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Wu, Ling-Mei; Seyring, Martin; Rettenmayr, Markus; Wang, Wen-Hsiung |
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Publication |
Characterization of precipitate evolution in an artificially aged Al-Zn-Mg-Sc-Zr alloy |
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Journal Article |
Pages |
2010 |
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Abstract |
Materials Science and Engineering: A |
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527 |
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Summary Language |
1068-1073 |
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Al-Zn-Mg-Sc-Zr alloy; age hardening; precipitation; transmission electron microscopy (TEM) |
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Abbreviated Series Title |
The precipitates of an age hardenable Al-Zn-Mg-Sc-Zr alloy aged at 140 °C have been studied by transmission electron microscopy (TEM). The results are interpreted in terms of structural transformations that involve two types of Guinier-Preston (GP) zones (I and II), the metastable η’ hardening precipitate and the stable phase η-phase (MgZn2). At early stages of ageing, the GPI zones act as nucleation sites for the plate-like η’ phase which precipitates on the 111Al plane. The transformation from η’ to η occurs gradually at longer ageing times. The η particles mainly consist of η1 and η2 phase, with small amounts of η4 type and minor quantities of η’ type structures. Furthermore, while a fine dispersion of coherent Al3(Sc,Zr) precipitates is known to have a beneficial effect on the strengthening of the alloy, the formation of GPII zones is suppressed in the presence of zirconium that leads to a reduction in the amount of η’ formed during subsequent ageing. |
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0921-5093 |
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NU @ karnesky @ Wu2009 |
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10688 |
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D J Larson and D Lawrence and W Lefebvre and D Olson and T J Prosa and D A Reinhard and R M Ulfig and P H Clifton and J H Bunton and D Lenz and J D Olson and L Renaud and I Martin and T F Kelly |
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Toward atom probe tomography of microelectronic devices |
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Journal Article |
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2011 |
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Journal of Physics: Conference Series |
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326 |
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1 |
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012030 |
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Atom probe tomography and scanning transmission electron microscopy has been used to analyze a commercial microelectronics device prepared by depackaging and focused ion beam milling. Chemical and morphological data are presented from the source, drain and channel regions, and part of the gate oxide region of an Intel ® i5-650 p-FET device demonstrating feasibility in using these techniques to investigate commercial chips. |
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1742-6596 |
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NU @ karnesky @ |
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11288 |
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Sarrau, J. M.; Martin, C.; Bostel, A.; Gallot, J. C. R. |
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Atom probes: relationship between results of analysis and structure of a sample |
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Journal Article |
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1980 |
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C. R. Hebd. Seances Acad. Sci. B |
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290 |
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63-66 |
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atom probe field ion microscopy |
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7886 |
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Sarrau, J. M.; Bostel, A.; Martin, C.; Gallot, J. C. R. |
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Atom probe: experimental results on tungsten and iron-aluminum alloy samples |
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Journal Article |
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1978 |
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C. R. Hebd. Seances Acad. Sci., Ser. B |
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286, |
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atom probe field ion microscopy |
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7498 |
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Sarrau, J. M.; Bostel, A.; Martin, C.; Gallot, J. C. R. |
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Atom probe: experimental results on tungsten and iron-aluminium alloy samples (French) |
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Journal Article |
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1978 |
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C. R. Hebd. Seances Acad. Sci. B |
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286 |
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metallurgical applications; atom probe field ion microscopy |
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7333 |
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Sarrau, J. M.; Bostel, A.; Martin, C.; Gallot, J. C. R. |
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Atom probe determination of time of flight in a hyperboloidal sample model (French) |
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Journal Article |
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1976 |
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C. R. Hebd. Seances Acad. Sci. B |
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283 |
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calibration and charge state studies; atom probe field ion microscopy |
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7108 |
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Sarrau, J. M.; Martin, C.; Bostel, A.; Gallot, J. C. R. |
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A spectral resolution method for an atom probe field ion microscope (French) |
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Journal Article |
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1976 |
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C. R. Hebd. Seances Acad. Sci. B |
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282 |
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associated instrumentation; atom probe field ion microscopy |
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7107 |
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Sarrau, J. M.; Martin, C.; Gallot, J. |
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An atom probe field ion microscope calibrated using tantalum a single isotope metal (French) |
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Journal Article |
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1975 |
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C. R. Hebd. Seances Acad. Sci. B |
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281 |
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calibration and charge state studies; atom probe field ion microscopy |
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6959 |
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Stone, D.S.; Gao, H.; Chantharangsi, C.; Paksunchai, C.; Bischof, M.; Jaeger, D.; Martini, A.; Scharf, T.W.; Aouadi, S.M. |
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Load-dependent high temperature tribological properties of silver tantalate coatings |
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Journal Article |
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2014 |
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Surface and Coatings Technology |
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244 |
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37-44 |
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Friction; Tribology; Silver tantalate; Molecular dynamics; Sputtering |
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Abstract Silver tantalate coatings were produced by reactive unbalanced magnetron sputtering from silver and tantalum sources as potential high temperature solid lubricants. The films were wear-tested at 750 °C under normal loads of 1, 2, 5, or 10 N against a Si3N4 counterface. These sliding tests revealed that the friction monotonically increased as the load was increased. A systematic investigation of the surface and sub-surface regions of the wear track, using techniques such as Scanning Auger Nanoprobe, Atom Probe Tomography, and cross-sectional transmission electron microscopy, revealed the following trends with increasing load: (1) a decrease in the amount of Ag on the surface of the wear track; (2) a decrease in the thickness of the mechanically mixed layer that forms as a result of the reconstruction of AgTaO3 to form Ta2O5 and Ag; and (3) the formation of a porous structure throughout the tribofilm as a result of the segregation and migration of Ag from the original AgTaO3 matrix. These results were complemented by molecular dynamics simulations, which confirmed the increase of friction with load. Further, the simulations support the hypothesis that this trend can be explained in terms of decreased presence of Ag clusters near the sliding surface and the associated decreased porosity. |
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0257-8972 |
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NU @ karnesky @ |
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11490 |
| Permanent link to this record |
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Martinez, E.; Fu, C.-C.; Levesque, M.; Nastar, M.; Soisson, F. |
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Simulations of decomposition kinetics of Fe-Cr solid solutions during thermal aging |
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Journal Article |
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2011 |
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Solid State Phenomena |
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172-174 |
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1016 |
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cond-mat.mtrl-sci; cond-mat.stat-mech; physics.comp-ph |
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The decomposition of Fe-Cr solid solutions during thermal aging is modeled by Atomistic Kinetic Monte Carlo (AKMC) simulations, using a rigid lattice approximation with composition dependant pair interactions that can reproduce the change of sign of the mixing energy with the alloy composition. The interactions are fitted on ab initio mixing energies and on the experimental phase diagram, as well as on the migration barriers in iron and chromium rich phases. Simulated kinetics is compared with 3D atom probe and neutron scattering experiments. |
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arXiv:1102.1091v1; 6 pages, 5 figures, PTM 2010 |
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NU @ karnesky @ |
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11018 |
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