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AbstractAbstract
[en] A very simple atomistic model for predicting the heats of formation of alloys involving transition elements is presented. Because of the paucity of experimental thermodynamic data, the sign of the heat of formation was determined from the known behaviour of the binary phase diagrams. By assigning only two co-ordinates to each transition element, it was found that all those binary alloys with positive heats of formation could be separated from those with negative values. By fixing the magnitude of the heat of formation to known experimental values, it was possible to predict values for all those binary systems which had not yet been measured. This work is invaluable because it not only tabulates the predicted heats of formation of binary compounds involving transition elements, but it also updates Hultgren's 1973 compilation of the experimental thermodynamic data. Moreover, the collation of all binary T-X phase diagrams containing a given transition element T with respect to X's period and group will be very useful for providing a global view of trends across the periodic table. refs.; figs.; tabs
Primary Subject
Source
Cohesion and Structure; v. 1; 1988; 774 p; North-Holland; Amsterdam (Netherlands); ISBN 0-444-87098-9; 

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Book
Literature Type
Numerical Data
Country of publication
BINARY ALLOY SYSTEMS, CHROMIUM BASE ALLOYS, COBALT BASE ALLOYS, EXPERIMENTAL DATA, FORMATION HEAT, HAFNIUM BASE ALLOYS, INTERMETALLIC COMPOUNDS, IRIDIUM BASE ALLOYS, IRON BASE ALLOYS, LANTHANUM BASE ALLOYS, MANGANESE BASE ALLOYS, MATHEMATICAL MODELS, MOLYBDENUM BASE ALLOYS, NICKEL BASE ALLOYS, NIOBIUM BASE ALLOYS, OSMIUM BASE ALLOYS, PALLADIUM BASE ALLOYS, PHASE DIAGRAMS, PLATINUM BASE ALLOYS, RHENIUM BASE ALLOYS, RHODIUM BASE ALLOYS, RUTHENIUM BASE ALLOYS, SCANDIUM BASE ALLOYS, TANTALUM BASE ALLOYS, TECHNETIUM BASE ALLOYS, THEORETICAL DATA, TITANIUM BASE ALLOYS, TRANSITION ELEMENTS, TUNGSTEN BASE ALLOYS, VANADIUM BASE ALLOYS, YTTRIUM BASE ALLOYS, ZIRCONIUM BASE ALLOYS
ALLOY SYSTEMS, ALLOYS, CHROMIUM ALLOYS, COBALT ALLOYS, DATA, DIAGRAMS, ELEMENTS, ENTHALPY, HAFNIUM ALLOYS, INFORMATION, IRIDIUM ALLOYS, IRON ALLOYS, LANTHANUM ALLOYS, MANGANESE ALLOYS, METALS, MOLYBDENUM ALLOYS, NICKEL ALLOYS, NIOBIUM ALLOYS, NUMERICAL DATA, OSMIUM ALLOYS, PALLADIUM ALLOYS, PHYSICAL PROPERTIES, PLATINUM ALLOYS, PLATINUM METAL ALLOYS, RARE EARTH ALLOYS, REACTION HEAT, RHENIUM ALLOYS, RHODIUM ALLOYS, RUTHENIUM ALLOYS, SCANDIUM ALLOYS, TANTALUM ALLOYS, TECHNETIUM ALLOYS, THERMODYNAMIC PROPERTIES, TITANIUM ALLOYS, TUNGSTEN ALLOYS, VANADIUM ALLOYS, YTTRIUM ALLOYS, ZIRCONIUM ALLOYS
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AbstractAbstract
[en] The anomalous contraction that cerium undergoes when it is the A component in AB2 Laves phase compounds is used to estimate its metallic radius when it is joined to a given B component. In each case, isostructural compounds of trivalent (rare earths) and tetravalent (zizconium, hafnium and thorium) A elements with the same B element are taken as the reference system. The trivalent metallic radius (r3 = 1.846 A) of cerium proposed by Gschneidner and Smoluchowski was confirmed, but a tetravalent metallic radius (r4 = 1.688 A) of cerium which exceeds their value by 1% was obtained. The presence of A-B contacts is related to the intermediate valency behaviour, and the valency calculated for each compound is compared with other physical properties. A distinction between localized conduction band hybridization and interconfigurational fluctuation is proposed. (Auth.)
