field emission cathodes on (110) silicon wafers |
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Journal Article |
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1993 |
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Applied Surface Science |
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Appl. Surf. Sci. |
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67 |
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Field Emission Microscopy |
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5390 |
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Lee, B.; Elliott, T. S.; Mazumdar, T. K.; McIntyre, P. M.; Pang, Y.; Trost, H. - J. |
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Knife-edge thin film field emission cathodes on (110) silicon wafers |
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Journal Article |
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1994 |
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Journal of Vacuum Science & Technology A |
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J. Vac. Sci. Technol. A |
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B12 |
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644-647 |
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Field Emission |
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3238 |
| Permanent link to this record |
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Lee, B.; Min, S. - W.; Bang, J. - H.; Hwang, D. - S.; Kwon, T. - J. |
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Modeling of tunneling current at field emission display tips: for non-metallic tips and an analytic method of solving for electric fields |
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Journal Article |
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1996 |
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Int. Vac. Microelectron. Conf., 9th (1996), 97-101 Publisher: Nevskii Kur'er, St. Petersburg, Russia |
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97-101 |
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Field Emission |
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2011 |
| Permanent link to this record |
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Lee, B.C.; Park, J.K. |
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Effect of the addition of Ag on the strengthening of Al3Li phase in Al-Li single crystals |
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Journal Article |
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1998 |
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Acta Materialia |
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46 |
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12 |
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4181-4187 |
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The variation of the critical resolved shear stress as a function of aging condition has been measured in ternary Al-~(1.9-2.0) wt% Li-~0.4 wt% Ag single crystals and has been analyzed using the same version of order-hardening theory as in our previous work in binary single crystals. The result showed that the antiphase boundary energy of the Al3Li lattice on {111} definitively increases from about 0.118 J/m2 in binary crystals to 0.128+/-0.012 J/m2 in ternary crystals, in good agreement with the analysis of the transition behavior from shearing to looping and of the dislocation pair spacings. A strong segregation tendency of Ag into the Al3Li lattice is believed to be responsible for this increment. Our previous result of [gamma]apb (0.118+/-0.006 J/m2) in binary crystals is, although unlikely from the recent suggestion of Nembach, the best value one can obtain from the recent knowledge of order-hardening theory. This is slightly larger than that (about 0.100 J/m2) obtained from the analysis of the transition from shearing to looping and somewhat larger than the result (about 0.085 J/m2) of the first-principles calculation. Three factors are discussed as principal causes of a possibility of an overestimation of [gamma]apb on applying order-hardening theory. |
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NU @ karnesky @ |
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9941 |
| Permanent link to this record |
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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 |
| Permanent link to this record |
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Lee, C. G.; Ahn, H. Y.; Lee, J. D. |
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Scaling-down of cone-like field emitter using LOCOS |
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Journal Article |
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1995 |
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Tech. Dig. |
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401-404 |
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Field Emission |
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2460 |
| Permanent link to this record |
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Lee, C. G.; Ahn, H. Y.; Lee, J. D.; Park, H. S. |
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A new approach to manufacturing field emitter arrays with submicron gate apertures |
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Journal Article |
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1995 |
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Tech. Dig. |
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14-17 |
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Field Emission |
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2841 |
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