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Han, B.Q.; Lee, Z.; Witkin, D.; Nutt, S.; Lavernia, E.J. |
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Publication |
Deformation behavior of bimodal nanostructured 5083 Al alloys |
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Journal Article |
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2005 |
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Abstract |
Metallurgical And Materials Transactions A-Physical Metallurgy And Materials Science |
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Corporate Author |
Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. |
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36a |
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4 |
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Summary Language |
957-965 |
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Abbreviated Series Title |
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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Series Issue |
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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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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no |
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NU @ karnesky @ |
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10027 |
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Ko, C. G.; Ju, B. K.; Lee, Y. H.; Park, J. H.; Oh, M. H. |
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Fabrication and characterization of diamond-like carbon coated knife edge 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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L1305-L1307 |
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Field Emission |
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2232 |
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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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Donders, P. J.; Lee, M. J. G. |
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Coulomb scattering in field and photofield emission |
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Journal Article |
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1987 |
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Physical Review |
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Phys. Rev. |
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B35 |
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Field Emission |
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3805 |
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Lee, H. C.; Huang, R. S. |
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A study on field-emission array pressure sensors |
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Journal Article |
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1992 |
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Sens. Actuators |
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A34 |
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Field Emitters |
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5076 |
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Anderson, C. R.; Lee, R. N. |
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Accurate measurements of electron energies by field-emitter referencing |
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Journal Article |
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1984 |
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Journal of Electron Spectroscopy and Related Phenomena |
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J. Electron Spectrosc. Relat. Phenom. |
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34 |
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2 |
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173-198 |
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A new technique of electron Spectroscopy is described in which a standard electron spectrometer is used to compare the electron energy to be measured with the energies of electrons from a field-emitter reference source. Since the reference electrons are emitted at the Fermi level of the emitter tip, their total energy can be accurately measured with a high precision digital voltmeter. The measurements are automatically referenced to the absolute scale of energies and the need for calibration standards is eliminated. The application of the technique to X-ray photoelectron Spectroscopy (XPS) is described. Detailed analysis shows that the uncertainty in the field-emitter referenced XPS measurements is ± 0.06 electron volts. |
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8497 |
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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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NU @ karnesky @ |
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10957 |
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Koops, P., H W; Kretz, J.; Rudolph, M.; Weber, M.; Dahm, G.; Lee, K. L. |
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Characterization and application of materials grown by electron-beam-induced deposition |
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Journal Article |
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1994 |
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Japanese Journal of Applied Physics |
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Jpn. J. Appl. Phys. |
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33 |
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7099-7107 |
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Scanning Tunnelling Microscopy |
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no |
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3083 |
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Lee, W.-B.; Hong, S.-G.; Park, C.-G.; Park, S.-H. |
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Carbide precipitation and high-temperature strength of hot-rolled high-strength, low-alloy steels containing Nb and Mo |
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Journal Article |
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2002 |
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Metallurgical and Materials Transactions A |
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33 |
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6 |
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1689-1698 |
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Abstract The effects of a Mo addition on both the precipitation kinetics and high-temperature strength of a Nb carbide have been investigated in the hot-rolled high-strength, low-alloy (HSLA) steels containing both Nb and Mo. These steels were fabricated by four-pass hot rolling and coiling at 650C, 600C, and 550C. Microstructural analysis of the carbides has been performed using field-emission gun transmission electron microscopy (TEM) employing energy-dispersive X-ray spectroscopy (EDS). The steels containing both Nb and Mo exhibited a higher strength at high temperatures (∼600 C) in comparison to the steel containing only Nb. The addition of Mo increased the hardenability and led to the refinement of the bainitic microstructure. The proportion of the bainitic phase increased with the increase of Mo content. The TEM observations revealed that the steels containing both Nb and Mo exhibited fine (<10 nm) and uniformly distributed metal carbide (MC)-type carbides, while the carbides were coarse and sparsely distributed in the steels containing Nb only. The EDS analysis also indicated that the fine MC carbides contain both Nb and Mo, and the ratio of Mo/Nb was higher in the finer carbides. In addition, electron diffraction analysis revealed that most of the MC carbides had one variant of the B-N relationship ((100)MC//(100)ferrite, [011]MC//[010]ferrite) with the matrix, suggesting that they were formed in the ferrite region. That is, the addition of Mo increased the nucleation sites of MC carbides in addition to the bainitic transformation, which resulted in finer and denser MC carbides. It is, thus, believed that the enhanced high-temperature strength of the steels containing both Nb and Mo was attributed to both bainitic transformation hardening and the precipitation hardening caused by uniform distribution of fine MC particles. |
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no |
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NU @ p-kolli @ |
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9838 |
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