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Münger, E. P.; Chirita, V.; Greene, J. E.; Sundgren, J. – E. |
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Adatom-induced diffusion of two-dimensional close-packed Pt7 clusters on Pt(111) |
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Journal Article |
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1996 |
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Surface Science |
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Surf. Sci. |
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355 |
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L325-L330 |
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2302 |
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Florencio, J.; Ren, D. M.; Tsong, T. T. |
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Absolute composition depth-profiles in surface segregation of Pt-Rh alloys |
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Journal Article |
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1996 |
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Surface Science |
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Surf. Sci. |
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345 |
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L29-L33 |
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2310 |
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Menand, A.; Zapolsky-Tatarenko, H.; Nerac-Partaix, A. |
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Atom-probe investigations of TiAl alloys |
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Journal Article |
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1998 |
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Materials Science and Engineering A |
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Mater. Sci. Eng. A |
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A250 |
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55-64 |
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3D Atom Probe, Intermetallics |
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Atom probe field ion microscopy (APFIM) and tomographic atom probe (TAP) have been used to study TiAi-based alloys. The element concentrations, the influence of additional elements such as Cr or Nb as well as the solubility of oxygen in alpha(2) (Ti3Al) and gamma (TiAl) phases in compounds with nominal concentration Ti54Al46 and Ti58Al42 have been determined. By using the detection of oxygen atoms as a very local probe, the present investigation revealed the existence of some intermediate phases during the phase transformation alpha --> gamma. The presence of the oxygen atoms during this transformation gives some peculiarities on the transformation path. The appearance of some metastable phases may be explained by the existence of the homologous series Ti2n-1Aln where n is an integer varying from 1 (stoichiometry TiAl) to infinity (phase alpha(2) Ti2Al). (C) 1998 Elsevier Science S.A. All rights reserved. |
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2315 |
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Cerezo, A.; Godfrey, T. J.; Sijbrandij, S. J.; Smith, W., G D; Warren, P. J. |
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Performance of an energy-compensated three-dimensional atom probe |
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Journal Article |
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1998 |
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Rev. Sci. Inst. |
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69 |
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49-58 |
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3D Atom Probe, Instrumentation |
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A wide acceptance angle first-order reflectron lens has been incorporated into a three-dimensional atom probe (3DAP) to provide improved mass resolution. This new 3DAP instrument is capable of resolving isotopes in the mass spectrum, with resolutions better than m/Delta m = 500 full width at half maximum and 250 full width at 10% maximum. However, use of a reflectron for energy compensation within an imaging system means that improvements in mass resolution result in degradation of the spatial resolution. This article addresses the detailed design of the energy compensated 3DAP, and the minimization and compensation of chromatic aberrations in the imaging performance of the instrument. Some applications of the new instrument are included to illustrate its capabilities in the atomic-scale analysis of engineering alloys. (C) 1998 American Institute of Physics. |
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2348 |
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Deconihout, B.; Renaud, L.; DaCosta, G.; Bouet, M.; Bostel, A.; Blavette, D. |
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Implementation of an optical TAP: preliminary results |
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Journal Article |
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1998 |
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Ultramicroscopy |
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73 |
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253-260 |
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3D Atom Probe, Instrumentation |
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The FIM Group of the University of Rouen is developing a new type of detector that can be used in atom probe and 3D atom probe applications. This detector consists of an array of conductive and transparent strips covered with a phosphorescent material. After having produced light, electrons generated by ionic impacts onto microchannel plates produce signals on strips that are used for timing. At the same time, light produced by ions on the phosphor screen is recorded by means of a CCD image sensor. Then, the comparison between positions and the distribution of time of flight on the strip array makes it possible to correlate positions and times for each event. In this contribution, preliminary results obtained with a 5 x 5 cm(2) detector having eight strips will be shown. Potential capabilities and performance will be discussed. (C) 1998 Elsevier Science B.V. All rights reserved. |
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2351 |
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Humphreys, E. S.; Warren, P. J.; Cerezo, A. |
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Characterisation of a rapidly solidified Al-V-Fe alloy |
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Journal Article |
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1998 |
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Materials Science and Engineering A |
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Mater. Sci. Eng. A |
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A250 |
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158-163 |
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3D Atom Probe, Aluminum alloys |
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This paper outlines preliminary results from a combined XRD: TEM and APFIM investigation of a rapidly solidified Al94V4Fe2 alloy that had been produced by melt spinning. The microstructure produced consists of a high volume fraction (approximate to 50%) of 20 nm icosahedral particles in an f.c.c. matrix. Three-dimensional atom probe analysis shows that this second phase is enriched in iron and vanadium compared with the matrix. The thermal stability of the melt-spun ribbon has been investigated using DSC. It was found to be stable up to a temperature of 520 degrees C, after which there were two solid state transformations. (C) 1998 Elsevier Science S.A. All rights |
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2355 |
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Murakami, H.; Warren, P. J.; Kumeta, T.; Koizumi, Y.; Harada, H. |
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Microstructural evolution of b2 (NiTi-based) / b'(Ni2TiAl-based) two phase quaternary alloys |
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Journal Article |
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1997 |
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J. Surf. Analysis |
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3 |
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516-520 |
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3D Atom Probe, Intermetallics |
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2358 |
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Murakami, H.; Warren, P. J.; Harada, H. |
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Atom probe microanalyses of some Ni-base single crystal superalloys |
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Journal Article |
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1995 |
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Proc. 3rd Intl. Charles Parsons Turbine Conf., April 25-27, 1995, Newcastle-upon-Tyne,UK, R. D. Conroy, M. J. Goulette and A. Strang, eds., Institute of Materials, London, UK, |
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1 |
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343 |
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3D Atom Probe, Superalloys |
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2359 |
| Permanent link to this record |
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Warren, P. J.; Cerezo, A.; Smith, W., G D |
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Observation of atomic planes in 3DAP analysis |
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Journal Article |
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1998 |
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Ultramicroscopy |
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73 |
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261-266 |
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3D Atom Probe, Instrumentation |
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Three-dimensional atom probe (3DAP) reconstruction of a tungsten specimen containing grain boundaries has revealed a wide range of atomic planes. It has been found that planes are visible even for crystallographic poles up to 45 degrees away from the surface normal. These results suggest that, at least for pure elements, it may be possible to reconstruct the atomic lattice originally present in the material using 3DAP techniques. (C) 1998 Published by Elsevier Science B.V. All rights reserved. |
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2365 |
| Permanent link to this record |
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Warren, P. J.; Grovenor, M., C R |
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Comparison to STEM and atom probe methods for chemical analysis of grain boundaries in commercial Al alloys |
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Journal Article |
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1995 |
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Materials Science Forum |
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Mater. Sci. Forum |
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189-190 |
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115-120 |
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3D Atom Probe, Aluminum alloys |
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The mechanical properties of grain boundaries in aluminium alloys appear to be very strongly affected by subtle changes in the local chemistry. Due to these microstructural features being on the nanometre scale they are at the limit of conventional TEM based analysis techniques. X-ray and atom probe microanalysis techniques have been applied to the study of grain boundary chemistry in a commercial aluminium alloy. A variety of heat treatments resulting in different stress corrosion cracking susceptibilities have been invesigated. This paper compares typical analyses from one heat treatment to show that the combination of these two techniques with their quite different intrinsic advantages and limitations allows clearer characterisation of the variations in grain boundary chemistry. |
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2367 |
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