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  • 1
    Electronic Resource
    Electronic Resource
    Tensile strength of Armco iron-ETP copper diffusion bonds (1989)
    Springer
    Journal of materials science 8 (1989), S. 137-140 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730704
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  • 2
    Electronic Resource
    Electronic Resource
    Solid-state transformations during diffusion bonding of copper to iron (1988)
    Springer
    Journal of materials science 23 (1988), S. 1231-1236 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Solid-state bonding between dissimilar metals, produced at elevated temperatures with the application of a bonding pressure, causes structural changes in the microstructure of the zones nearest to the bond interface. These metallurgical transformations, produced by interdiffusion in the vicinity of the bond, decide the final properties of the joint. In the present paper, such diffusional transformations have been investigated for diffusion-bonded joints of Armco iron and copper with different oxygen contents (ETPC and OFLPC). The formation of iron oxide (wustite) has been observed in the ETPC-Armco iron joints. This oxide did not appear in OFLPC-Armco iron diffusion-bonded joints. This suggests that iron oxide forms by reaction of iron with oxygen dissolved in the ETPC base metal. The formation of copper particles in the iron base matrix, near the bond interface, has been observed. This may be due to two different processes: the solid-state precipitation of copper into iron and the eutectoid reaction (γ →ε +α) at bonding temperatures above 900° C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01154583
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  • 3
    Electronic Resource
    Electronic Resource
    Special features of the formation of the diffusion bonded joints between copper and aluminium (1988)
    Springer
    Journal of materials science 23 (1988), S. 2273-2280 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A metallographic study of diffusion bonds between aluminium and copper has been made in order to further understanding of the mechanism of bond formation for joints between dissimilar metals that form intermediate phases or intermetallic compounds. A three-stage mechanistic model based upon sintering principles has been proposed to explain this kind of diffusion joint.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01115800
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  • 4
    Electronic Resource
    Electronic Resource
    Diffusion bonding of grey cast iron to ARMCO iron and a carbon steel (1989)
    Springer
    Journal of materials science 24 (1989), S. 4152-4159 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructure transformations produced during the diffusion bonding of grey cast iron to pure iron (ARMCO iron) and to a hypoeutectic steel (0.55% C) have been studied. The indirect determination of the carbon concentration profiles has produced a diffusion equation that relates the microstructure of the bond interface to the bonding temperature and time. A new tensile test specimen is described; this specimen has a variable circular section which allows the determination of true tensile strength of dissimilar diffusion bonds. Metallographic and fractographic studies have shown that the optimum bonding conditions for both types of joint are a bonding temperature at 980° C, for 5 min at a bonding pressure of 4.5 MPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01168988
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  • 5
    Electronic Resource
    Electronic Resource
    Diffusion bonding of Ti-6Al-4V alloy at low temperature: metallurgical aspects (1992)
    Springer
    Journal of materials science 27 (1992), S. 391-398 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The diffusion bonding of the Ti-Al-4V alloy at low temperature (850°C) has been studied. The principal objective of this investigation was the development of a diffusion bonding procedure suitable for Ti-6Al-4V alloy and capable of being used as part of a superplastic forming/diffusion bonding process. It was found that high-quality joints can be obtained by bonding at 850°C, with pressures of 4 MPa and times in the range 90–120 min. Mechanical properties of the joints were determined using cylindrical and plane test pieces. Tensile, shear and peeling tests were used to determine the strength of the joints. On bonding with the above conditions, the parent alloy strength was reached. Little reduction in these values was measured because the heat treatment was applied during bonding. A metallographic study by scanning electron microscopy and energy dispersive spectroscopy was performed to determinate the influence of the previous parameters on the microstructural changes that occur in the joint. Grain growth kinetics and ratio of bonding area were also studied. The results shows that a new method of diffusion bonding for Ti-6Al-4V alloy has been developed. This method can be carried out using lower bonding temperatures than in conventional processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543928
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  • 6
    Electronic Resource
    Electronic Resource
    Spectroscopy of calcium deposited on large argon clusters (2002)
    Springer
