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Type Audiffren, M.; Traimond, P.; Bardon, J.; Drechsler, M.
  Publication Study of two-dimensional aggregates of W by field-ion microscopy (French) Volume Book Chapter
Pages 1977
  Abstract 3rd Coll. Intl. Phys. Chim. Surf Solides, Grenoble  
  Corporate Author  
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  Summary Language 401 Series Editor surface structure; Field Ion Microscopy  
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no 7152
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Seidman, D. N.; Current, M. I.; Pramanik, D.; Wei, C. Y. Direct observations of the primary state of radiation damage of ion-irradiated tungsten and platinum Journal Article 1981 Nuclear Instruments and Methods 182-183 1 477-481 A brief summary of the major results of Cornell work on the primary state of radiation damage in ion-irradiated tungsten and plantinum is presented. The primary research tool for this research is the field-ion microscope (FIM). The FIM is ideally suited for this research because of its excellent atomic resolution and the ability to examine the interior of the specimens as a result of the field-evaporation effect. This paper summarizes, in outline form: (1) the main experimental programs; (2) the principal experimental quantities determined from the analyses performed on all the individual depleted zones (DZs) observed; (3) a number of the more important results and conclusions concerning the vacancy structure of DZs; and (4) the three-dimensional spatial distribution of self-interstitial atoms detected around DZs in tungsten which had been irradiated and examined in situ at <10 K. no 8079
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Seidman, David N.; Current, Michael I.; Pramanik, Dipankar; Wei, Ching-Yeu Atomic resolution observations of the point defect structure of depleted zones in ion-irradiated metals Journal Article 1982 Journal of Nuclear Materials J. Nucl. Mater. 108-109 67-68 The previous termpoint defectnext term structure of individual depleted zones (DZs) created by a variety of different projectile ions, with energies in the range 1590 keV, was studied employing the field-ion microscope technique [19]. The irradiations were performed in situ at a temperature of less than. 15 K in the case of tungsten and 40 K for platinum. The fluence was always less then 1013 ions cm&#8722;2, so that each depleted zone detected was created by a single energetic projectile ion. The following variables were studied: (1) the effect of varying the initial energy of the projectile ion at constant projectile mass; (2) the effect of varying the projectile mass at constant initial energy of the projectile ion; and (3) the non-linear effects produced by employing dimer ions (W+2 and Ag+2). The analyses of the depleted zones consisted of measuring and/or determining the following quantities: (1) the number of vacancies per DZ; (2) the spatial distribution of self-interstitial atoms around the DZs in the case of tungsten; (3) the dimensions of the DZs; (4) the vacancy concentration per DZ; (5) the radial distribution function of the vacancies within each DZ; (6) the radiation damage profiles due to the cumulative effects of many DZs; and (7) the non-linear effects produced by the dimer irradiations. The results are discussed and compared with different analytical theories and computer simulations of the primary state of radiation damage. no 8285
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Current, M. I.; Wei, C. Y.; Seidman, D. N. Direct observation of the primary state of damage of ion-irradiated tungsten: II. Definitions and results Journal Article 1983 Philosophical Magazine A Phil. Mag. A 47 407-434 no 8353
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Miller, M. K.; Beaven, P. A.; Brenner, S. S.; Smith, G. D. W. An atom probe study of the aging of iron-nickel-carbon martensite Journal Article 1983 Metall. Trans. A 14, 1021-1024 martensite Fe-Ni-C APFIM aging; atom probe field ion microscopy no 8413
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Soffa, W. A.; Brenner, S. S.; Miller, M. K. Atom probe studies of the decomposition spectrum in alloys Book Chapter 1984 Decomposition of Alloys: The Early Stages 227-232 FeCr spinodal decomposition APFIM; atom probe field ion microscopy Pergamon Oxford Haasen, P.; Gerold, V.; Wagner, R.; Ashby, M. F. Acta-Scripta Metallurgica Proceedings 2 0080316514 no 8662
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Audiffren, M.; Traimon, P.; Bardon, J.; Drechsler, M. A study of atom zigzag chains on the surface of tungsten Journal Article 1978 Surface Science Surf. Sci. 75 4 751-760 surface structure; Field Ion Microscopy Nishigaki and Nakamura have observed zigzag chains on the central (011) face of tungsten after field evaporation at T #62; 140 K. In this paper, a study of the formation, disappearance and structure of such chains is described. Tungsten tips of small radii down to 60 Ã were used. Chains of 3 to 9 spots, that are clearly visible, are found even at 90 K. Four different structure models of the zigzag chains are discussed, including the multibranch model proposed by the Japanese authors. The interpretation of our experimental results shows fairly clearly that the real zigzag chain structure is a special non-dense structure. It must be formed by a local displacement of the tungsten adatoms in the field. Without the field, a zigzag chain is transformed into a two-dimensional cluster of the nearest neighbour atom by a small increase in temperature. If the field is reintroduced, the cluster can revert to the initial zigzag structure. The zigzag structure is interpreted as being caused by forces of repulsion between the atom dipoles. no 8848
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Current, Michael I.; Seidman, David N. Sputtering of tungsten: a direct view of a near surface depleted zone created by a single 30 keV63 Cu+ projectile Journal Article 1980 Nuclear Instruments and Methods 170 1-3 377-381 The vacancy structure of near-surface depleted zone (DZ), created by a single 30 keV 63Cu+ ion in a tungsten field-ion microscope (FIM) specimen, was determined with atomic resolution. Both the irradiation and pulse field-evaporation experiments were performed in situ at less, approximate11 K, so that the observed vacancy structure was unaltered by the long-range migration of self-interstitial atoms. The following basic physical quantities were measured: (1) the number of vacancies; (2) the dimensions; (3) the vacancy concentration; (4) the distribution of first-nearest-neighbor vacancy clusters; and (5) the radial-distribution function for the vacancies out to ninth-nearest neighbor. The values of these quantitieswere shown to be similar for both the near-surface DZ and DZs created in the bulk of the same specimen by 30 keV 63Cu+ projectiles. no 8862
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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 Three-dimensional atomic scale analysis of nanostructured materials Journal Article 2001 Micron 32 731-739 Atom probe; Nanostructures; Nanocrystalline material; FINEMET; Multilayers 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. no 9025
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Atrens, A.; Wang, J. Q.; Stiller, K.; Andren, H. O. Atom probe field ion microscope measurements of carbon segregation at an alpha :alpha grain boundary and service failures by intergranular stress corrosion cracking Journal Article 2006 Corrosion Science 48 1 79-92 Grain boundary analysis; Pipeline steel; Carbon segregation; Stress corrosion cracking This work reports on a critical measurement to understand the intergranular stress corrosion cracking (IGSCC) of pipeline steels: the atom probe field ion microscope (APFIM) measurement of the carbon concentration at a grain boundary (GB). The APFIM measurement was related to the microstructure and to IGSCC observations. The APFIM indicated that the GB carbon concentration of X70 was not, vert, similar10 at% or less, which correlated with a high resistance to IGSCC for X70. no 9396
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