Primary Subject
Record Type
Journal Article
Literature Type
Numerical Data
Journal
Journal of the Less-Common Metals; ISSN 0022-5088;
; v. 84(1); p. 1-10

Country of publication
ALUMINIUM BASE ALLOYS, CERIUM, CERIUM ALLOYS, COBALT BASE ALLOYS, COMPARATIVE EVALUATIONS, INTERATOMIC DISTANCES, INTERMETALLIC COMPOUNDS, IRIDIUM BASE ALLOYS, IRON BASE ALLOYS, LAVES PHASES, MAGNESIUM BASE ALLOYS, NICKEL BASE ALLOYS, OSMIUM BASE ALLOYS, PLATINUM BASE ALLOYS, RHODIUM BASE ALLOYS, RUTHENIUM BASE ALLOYS, THEORETICAL DATA, VALENCE
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AbstractAbstract
[en] Structural materials used as cans and matrices of dispersion fuel elements are under consideration. Technological, mechanical, nuclear and corrosion properties of aluminium, tantalum, molybdenum, tungsten and alloys on the base of these metals are described in detail. Data on the behaviour of these materials under neutron irradiation are presented. A possibility of utilization of different grade graphite and glass carbon as fuel element structural materials is discussed
Original Title
Konstruktsionnye materialy
Primary Subject
Secondary Subject
Source
p. 12-102; 1982; p. 12-102; Ehnergoizdat; Moscow; 234 refs.; 81 figs.; 51 tabs.
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Book
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Yan, Erhu; Huang, Haoran; Min, Ruonan; Xu, Fen; Zhao, Ping; Zou, Yongjin; Chu, Hailiang; Zhang, Huanzhi; Sun, Lixian, E-mail: yeh@guet.edu.cn, E-mail: sunlx@guet.edu.cn2018
AbstractAbstract
[en] Highlights: • A new family of metallic hydrogen permeation membranes was developed. • A new compositional window for hydrogen permeable Nb-ZrCo alloys is established. • DS Nb25Zr35Co40 exhibits a substantial enhancement of hydrogen permeability. • Nb25Zr35Co40 is promising to make high-performance membranes for H2 separation.
Primary Subject
Source
S0254058418302220; Available from http://dx.doi.org/10.1016/j.matchemphys.2018.03.059; Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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AbstractAbstract
[en] High-temperature shape memory effect (HTSME) takes place in different alloys and compounds, such as: TiNi with Pt, Pd, Zr and Hf additions, Zr-based quasibinary intermetallics, NiAl-based, Cu-Al-Mn, Cu-Al-Zn and Fe-Ni-Co-Ti. It can be presumably adopted that all materials exhibit SME higher than 200 C should be considered as high-temperature SMA. The origin of the HTSME can be associated with: reverse martensitic transformation; precipitation-dissolution processes during dynamic aging. (orig.)
Primary Subject
Source
International symposium and exhibition on shape memory materials (SMM '99); Kanazawa (Japan); 19-21 May 1999; 19 refs.
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Journal Article
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Conference
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AbstractAbstract
[en] The study of complex materials (nonhomogeneous matrices containing medium and/or heavy atoms as major elements) by PIXE requires the tailoring of the experimental set up to take into account the high X-ray intensity produced by these main elements present at the surface, as well as the expected low intensity from other elements 'buried' in the substrate. The determination of traces is therefore limited and the minimum detection limit is generally lower by at least two orders of magnitude in comparison with those achievable for low Z matrices (Z≤20). Additionally, those high Z matrices having a high absorption capability, are not always homogeneous. The nonhomogeneity may be, on the one hand, a layered structure (which is uneasy to profile by RBS if the material contains elements of neighbouring masses or if the layered structure extends on several microns) or, on the other hand, inclusions which are to be localized. PIXE measurements at various incident energies (and with various projectiles (p, d, He3, He4)) are then an alternative method to overcome those difficulties. The use of special filters to selectively decrease the intensity of the most intense X-ray lines, the accurate calculation of the characteristic X-ray intensity ratios (Kα/Kβ, Lα/Lβ) of individual elements, the computation of the secondary X-ray fluorescence induced in thick targets are amongst the most important parameters to be investigated in order to solve these difficult analytical problems. Examples of Cr, Fe, Ni, Cu, Ag and Au based alloys with various coatings as encountered in industrial and archaeological metallurgy are discussed. RBS, PIGE and NRA are sometimes simultaneously necessary as complementary (or basic) approaches to identify corroded surface layers
Primary Subject
Source
S0168583X98009021; Copyright (c) 1999 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: China
Record Type
Journal Article
Journal
Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms; ISSN 0168-583X;
; CODEN NIMBEU; v. 150(1-4); p. 520-531

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AbstractAbstract
[en] Major views and theories are briefly listed of the mechanism of adhesive wear, including the recrystallization theory and the theory of protective oxide layer formation. The results are reported of seizure resistance tests at a temperature of 20 and 350 degC, respectively, at different specific pressures (14.7, 24.5, 40 and 54.5 MPa). Samples were tested of a different hardness. The analysis of the test results showed that for alloys of the 1Cr18Ni8Si5Mo5Mn5Nb type used primarily for valves employed in nuclear power plants, the hardness alone of the alloy significantly increased the resistance to seizure. (Z.S.). 2 tabs., 21 refs
Original Title
Problematika adhezivniho opotrebeni funkcnich ploch armatur
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Source
English translation available from Nuclear Information Center, 156 16 Prague 5-Zbraslav, Czechoslovakia at US$ 10 per page.
