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Park, Kyung-Tae; Hwang, Duck-Young; Lee, Young-Kook; Kim, Young-Kuk; Shin, Dong Hyuk |
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Publication |
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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Abstract |
Materials Science and Engineering A |
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Corporate Author |
Mater. Sci. Eng. A |
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Publisher |
341 |
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1-2 |
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Summary Language |
273-281 |
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High strain rate superplasticity; 5083 Al alloy; Scandium; Severe plastic deformation; Ultrafine grains |
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Abbreviated Series Title |
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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Lee, J. S.; Liu, K. S.; Chuang, F. Y.; Sun, C. Y.; Huang, C. M.; Lin, I. N. |
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Effect of Au buffer on the field emission characteristics of chemical vapor deposited diamond films |
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Journal Article |
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1997 |
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Applied Surface Science |
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Appl. Surf. Sci. |
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113-114 |
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264-268 |
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Field Emission |
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2446 |
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Kim, I. - S.; Hunn, J. D.; Hashimoto, N.; Larson, D. J.; Maziasz, P. J.; Miyahara, K.; Lee, E. H. |
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Defect and void evolution in oxide dispersion strengthened ferritic steels under 3.2 MeV Fe+ ion irradiation with simultaneous helium injection |
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Journal Article |
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2000 |
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Journal of Nuclear Materials |
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J. Nucl. Mater. |
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280 |
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264-274 |
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9024 |
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Bakhtizin, R. Z.; Valeev, V. G. |
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Microroughness field emission electron energy distribution and electron-phonon interaction spectroscopy near the metal surface |
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1988 |
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Physica Status Solidi A |
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Phys. Stat. Sol. A |
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108 |
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1 |
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251-255 |
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Field electron emission is considered from microtips on the metal surface. The possibility is shown of field emission spectroscopy of electron-phonon interaction near the emitting surface and the influence is studied of an increase in the surface potential barrier transparency by application of a weak high-frequency field altering the character of the field electron energy distribution in such a system. |
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4012 |
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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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Jung, J. H.; Ju, B. K.; Lee, Y. H.; Park, K. C.; Jang, J.; Jung, Y. H.; Kim, C. J.; Oh, M. H. |
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Emission stability of DLC coated metal-tips FEA |
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Journal Article |
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1996 |
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Int. Vac. Microelectron. Conf., 9th (1996), 231-234 Publisher: Nevskii Kur'er, St. Petersburg, Russia |
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231-234 |
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Field Emission |
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2004 |
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Ju, B. - K.; Park, H. - W.; Lee, Y. H.; Chung, I. - J.; Haskard, M. R.; Park, J. - H.; Oh, M. H. |
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Field emission properties of Mo-coated Si field emitter arrays and formation of molybdenum silicide |
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Journal Article |
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1996 |
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Int. Vac. Microelectron. Conf., 9th (1996), 221-225 Publisher: Nevskii Kur'er, St. Petersburg, Russia. |
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221-225 |
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Field Emission |
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2003 |
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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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2 |
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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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Jung, J. H.; Ju, B. K.; Lee, Y. H.; Jang, J.; Oh, M. H. |
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Enhancement of electron emission efficiency and stability of molybdenum-tip field emitter array by diamond like carbon coating |
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Journal Article |
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1997 |
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IEEE Electron Device Lett. |
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18 |
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197-199 |
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Field Emission |
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3140 |
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Donders, P. J.; Lee, M. J. G. |
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Thermal field emission and thermal photofield emission from tungsten (110) |
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Journal Article |
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1986 |
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Surface Science |
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Surf. Sci. |
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175 |
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197-214 |
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Field Emission |
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no |
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3528 |
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