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  • 1970-1974  (1,368)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1970), S. 918-918 
    ISSN: 1573-4803
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1970), S. 921-923 
    ISSN: 1573-4803
    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
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  • 3
    ISSN: 1573-4803
    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
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  • 4
    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 This paper questions the efficiency of the present approach to the search for new materials which consists of studying only one composition at a time. A new concept of materials research is introduced which consists of synthesising, analysing, testing and evaluating of large parts of multicomponent systems in single steps. Implementation of this concept has been possible through the development of a one-cathode, multiple-target, radio-frequency co-sputtering method of synthesis and of a novel, simple method of compositional analysis of any co-sputtered film, based on film thickness measurements. An example is given of the use of such an approach in studying new binary super-conducting compositions, which resulted in a thirty-fold increase in the rate of finding new materials. A several hundred-fold increase in research productivity is predicted for higher-component systems.
    Type of Medium: Electronic Resource
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  • 5
    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 tensile properties of nickel-coated Grafil “HT” carbon fibres were studied as a function of the coating thickness, taking into account the diameter-dependence of the properties of the fibres themselves. The stress-strain curve exhibited three stages, following from an initially elastic coating which yields and then extends plastically before failure of the fibre. The behaviour could be described by a simple law of mixtures and the grain size of the coatings.
    Type of Medium: Electronic Resource
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  • 6
    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 Measurements of grain boundary sliding have been made on polycrystalline specimens of Magnox AL80, a magnesium-0.78 wt% aluminium alloy, at successive strains during creep at 200° C under a stress of 2800 psi. Three independent methods were used to determine the strain due to sliding (ε gb) at the surface and two to determineε gbin the interior of the specimens. The one direct method of measuringε gbin the interior used oxide markers introduced by extruding a composite billet. The values ofε gbobtained from the offsets in these interior markers were found to agree with those given by the three sets of measurements made on the surface, but not with those from the indirect method for the interior which relies on the measurement of grain strain via grain shape changes.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1970), S. 925-932 
    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 Crazing in glassy plastics is attributed to a stress-activated devitrification of a small amount of material at the tip of a chance nick or flaw, to a softer rubbery state. Subsequent cavitation of the softened material is then assumed to take place under the action of the same dilatant stress responsible for its formation. A transition to ductile yielding is proposed to occur when the material in the tip region undergoes large deformations before softening. The proposed mechanism of crazing is shown to provide quantitative predictions for the magnitude of tensile stress at which crazing occurs, the increase in crazing stress with hydrostatic pressure, the transition at high pressures to a yielding process without crazing, the reduction in crazing stress in the presence of certain liquids and vapours and, to some extent, for the effects of temperature and pre-orientation. These theoretical predictions are found to be in reasonably satisfactory agreement with experiment. In view of the limited number of adjustable parameters in the theory (the principal one being the stress-magnification factor associated with a typical nick or flaw), this general agreement over a wide range of experimental conditions and variables suggests that the proposed mechanism of stress-crazing is basically correct.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1970), S. 951-954 
    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 Directional eutectoid decomposition in a Cu-11.8 wt % Al alloy at a rate of 7×10−5 cm/sec produced eutectoid colonies several inches in length, with lamellae parallel to the temperature gradient. Average lamellar spacing was 4000 Å. Significantly faster driving speeds produced martensitic structures. The maximum rate of eutectoid decomposition and the spacing observed were in agreement with earlier data from isothermal studies.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1970), S. 955-959 
    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 kinetics of isothermal β-α′ martensitic transformation in the U−0.45 wt % Mo alloy has been investigated. The specimens were quenched from the β region (690° C) and held isothermally at temperatures from 120 to − 196° C (liquid nitrogen). By quantitative metallographic methods the percentage of the newly formedα′-phase was determined and the half-thicknessc and radiusr of plates calculated. The activation energy for nucleation period was estimated. It was found thatΔG depends linearly on temperature. The nucleation rateN was determined to be a parabolic function of temperature. A part of the T-T diagram below theM s temperature was determined.
    Type of Medium: Electronic Resource
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  • 10
    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 Observations of electron damage occurring in LiF single crystals within an electron microscope are recorded. A number of irradiation-induced defects, similar to those reported by other workers were observed, but a new feature is the identification, by electron diffraction, of Li2O distributed in precipitates and as a dispersed phase.
    Type of Medium: Electronic Resource
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