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  • 1970-1974  (1,368)
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  • 11
    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 Thin films of several III–V and II–VI compounds as well as of some dielectrics have been vacuum-deposited using a focused beam of a CO2 or ruby laser to evaporate these materials. The crystallinity, morphology and the chemical composition of the produced thin films have been examined by various analytical methods. Films produced by the ruby laser were in most cases polycrystalline and stoichiometric, while films produced by the CO2 laser were amorphous and non-stoichiometric. Different mechanisms of evaporation leading to the observed differences in characteristics of thin films are discussed.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1970), S. 983-987 
    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 distribution of surface crazes in the vicinity of a stationary edge crack in a polystyrene sheet in tension is compared with the stress fields already investigated experimentally by Post. It is shown that the extent of crazing corresponds closely with the maximum principal stress contours determined experimentally and that the shapes of the crazes indicate that they grow along directions parallel to the minor principal stress axis.
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  • 13
    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 fibrous eutectic with Co fibres embedded in a Au-matrix can be obtained at G/v ≥ 2×105 deg/cm2 whereG = temperature gradient andv = growth velocity. Interfibre spacing 2R can be described byR 2 v=1.2×10−11 cm3/sec. Below G/v=2×105 deg/cm2 cellular growth is observed. Fibre to blade transitions have been found over the entire range of growth velocities employed, i.e. between 10−5 and 10−2cm/sec and are thought to be due to local growth perturbations. Composite growth under the influence of a magnetic field produces two effects: an orienting effect and a shape and size modification. Orienting occurs at slow growth rates, preferably, in hypereutectic alloys and is explained as a magnetic aligning of the ferromagnetic primary Co-precipitates. The shape and size modification which results in thick and segmented, caterpillar-like Co fibres, appears to be independent of growth rate (within the limits indicated above), occurs mainly in cell boundaries at all compositions, including hypoeutectic ones, and is thought to be due to a field induced enhancement of local temperature gradients.
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1970), S. 1038-1042 
    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 Single crystals of MgO have been heated with crystals of Al2O3, Fe2O3 and TiO2 on cut and polished faces, in known relative crystallographic orientations. The initial product in every case was a spinel phase witha 0=8.38 Å, oriented with its axes parallel to those of MgO. Crystals reacted in different orientations gave the same product, but kinetic rates appeared to differ. CaO and TiO2 crystals, treated in the same way, gave an unoriented product.
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  • 15
    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 Ga/In/P ternary phase diagram is calculated. A regular solution is assumed for binary solubility and the derived interaction parameters are used to calculate the deviation from ideality of the ternary system using a quasi-regular solution model. Comparison is made between theoretical and experimental results on liquid epitaxial layers. It is suggested that a solid/solid miscibility gap in the Ga/In/P system is a distinct possibility.
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1970), S. 1047-1053 
    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 Thermal analysis, metallographic, and X-ray procedures were used to investigate the Sn-Sn4As3-SnTe subsystem of the ternary system tin-arsenic-tellurium. The subsystem is of the simple eutectic type with no ternary compound formation. A binary eutectic valley runs across the diagram from the Sn4As3-SnTe binary eutectic at 576.5°C to a ternary eutectic which is indistinguishable from the Sn4As3-Sn binary eutectic at 231.3°C with 0.5 wt % Sn4As3 and 99.5% Sn. More than 90% of the compositional area is dominated by the primary freezing of an SnTe-rich phase, and an Sn4As3-rich phase is the first to crystallise from the melt over most of the remaining area. Terminal solid solutions are very restricted.
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 6 (1971), S. 390-394 
    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 “Wallner Line” effect on the fracture surface of silicon is described and is used to determine a maximum fracture velocity of (3800 ± 400) m/s or (0.75 ± 0.07)v t. The mirror energy of silicon is also measured. The values are compared with those for glass and other materials and are shown to be consistent with a solid whose crack branching angle is restricted to 70
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  • 18
    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 systematic analysis is made of the possible free energy diagrams for a binary titanium alloy consisting of a metastable beta phase, which tends to form either the alpha or the omega phase, or both. The predictions based on each of the possible free energy diagram configurations are compared with the available experimental data. Arguments are developed to show that it should be possible to nucleate an omega phase having an initial solute content less than the metastable equilibrium value and not necessarily a higher solute concentration, as suggested by other investigators. It is further shown that the observed precipitation of a solute-lean beta phase in certain binary and ternary beta alloys cannot be explained in terms of an ordinary miscibility gap resulting from a preference for bonds between like atoms rather than bonds between unlike atoms. An explanation is suggested on the basis of an early model proposed by M. K. McQuillan in which the electronic structure of the titanium atom can change with temperature leading to two possible types of bonding behaviour.
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  • 19
    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 Single crystals of an arsenic-antimony solid solution have been grown at the minimum melting point (612
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  • 20
    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 carbon fibre reinforced nickel composite has been fabricated, and some of the mechanical properties investigated. The composite contains some misaligned and broken fibres, and a poor bond exists between the carbon fibre and the nickel. The mechanical properties are, to a very large extent, influenced by these factors. The oxidation resistance was found to be poor, and therefore a serious limitation for high temperature use.
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