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Thursday, August 6, 2020 | History

2 edition of Point defects quenched in NiAl and related intermetallic compounds found in the catalog.

Point defects quenched in NiAl and related intermetallic compounds

Jiawen Fan

Point defects quenched in NiAl and related intermetallic compounds

by Jiawen Fan

  • 313 Want to read
  • 10 Currently reading

Published .
Written in English

    Subjects:
  • Intermetallic compounds -- Defects.,
  • Intermetallic compounds -- Quenching.,
  • Aluminum compounds -- Defects.,
  • Aluminum compounds -- Quenching.,
  • Point defects.

  • Edition Notes

    Statementby Jiawen Fan.
    The Physical Object
    Paginationx, 93 leaves, bound :
    Number of Pages93
    ID Numbers
    Open LibraryOL16905022M

    M. Kogachi, T. Haraguchi, and S.M. Kim, Point Defect Behaviour in High Temperature Region in the B2-Type Intermetallic Region Compound FeAl, Intermetallics, Vol 6, .   The melting point of bulk B2 NiAl intermetallic with the EAM potential was estimated at about K by Kerrache et al. There were , atoms in the initial B2 NiAl simulation box with dimensions of nm × nm × nm. Periodic boundary conditions were applied in .

    The attractive physical and mechanical properties of ordered intermetallic alloys have been recognized since early in this century. However, periodic attempts to develop intermetallics for structural applications were unsuc­ cessful, due in major part to the twin handicaps of inadequate low-temper­ ature ductility or toughness, together with poor elevated-temperature creep strength. Point defect properties have been studied for B2-type Co1-c Fe c alloys ( ≤ c ≤ ) by X-ray diffraction and density measurements. The lattice constant increases with increase in composition c and indicates a distinct change in the slope beyond c = Further, it shows a decrease with increase in quenching temperature.

    Abstract: Triple-defect formation in B2-ordered binary A-B intermetallic compounds results fromthe asymmetry between the formation energies of A- and B-antisite defects. Chemical disorderingin such systems is strictly correlated with vacancy formation, which is . ordered NiAl, the Fe atoms may occupy either the Ni or the AI sublattice depending on compo- sition [3,4]. Another complication is that in many intermetallic compounds there are numerous point defects present, e.g. anti-site defects and vacancies [5]. These defects arise from consti-.


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Point defects quenched in NiAl and related intermetallic compounds by Jiawen Fan Download PDF EPUB FB2

The behaviour of point defects has been investigated in quenched B2-FeAl intermetallic compounds by using magnetic susceptibility measurements χ(T) and differential scanning calorimetry (DSC).During an isochronal annealing, the observed step in magnetic susceptibility at about °C reflects the migration of iron antistructure atoms, frozen by the quenching process, to their Cited by:   Point defects in the highly ordered B2 compounds NiAl, CoAl and FeAl were studied using the perturbed gamma-gamma angular correlations (PAC) technique.

Quadrupole interactions detected at dilute In probes on Al sites in NiAl and CoAl were identified with complexes containing one or two vacancies in the first atomic shell.

Measurements on rapidly quenched NiAl and CoAl Cited by: 1. The B2 type intermetallic compounds consisting of VIII and IIIb component atoms, such as the NiAl and CoAl, exhibit different types of point defects with deviation of alloy composition from the. VACANCY DEFECTS IN THE ORDERED COMPOUND NiAl* A.

BALLft and R. SMALLMANf Vacancy precipitation effects in the form of small dislocation loops and helical dislocations have been observed in quenched and aged samples of the intermetallic compound by: Point defects in intermetallic compounds, particularly NiAl, have been studied intensively by computer simulations during the last 5 years (Murch and Belo va, ; Korzhavyi et al.

Point defect hardening in binary B2 intermetallic compounds with the anti-structure defect structure (FeCo and AuZn) and the triple defect structure (NiAl, FeAl, and CoAl) was investigated. Thermodynamic modeling combined with experimental measurements of lattice parameters and bulk densities were used to establish point defect concentrations.

constitutional defects, i.e. constitutional vacancies and antisite defects [3]. Defects In B2 Intermetallic Compounds The homogeneity is retained to high temperatures at even large deviations from the stoichiometric composition, the defect formation in intermetallic compounds is.

