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Moon, K. I.; Kim, S. C.; Lee, K. S. |
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A Study on the Microstructure of {D0$_{23}$ Al$_3$Zr and L1$_2$ (Al+12.5 at.% Cu)$_3$Zr} Intermetallic Compounds Synthesized by {PBM and SPS} |
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2002 |
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Abstract |
Intermetallics |
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10 |
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2 |
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185-194 |
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refbase @ user |
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1424 |
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Moon, K. I.; Lee, S. H.; Seon, J. K. |
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The Effect of {Cu and Zn} on the Phase Stability of {L1$_2$ Al$_3$Hf} Intermetallic Compound Synthesized by Mechanical Alloying |
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Journal Article |
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2002 |
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Intermetallics |
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10 |
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8 |
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793-800 |
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refbase @ user |
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1425 |
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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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9 |
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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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Park, H. - W.; Ju, B. - K.; Lee, Y. - H.; Kang, I. - B.; Samaan, N.; Haskard, M. R.; Park, J. - H.; Oh, M. - H. |
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Direct bonding between spacer and field emitter array using an electron-beam evaporated interlayer |
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Journal Article |
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1997 |
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Proc. SPIE-Int. Soc. Opt. Eng. 3046 (Smart Electronics and MEMS) (1997) 328-335 |
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328-335 |
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Field Emission |
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2542 |
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Park, H. - W.; Ju, B. - K.; Lee, Y. - H.; Park, J. - H.; Oh, M. - H. |
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Emission characteristics of the molybdenum-coated silicon field emitter array |
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Journal Article |
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1996 |
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Japanese Journal of Applied Physics |
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Jpn. J. Appl. Phys. |
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35 |
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L1301-L1304 |
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Field Emission |
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2236 |
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Park, J. - Y.; Choi, H. - J.; Lee, Y.; Kang, S.; Chun, K.; Park, S. W.; Kuk, Y. |
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Construction of STM aligned electron field emission source |
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Journal Article |
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1996 |
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Journal de Physique IV |
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J. de Phys. IV |
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6-C5 |
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285-289 |
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Scanning Tunnelling Microscopy |
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2146 |
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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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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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Park, K. H.; Lee, S.; Koh, K. H.; Park, J. I.; Park, K. J.; Takaya, M. |
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Field emission characteristics of diamond films |
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Journal Article |
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1996 |
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Han'guk Pyomyon Konghak Hoechi |
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29 |
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505-511 |
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Field Emission |
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2029 |
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Park, Kyung-Tae; Hwang, Duck-Young; Lee, Young-Kook; Kim, Young-Kuk; Shin, Dong Hyuk |
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High strain rate superplasticity of submicrometer grained 5083 Al alloy containing scandium fabricated by severe plastic deformation |
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Journal Article |
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2003 |
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Materials Science and Engineering A |
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Mater. Sci. Eng. A |
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341 |
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1-2 |
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273-281 |
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High strain rate superplasticity; 5083 Al alloy; Scandium; Severe plastic deformation; Ultrafine grains |
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High strain rate superplasticity (HSRS) was obtained in a commercial 5083 Al alloy by introducing a ultrafine grained structure of 0.3 small mu, Greekm through severe plastic deformation and by adding a dilute amount of scandium (Sc) as a microstructure stabilizer. Tensile tests were carried out on the as-processed sample at temperatures of 623–823 K and initial strain rates of 1×10−3–1×100 s−1. The maximum elongation to failure of 740% was obtained at 773 K and 1×10−2 s−1. HSRS of the alloy was attributed to the combined effects of dynamic recrystallization and preservation of fine recrystallized grains by the presence of Sc. The mechanical behavior of the alloy at 773 K was characterized by a sigmoidal behavior in a plot of stress vs strain rate in the double logarithmic scale. The origin of the sigmoidal behavior was discussed in terms of microstructural evolution during superplastic deformation. An examination of the fractured samples revealed that failure occurred in a brittle manner related to cavitation rather than necking. Cavity stringers were formed parallel to the tensile axis by interlinkage of jagged-shaped isolated cavities along grain boundaries aligned to the tensile axis. |
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NU @ karnesky @ |
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585 |
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