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Journal Article
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AbstractAbstract
[en] The crystal structure of Pr8Ga3Co compounds is studied by the method of monocrystal (autodiffractometer, MoKsub(α)): space group P63mc, a=10.489, c=6.910 A, Z=2. Coordination numbers of atoms are 11-14 for Pr, 11 for Ga, 7 for Co. The shortest interatomic distances are 3.365 for Pr-Pr, 3.047 for Pr-Ga, 2.75 A for Pr-Co. Pr3Ga3Co structure is akin to structures of R2In compounds (Ni2In type) and R2Ga (Cl2Pb type). Isostructural compounds form in systems of other rare earth metals with gallium and cobalt
Original Title
Kristallicheskaya struktura soedinenij R8Ga3Co (R=Ce, Pr, Nd, Sm, Tb, Dy, Ho, Er, Tm)
Primary Subject
Source
For English translation see the journal Soviet Physics - Crystallography (USA).
Record Type
Journal Article
Journal
Kristallografiya; ISSN 0023-4761;
; v. 29(4); p. 708-711

Country of publication
CERIUM BASE ALLOYS, COBALT ALLOYS, COORDINATION NUMBER, DYSPROSIUM BASE ALLOYS, ERBIUM BASE ALLOYS, GALLIUM ALLOYS, HEXAGONAL LATTICES, HOLMIUM BASE ALLOYS, INTERATOMIC DISTANCES, INTERMETALLIC COMPOUNDS, LATTICE PARAMETERS, MONOCRYSTALS, NEODYMIUM BASE ALLOYS, PRASEODYMIUM BASE ALLOYS, SAMARIUM BASE ALLOYS, TERBIUM BASE ALLOYS, TERNARY ALLOY SYSTEMS, THULIUM BASE ALLOYS
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Dhawan, A.; Bhatt, Y.C.; Sharma, S.K.; Roychowdhury, S.; De, P.K.
Proceedings of the symposium Zirconium - 20022002
Proceedings of the symposium Zirconium - 20022002
AbstractAbstract
[en] Potentiodynamic polarization studies were carried out on virgin specimens of Zr-based amorphous alloys Zr65Cu17.5Ni10Al7.5 (Inoue alloy), Zr46.75 Ti8.25Cu7.5 Ni10Be27.5 (Vitreloy-4 or V4) and Zr65Ni35 in 0.5 M H2SO4, 0.5 M HNO3 and 0.5 M NaOH at room temperature. The corrosion rates of Zr65Ni35 were found to be the lowest, while the alloy V4 had the maximum corrosion rates in all the three media indicating that V4 is more prone to corrosion in these aqueous media. The observed differences in corrosion behaviour are attributed to different alloy constituents and compositions of the alloys investigated. (author)
Primary Subject
Source
De, P.K. (ed.) (Materials Science Div., Bhabha Atomic Research Centre, Mumbai (India)); Board of Research in Nuclear Sciences, Dept. of Atomic Energy, Mumbai (India); 690 p; 2002; p. 459-463; ZIRC - 2002: national symposium Zirconium - 2002; Mumbai (India); 11-13 Sep 2002; 12 refs., 3 figs., 2 tabs.
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Book
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Conference
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Related RecordRelated Record
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Kamenetskaya, D.S.; Chagar, T.P.; Shterenberg, L.E.
Theoretical fundamentals of chemical technology. Chemical problems in metallurgy. Chemistry and technology of silicates. V. 31981
Theoretical fundamentals of chemical technology. Chemical problems in metallurgy. Chemistry and technology of silicates. V. 31981
AbstractAbstract
No abstract available
Original Title
Zakonomernosti izmeneniya diagramm sostoyaniya sistem metall- uglerod pri vysokikh davleniyakh v zavisimosti ot atomnogo nomera metalla
Primary Subject
Source
AN SSSR, Moscow; p. 107-106; 1981; p. 107-106; 12. Mendeleev's conference on general and applied chemistry; Moscow, USSR; 1981; Short note.
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Miscellaneous
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Conference
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