    The European physical journal 21 (2002), S. 153-161 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 36.40.-c Atomic and molecular clusters – 82.33.Hk Reactions on clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Spectroscopic experiments have been performed, providing emission and excitation spectra of calcium atoms trapped on argon clusters of average size 2 000. The two experimental spectra fall in the vicinity of the calcium resonance line 1P 1 → 1S0 at 422.9 nm. The excitation spectrum consists in two bands located on each side of the resonance line of the free calcium. In addition, Monte Carlo calculations, coupled to Diatomics-In-Molecule potentials are employed to simulate the absorption spectrum of a single calcium atom in the environment of a large argon cluster of average size 300. The theoretical absorption spectrum confirms the existence of two bands, and shows that these bands are characteristic of a calcium atom located at the surface of the argon cluster and correspond to the excited 4p orbital of calcium either perpendicular or parallel to the cluster surface. The precise comparison between the shape of the absorption spectrum and that of the fluorescence excitation spectrum shows different intensity ratios. This could suggest the existence of a non adiabatic energy transfer that quenches partly the fluorescence of trapped calcium. Another explanation, although less likely, could be a substantial dependence of the calcium oscillator strength according to the alignment of the calcium excited orbital with respect to the cluster surface. The emission spectrum always shows a band in the red of the resonance line which is assigned to the emission of calcium remaining trapped on the cluster. When exciting the blue band of the excitation spectrum, the emission spectrum shows a second, weak, component that is assigned to calcium atoms ejected from the argon clusters, indicating a competition between ejection and solvation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjd/e2002-00201-5
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  • 7
    Electronic Resource
    Electronic Resource
    Structure of nitrogen molecular clusters (N2)n with 13≤n≤55 (1999)
    Springer
    The European physical journal 9 (1999), S. 189-193 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 36.40.Mr Spectroscopy and geometrical structure of clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We investigate the structural properties of nitrogen molecular clusters (N2) n using classical Monte Carlo simulations and optimization methods. As is the case for argon clusters, we find polyicosahedral (anti-Mackay) geometries above 13 molecules, and multilayer icosahedra with uncomplete outer shell (Mackay) geometries below 55 molecules. The crossover point between these two kinds of structures is located near 42 molecules, whereas it is at only 31 for argon. With a simple three-body (Axilrod–Teller) potential added to the standard Lennard–Jones model, we interpret this difference as the result of the strong anisotropy of the molecular potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050424
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  • 8
    Electronic Resource
    Electronic Resource
    Monte-Carlo simulations of rotating clusters (1998)
    Springer
    The European physical journal 3 (1998), S. 229-236 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 36.40.Ei Phase transitions in clusters- 82.30.Qt Isomerization and rearrangement- 05.20.Gg Classical ensemble theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A new scheme for estimating densities of states at non zero angular momentum is proposed, using the Monte-Carlo (MC) and multiple histogram methods. It is based on a rigorous expression of the classical density of states for a rotating system. Two features appear: the centrifugal energy ( angular momentum and I the instantaneous inertia tensor in the center of mass reference frame) is added to the potential energy and the configurational densities of states is weighted by . Comparing the MC results for the 13-atom Lennard-Jones cluster and a calculation based on molecular dynamics (MD) shows that this weight is important if the rotation induces a structural change at a finite temperature. The MC algorithm proves to be much more efficient than MD, even at finite .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050170
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  • 9
    Electronic Resource
    Electronic Resource
    Evidence for dependence of the sticking cross-section of atoms on small and medium-size van der Waals clusters (2000)
    Springer
    The European physical journal 8 (2000), S. 265-272 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 34.50.-s Scattering of atoms, molecules, and ions - 36.40.-c Atomic and molecular clusters - 64.60.Qb Nucleation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: This paper introduces a simple model describing the cluster growth in supersonic expansions. The predicted terminal mean cluster size is compared to the available data in the case of argon. The agreement between the model and the experimental results requires that the cross-section describing the sticking of an atom on a cluster of size N scales like with in the range 0.34-0.44, well below the predicted by the simplest geometrical scaling argument. We explain this unexpected result in two steps. First, using Monte Carlo simulations, we check that the potential between an atom and a cluster is accurately represented by the Gspann and Vollmar potential, even at finite temperature. Then, using Langevin's approximation, we show that the sticking cross-section scales like N 1/3 for small to moderate N values and switches to the geometric scaling N 2/3 for very large N values. The crossover between these two scalings occurs when for argon, but the mean exponent over the size range 1-104 is 0.46. This N scaling of the sticking cross-section should play an important role whenever condensation is important as it modifies the kinetics of the early stages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050035
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  • 10
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    Diffusion bonding of Ti-6Al-4V alloy at low temperature: metallurgical aspects (1992)
    Springer
    Details
    Publication Date: 1992-01-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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