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Sharma, S. P.; Fonash, S. J.; Schrenk, G. L. |
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Publication |
The electron transfer process in field ionisation |
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Journal Article |
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1970 |
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Abstract |
Surface Science |
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Corporate Author |
Surf. Sci. |
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23 |
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field ionisation theory and processes; Field Ionization; APFIM-shortbib-SS23 |
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6275 |
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Son, U. T.; Hren, J. J. |
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Measurement of atomic order with the FIM |
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Journal Article |
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1970 |
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Surface Science |
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Surf. Sci. |
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23 |
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alloys - short and long range order; Field Ion Microscopy; APFIM-shortbib-SS23 |
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6281 |
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Goodman, S. R.; Brenner, S. S.; Low, J. R. |
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An FIM-atom probe study of the precipitation of copper from iron-1 4 at pct copper I Field-ion microscopy |
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Journal Article |
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1973 |
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Metallurgical Transactions |
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4 |
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10 |
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2363-2369 |
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metallurgical applications; Atom Probe Field Ion Microscopy |
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6592 |
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Goodman, S. R.; Brenner, S. S.; Low, J. R. |
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An FIM-atom probe study of the precipitation of copper from iron-1 4 at pct copper II Atom probe analyses |
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Journal Article |
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1973 |
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Metallurgical Transactions |
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4 |
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10 |
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2371-2378 |
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metallurgical applications; atom probe field ion microscopy |
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6593 |
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Audiffren, M.; Traimond, P.; Bardon, J.; Drechsler, M. |
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Study of two-dimensional aggregates of W by field-ion microscopy (French) |
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Book Chapter |
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1977 |
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3rd Coll. Intl. Phys. Chim. Surf Solides, Grenoble |
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401 |
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surface structure; Field Ion Microscopy |
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7152 |
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Current, M. I.; Wei, C. Y.; Seidman, D. N. |
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Direct observation of the primary state of damage of ion-irradiated tungsten: II. Definitions and results |
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Journal Article |
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1983 |
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Philosophical Magazine A |
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Phil. Mag. A |
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47 |
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407-434 |
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8353 |
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Cerezo, A.; Abraham, M.; Clifton, P.; Lane, H.; Larson, D. J.; Petford-Long, A. K.; Thuvander, M.; Warren, P. J.; Smith, W., G D |
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Three-dimensional atomic scale analysis of nanostructured materials |
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Journal Article |
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2001 |
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Micron |
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32 |
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731-739 |
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Atom probe; Nanostructures; Nanocrystalline material; FINEMET; Multilayers |
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The 3-dimensional atom probe (3DAP) has been used to provide atomic-scale microcharacterisation of a number of nanostructured
materials. Grain boundary segregation has been investigated in electrodeposited nanocrystalline nickel and Ni-P. In the nanocrystalline
nickel, there was no observable grain boundary segregation in the as-deposited condition. After annealing, carbon and sulphur contamination
was found at the boundary of an abnormally-grown grain. In the as-deposited Ni-P alloy, only limited grain boundary segregation of P is seen,
but annealing produces significant segregation and the formation of Ni3P precipitates at grain boundaries. The phase chemistry in a melt-spun
amorphous Fe-Si-Cu-Nb-B-Al (FINEMET-type) alloy has also been studied, and the hetereogeneous nucleation of Fe-Si nanocrystals at Cu
precipitates shown conclusively. It is found that at early stages of crystallisation, there is only limited partitioning of the Si between the
nanocrystals and the amorphous matrix. Atom probe studies of thin layered films have historically been limited by specimen preparation
problems, but recent advances have now yielded data on metallic multilayer films. This has allowed atomic-scale measurements of interface
chemistry in these films for the first time. q 2001 Elsevier Science Ltd. All rights reserved. |
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9025 |
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Ivanisenko, Y.; MacLaren, I.; Sauvage, X.; Valiev, R.Z.; Fecht, H.J. |
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Phase transformations in pearlitic steels induced by severe plastic deformation |
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Journal Article |
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2006 |
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High Pressure Technology Of Nanomaterials |
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114 |
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133-144 |
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Behavior; Carbon-Steels; Cementite Dissolution; Decomposition; driven phase transformations; field ion microscopy and 3D atom probe; Fracture; high pressure torsion; high resolution TEM; Iron; Materials Science, Multidisciplinary; nanocrystalline; Nanostructure; pearlitic steels; Physics, Applied; Physics, Condensed Matter; Temperatures |
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The paper presents an overview of a number of unusual phase transformations which take place in pearlitic steels in conditions of the severe deformation, i.e. combination of high pressure and strong shear strain. Strain-induced cementite dissolution is a well-documented phenomenon, which occurs during cold plastic deformation of pearlitic steels. Recently new results which can shed additional light on the mechanisms of this process were obtained thanks to 3DAP and HRTEM investigations of pearlitic steel deformed by high pressure torsion (HPT). It was shown that the process of cementite decomposition starts by carbon depletion from the carbides, which indicates that the deviation of cementite's chemical composition from the stoichiometric is the main reason for thermodynamic destabilisation of cementite during plastic deformation. Important results were obtained regarding the distribution of released carbon atoms in ferrite. It was experimentally confirmed that carbon segregates to the dislocations and grain boundaries of nanocrystalline ferrite. Another unusual phase transformation taking place in nanocrystalline pearlitic steel during room temperature HPT is a stress induced alpha ->gamma transformation, which never occurs during conventional deformation of coarse grained iron and carbon steels. It was concluded that this occurred due to a reverse martensitic transformation. The atomistic mechanism and the thermodynamics of the transformation, as well as issues related to the stability of the reverted austenite will be discussed. |
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1012-0394 |
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NU @ karnesky @ 9550 |
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9699 |
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Grennan-Heaven, N.; Cerezo, A.; Godfrey, T.J.; Smith, G.D.W. |
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Optimisation of a scanning atom probe with improved mass resolution using post deceleration |
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Journal Article |
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2007 |
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Ultramicroscopy |
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107 |
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9 |
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705-712 |
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3D atom-probe; time-of-flight mass spectrometry; mass resolution |
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In this paper, we present calculations and experimental results obtained using post deceleration of ions in a scanning atom probe (SAP) geometry to improve the mass resolution. Various electrode geometries, tip to electrode distances in the range 50-170 mu m and three different pulse shapes have been evaluated. Experimental mass resolutions of 750 FWHM and 200 FWTM have been achieved reproducibly for the W-184(3+) peak without the use of a reflectron lens. 3D finite element electrostatics software has been used to simulate the ion trajectories through the instrument and thus to calculate the variations in velocities for the different electrode configurations. The observed trends are found to agree well with experimental results. |
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0304-3991 |
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ISI:000247770100003 |
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no |
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NU @ m-krug @ |
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9887 |
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Heck, P. R.; Pellin, M. J.; Davis, A. M.; Martin, I.; Renaud, I.; Benbalagh, R.; Isheim, D.; Seidman, D. N.; Hiller, J.; Stephan, T.; Lewis, R. S.; Savina, M. R.; Maine, A.; Elam, J.; Staermann, F. J.; Zhao, X.; Daulton, T. L.; Amari, S. |
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Atom-Probe Tomographic Analyses of Presolar Silicon Carbide Grains and Meteoric Nanodiamonds – First Results on Silicon Carbide |
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2010 |
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40th Lunar and Planetary Science Conference |
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NU @ karnesky @ |
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10734 |
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