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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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Abstract  |
Metallurgical and Materials Transactions A |
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33 |
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6 |
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Summary Language |
1689-1698 |
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Abbreviated Series Title |
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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NU @ p-kolli @ |
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9838 |
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Lee, H. S.; Han, S. Z.; Lee, H. M.; Lee, Z. H. |
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Coarsening Behavior of L1$_2$ Precipitates in Melt-Spun Al-Ti-V-Zr Alloys |
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Journal Article |
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1993 |
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Materials Science and Engineering A |
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Mater. Sci. Eng. A |
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163 |
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1 |
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81-90 |
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volume fraction
high-strength
kinetics
dependence
nucleation
growth
do22 |
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Aging studies of two melt-spun Al-2at.% (Ti,V,Zr) alloys showed that the would-be metastable L1(2) Al3(Ti,V,Zr) precipitates did not transform to stable D0(23) ones, and the average radius is 5-7 nm and the interparticle spacing is 20-40 nm at 698 K up to 400 h. The coarsening rate of spherical Al3(Ti0.2V0.4Zr0.4) precipitates was observed to be five times as fast as that of Al3(Ti0.1V0.4Zr0.5) precipitates. The coarsening behavior in both alloys obeyed the Lifshitz-Slyozov-Wagner (LSW) prediction well. Owing to the low coarsening rate and the high thermal stability of the precipitated phase, Al-Ti-V-Zr systems show promise as bases for high-temperature high-strength Al alloys. |
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Times Cited: 10
Article
English
Cited References Count: 44
Lf639 |
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refbase @ user |
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1328 |
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Han, S. Z.; Chung, S. C.; Lee, H. M. |
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Alloy Design and Coarsening Phenomenon of L1$_2$ Precipitates in High-Temperature Al-2at.%(Ti,V,Zr) Systems |
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Journal Article |
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1995 |
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Metallurgical and Materials Transactions A |
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20 |
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7 |
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1633-1639 |
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v-zr alloys
ti
behavior
elements
phase
do22
l12 |
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Aging works of two melt-spun Al-2 at pet (Ti,V,Zr) alloys showed that metastable Ll(2)Al(3)(Ti,V,Zr) precipitates were dominant and did not transform to stable DO23 ones: the average radius was 3 to 4 nm and the interparticle spacing was 10 to 30 nm at 698 K up to 400 hours. Coarsening kinetics was found to be very sluggish and was coincident with the low lattice mismatch. Due to the low coarsening rate and the high thermal. stability of the precipitated phase, rapidly solidified Al-Ti-V-Zr systems show promise as base of high-strength Al alloys for high-temperature applications. |
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Times Cited: 7
Article
English
Cited References Count: 26
Rj768 |
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refbase @ user |
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1169 |
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Kim, B. J.; Moon, K. I.; Lee, K. S. |
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The Effect of the Third-Element Addition on the Fatigue Properties of Mechanically Alloyed Al-Ti Alloys |
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Journal Article |
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1999 |
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Journal of Alloys and Compounds |
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292 |
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1-2 |
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174-180 |
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al-ti alloys
al-ti-x (x=b, v, zr, ce) alloys
fatigue properties
mechanical alloying
lattice-parameters |
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AI-Ti-X (X=B, V, Zr, Ce) alloys were prepared by mechanical alloying and their fatigue properties were examined at room temperature, 300 degrees C and 400 degrees C. MA Al-Ti alloys showed fatigue strengths competitive with those of conventional precipitation hardened Al alloys (Al 7075, Al 2024) and the addition of third elements further improved the fatigue strength of MA alloys. As the temperature was increased to 300 degrees C and 400 degrees C, a decrease in fatigue strength was observed but the general trend in fatigue properties was the same as that at room temperature. The fatigue strength of AI-TI-X alloys, except for the Ce-added alloy, was enhanced compared with AI-Ti alloy because the third element addition reduced the lattice mismatch between Al and AI,Ti effectively and thus maintained the fine particle size of dispersoids. AI-Ti-X alloy showed the smallest precipitate size and the best room and high temperature fatigue strengths. The fatigue ratio of MA Al-Ti alloys was about 0.4 and improved slightly with temperature. The fracture mode of MA Al-Ti alloys was thought to be intergranular failures, in some cases involving also the interface between the matrix and the dispersoids. (C) 1999 Elsevier Science S.A. All rights reserved. |
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Moon, K. I.
