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Lee, C. R. A., N A; Patel, C. |
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Wet etching of cusp structures for field-emission devices |
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1989 |
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IEEE Trans. Electr. Devices |
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36 |
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Field Emission |
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4792 |
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Lee, R. A.; Patel, C.; Williams, H. A.; Cade, N. A. |
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Semiconductor fabrication technology applied to micrometer valves |
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Journal Article |
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1989 |
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IEEE Trans. Electr. Devices |
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36 |
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Field Emission |
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4840 |
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Han, B.Q.; Lee, Z.; Witkin, D.; Nutt, S.; Lavernia, E.J. |
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Deformation behavior of bimodal nanostructured 5083 Al alloys |
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Journal Article |
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2005 |
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Metallurgical And Materials Transactions A-Physical Metallurgy And Materials Science |
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Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. |
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36a |
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4 |
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957-965 |
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Cryomilled 5083 At alloys blended with volume fractions of 15, 30, and 50 pct unmilled 5083 At were produced by consolidation of a mixture of cryomilled 5083 At and Unmilled 5083 A] powders. A bimodal grain size was achieved in the as-extruded alloys in which nanostructured regions had a grain size of 200 nm and coarse-grained regions had a grain size of I µm. Compression loading in the longitudinal direction resulted in elastic-perfectly plastic deformation behavior. An enhanced tensile elongation associated with the occurrence of a Luders band was observed in the bimodal alloys. As the volume fraction of coarse grains was increased, tensile ductility increased and strength decreased. Enhanced tensile ductility was attributed to the occurrence of crack bridging as well as delamination between nanostructured and coarse-grained regions during plastic deformation. |
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Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA, Email: bqhan@ucdavis.edu |
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Minerals Metals Materials Soc |
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English |
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1073-5623 |
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ISI:000227914900007 |
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NU @ karnesky @ |
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10025 |
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Park, J.H.; Lee, Y.S.; Nam, W.J.; Park, K.T. |
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Comparison of compressive deformation of ultrafine-grained 5083 Al alloy at 77 and 298 K |
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Journal Article |
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2005 |
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Metallurgical And Materials Transactions A-Physical Metallurgy And Materials Science |
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Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. |
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36a |
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5 |
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1365-1368 |
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The compression behaviors of well-annealed coarse-grained (CG) and ultrafine-grained (UFG) 5083 Al alloys at 77 and 298 K were compared. For the CG alloy, stage II and III strain hardening were dominant at 77 and 298 K, respectively, depending on the completeness of dislocation cell formation. The UFG alloy exhibited the elastic-near perfectly plastic behavior without distinctive dislocation cell formation at both temperatures. For both alloys, the flow stress at 77 K was much higher than that at 298 K. |
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Hanbat Natl Univ, Div Adv Mat Sci & Engn, Taejon 305719, South Korea, Email: ktpark@hanbat.ac.kr |
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Minerals Metals Materials Soc |
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English |
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1073-5623 |
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ISI:000228797500029 |
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NU @ karnesky @ |
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10027 |
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Harvey, R. J.; Lee, R. A.; Miller, A. J.; Wigmore, J. K. |
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Aspects of field emission from silicon diode arrays |
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Journal Article |
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1991 |
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IEEE Transactions on Electron Devices |
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IEEE Trans. Electron Devices |
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38 |
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Field Emission |
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4547 |
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Veerababu, R.; Balamuralikrishnan, R.; Muraleedharan, K.; Srinivas, M. |
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Three-dimensional atom probe investigation of microstructural evolution during tempering of an ultra-high-strength high-toughness steel |
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Journal Article |
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2008 |
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Metallurgical And Materials Transactions A-Physical Metallurgy And Materials Science |
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Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. |
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39a |
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7 |
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1486-1495 |
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The evaluation of the tempering response of an ultra-high-strength, high-toughness (UHSHT) steel revealed that samples austenitized at 900 degrees C and tempered for 4 and 8 hours at 485 degrees C had similar yield strengths but a similar to 50 pct increase in fracture toughness for the 8-hour temper. The results of our investigations of microstructural origins of this difference, using the nanometric scale resolution of the three-dimensional atom probe (3DAP) suggest that nanoscale strengthening precipitates, essentially carbides and intermetallic clusters (containing primarily Cr and Mo atoms), are present in both samples. The chemical compositions of the particles in the two samples were found to be similar, but clear evidence of differences in physical attributes of the precipitates, such as particle size, morphology, and interparticle spacing, are seen. |
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Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India, Email: muraleek@hotmail.com |
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Springer |
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English |
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1073-5623 |
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ISI:000256081500004 |
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NU @ m-krug @ |
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10377 |
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Donders, P. J.; Lee, G., M J |
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Observation of electron-hole cascade in photofield emission |
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Journal Article |
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1990 |
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Physical Review |
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Phys. Rev. |
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B41 |
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Field Emission |
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4368 |
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Ahmad, Zaki; Ul-Hamid, Anwar; B.J., Abdul-Aleem |
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The corrosion behavior of scandium alloyed Al 5052 in neutral sodium chloride solution |
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Journal Article |
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2001 |
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Corrosion Science |
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43 |
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7 |
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1227-1243 |
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Corrosion; Al–Mg–Sc; Age-hardening; Microstructure; Pitting potential; Polarization |
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Alloying with scandium has a strong influence on the strengthening and weight saving characteristics of Al–2.5Mg alloys. Scandium addition (0.1–0.3 wt.%) to Al–2.5Mg alloys does not introduce any appreciable loss in their resistance to corrosion in 3.5 wt.% NaCl. The corrosion behavior of these alloys is not significantly affected by age hardening. Because of a unique combination of outstanding mechanical properties and a good resistance to corrosion Al–Mg alloys containing scandium represent a major improvement over the more familiar Al–Mg alloys. |
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NU @ karnesky @ |
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435 |
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Muraleedharan, K.; Balamuralikrishnan, R.; Das, N. |
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TEM and 3D atom probe characterization of DMS4 cast nickel-base superalloy |
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Journal Article |
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2009 |
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Journal of Materials Science |
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J. Mater. Sci. |
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44 |
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2218-2225 |
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Cast nickel-base superalloys possess the required mechanical properties (creep resistance and stress rupture life) at elevated temperatures that make them suitable for turbine blades in aero-engines. The origin of these properties lies in the presence of a simple two phase [gamma]-[gamma]' microstructure (with cuboidal [gamma]' particles dispersed in a [gamma] matrix), in spite of the presence of several alloying elements. The cuboidal nature of the [gamma]' particles arises from an optimal misfit between the two phases, which is a function of the composition of [gamma] and [gamma]' phases. In addition, several microstructural issues arising out of the partitioning of the alloying elements influences directly the deformation mechanisms in the [gamma] and [gamma]', and therefore the mechanical properties of the alloy. In this article, we discuss how some of these microstructural issues have been investigated in DMS4, a cast single crystal superalloy, experimentally using TEM and 3DAP techniques. |
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NU @ karnesky @ |
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10534 |
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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 |
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