From thermodynamic data on seven CsCl-type intermetallic nonstoichiometric compounds, the nature of the defects present has been deduced and the defect concentrations, and free energies, enthalpies, and entropies of defect formation have been calculated. The compounds discussed include AuCd, AgMg, AuZn, FeAl, NiAl, CoAl, and PdAl.

It is shown that the thermodynamic activities across the. The aim of the present paper is thus to determine the defect structure appearing in the B2 type intermetallic compounds CoAl as a function of composition from the XRD and density measurements. POINT DEFECT BEHAVIOR Vol.

35, No. 7 Experimental and Analysis Procedures Seven alloys ,; ( Defects or Imperfections in crystalline solid can be divided into four groups namely line defects, point defects, volume defects and surface defects.

Historically, crystal point defects were first regarded in ionic crystals, not in metal crystals that were much simpler. There are 3 types of point defects: Stoichiometric defect. Point Defect. Point defects involve a single atom or small cluster of atoms and are, in turn, subdivided into two types: ‘vacancies’, where an atom (or in an ionic substance an atom pair, to conserve charge balance) is missing, and ‘interstitials’, where the extra atom is situated in.

Request PDF | OnH.-E. Schaefer and others published Intermetallics: Point Defects | Find, read and cite all the research you need on ResearchGate. H.-E. Schaefer, K. Frenner, and R. Würschum. Time-Differential Length Change Measurements for Thermal Defect Investigations: Intermetallic B2-FeAl and B2-NiAl Compounds, a Case Study.

Phys. Rev. Lett. 82, (). ADS CrossRef Google Scholar. Point defect hardening in binary B2 intermetallic compounds with the anti-structure defect structure (FeCo and AuZn) and the triple defect structure (NiAl, FeAl, and CoAl) was investigated.

Perturbed γ-γ angular correlation spectroscopy was applied to study the structure and properties of point defects nearIn probes in quenched and annealed NiAl samples with five compositions in the range cNi=48–52%. Quadrupole interaction signals are analysed in terms of near-neighbor Ni-vacancy and nextnear-neighbor Ni antisite atom defects.

The ASB mechanism is dominant at large deviations from thermodynamic arguments in terms of specific point defects in this class of intermetallic compounds, it was shown that a. The point defect behavior in B2-type intermetallic, and its relating structural, physical and mechanical properties are surveyed, especially focusing on the investigations made in 's.

It is recognized that there is a strong correlation between the point defects and various properties. For example, the mechanical properties (hardness) could sfully related to retained vacancy.

B2-NiAl melts congruently. Experimental data for the melting point of Ni 3 Al vary from to K 63 Huang, W and Chang, YA. Intermetallics, 6: [Google Scholar]. There is even a controversy about whether this compound melts congruently or via a. Nickel aluminide is an intermetallic compound with important technological applications because of its light weight as well as its resistance to oxidation, corrosion, structural deformation, and yield strength at high temperatures.

1–6 1. Liu and J. Stiegler, Science (), – (). NPTEL provides E-learning through online Web and Video courses various streams. general trends for a series of B2 compounds as well as TiAl. The potentials used correctly predict the proper mechanism of compositional disorder of these compounds.

Using these potentials, point defects, free surface energies and various grain boundary structures of similar energies in three B2 compounds, FeAl, NiAl and CoAl were [email protected]{osti_, title = {Theoretical and positron annihilation study of point defects in intermetallic compound Ni{sub 3}Al}, author = {Sun, Jian and Lin, Dongliang}, abstractNote = {The equilibrium equation of point defects in Ll{sub 2} types of intermetallic compounds was established in a new simple method, which is independent of the chemical potentials.High Temperature Intermetallic Compounds Ni3AI M.

Kursa, L. HypeskB, J. DrBpala, T. K&n& and M. LosertovB VSB, Technical University Ostrava, av. listopadu, 33 Ostrava-Poruba, Czech Republic Abstract.

The paper describes the preparation of Ni3A1 intermetallic compounds, and .