Hanyang Univ, Dept Met Engn, Seoul 133791, South Korea
Hanyang Univ, Dept Met Engn, Seoul 133791, South Korea |
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Times Cited: 3
Article
English
Cited References Count: 17
253md |
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refbase @ user |
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1279 |
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Witkin, D.; Lee, Z.; Rodriguez, R.; Nutt, S.; Lavernia, E. |
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Al-Mg alloy engineered with bimodal grain size for high strength and increased ductility |
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Journal Article |
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2003 |
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Scripta Materialia |
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49 |
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4 |
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297-302 |
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Aluminum alloys; Nanocrystalline materials; Mechanical properties |
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Al-7.5Mg powders were cryomilled, then consolidated and extruded to produce bulk nanostructured material. The extrusions had a tensile yield strength of 641 MPa and an ultimate strength of 847 MPa. Additional samples were prepared by combining cryomilled powder unmilled Al-7.5Mg, resulting in extrusions with high strength and increased ductility. |
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NU @ karnesky @ |
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10322 |
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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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Lee, Woei-Shyan; Chen, Tao-Hsing; Lin, Chi-Feng; Lu, Ging-Ting |
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Adiabatic Shearing Localisation in High Strain Rate Deformation of Al-Sc Alloy |
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Journal Article |
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2010 |
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Materials Transactions |
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51 |
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7 |
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1216-1221 |
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aluminium-scandium alloy, strain rate sensitivity, adiabatic shearing, precipitates |
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Aluminium-scandium (Al-Sc) alloy is subjected to shear deformation at high strain rates ranging from 3.0×105 s−1 to 6.2×105 s−1 using a compressive-type split-Hopkinson pressure bar (SHPB). The effects of the strain rate on the shear stress, adiabatic shear band characteristics, and fracture features of the Al-Sc alloy are systematically examined. The results show that both the shear stress and the strain rate sensitivity increase with an increasing strain rate. In addition, it is shown that an adiabatic shear band is formed within the deformed specimens for all values of the strain rate. As the strain rate is increased, the width of the shear band decreases, but the microhardness increases. Moreover, the distortion angle and the magnitude of the local shear strain near the shear band both increase with an increasing strain rate. At a strain rate of 3.0×105 s−1, the fracture surface is characterised by multiple transgranular clearage fractures. However, for strain rates greater than 4.4×105 s−1, the fracture surface has a transgranular dimple-like characteristic, and thus it is inferred that the ductility of the Al-Sc alloy improves with an increasing strain rate. |
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NU @ karnesky @ |
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10917 |
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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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Galtrey, M.J.; Oliver, R.A.; Kappers, M.J.; McAleese, C.; Zhu, D.; Humphreys, C.J.; Clifton, P.H.; Larson, D.; Cerezo, A. |
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Compositional inhomogeneity of a high-efficiency In[sub x]Ga[sub 1 - x]N based multiple quantum well ultraviolet emitter studied by three dimensional atom probe |
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Journal Article |
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2008 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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92 |
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4 |
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041904-3 |
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III-V semiconductors; indium compounds; light emitting diodes; semiconductor quantum wells; wide band gap semiconductors |
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An InxGa1−xN based multiple quantum well structure emitting in the ultraviolet, which has the highest reported efficiency (67%) at its wavelength (380 nm), was analyzed with the three-dimensional atom probe. The results reveal gross discontinuities and compositional variations within the quantum well layers on a 20–100 nm length scale. In addition, the analysis shows the presence of indium in the AlyGa1−yN barrier layers, albeit at a very low level. By comparing with analogous epilayer samples, we suggest that the quantum well discontinuities we observe may play an important role in improving the efficiency of these structures. |
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NU @ karnesky @ |
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10199 |
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Kim, Y.-C.; Adusumilli, P.; Lauhon, L.J.; Seidman, D.N.; Jung, S.-Y.; Lee, H.-D.; Alvis, R.L.; Ulfig, R.M.; Olson, J.D. |
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Three-dimensional atomic-scale mapping of Pd in Ni[sub:1 - x]Pd[sub:x]Si/Si(100) thin films |
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Journal Article |
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2007 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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91 |
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11 |
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113106:1-3 |
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annealing; interface roughness; nickel compounds; palladium compounds; rapid thermal processing; semiconductor-metal boundaries |
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Atom-probe tomography was utilized to map the three-dimensional distribution of Pd atoms in nickel monosilicide thin films on Si(100). A solid-solution Ni0.95Pd0.05 film on a Si(100) substrate was subjected to rapid thermal processing plus steady-state annealing to simulate the thermal processing experienced by NiSi source and drain contacts in standard complementary metal-oxide-semiconductor processes. Pd is found to segregate at the (Ni0.95Pd0.05)Si/Si(100) heterophase interface, which may provide a previously unrecognized contribution to monosilicide stabilization. The silicide-Si heterophase interface was reconstructed in three dimensions on an atomic scale and its chemical roughness was evaluated. |
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no |
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NU @ karnesky @ |
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9944 |
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