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  • 1965-1969  (430)
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  • 1
    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 Glasses of compositions lying in the immediate neighbourhood of the tie-line between Li2O, 2SiO2 and Li2O, 2B2O3 have been investigated by DTA. The endotherm peak temperatures were shown to be in general agreement with the eutectic and liquidus values proposed by Sastry and Hummel. These glasses were devitrified by heat treatment at the exotherm peak temperatures and the crystalline products were determined by X-ray diffraction analysis. Certain compositions near to the eutectic, and within the two-liquid field, devitrifled to give three or four crystalline phases. The resultant material in each case was hard and non-porous and of potential use as a glass-ceramic. Compositions in the lithium diborate field also devitrified to give well-sintered products.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 1 (1966), S. 79-90 
    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 Quantitative size-factors, defined in terms of the effective atomic volume of the solute, have been calculated for 469 substitutional solid solutions using precision lattice parameter data available in the literature. Values of the volume size-factor, its linear derivative and a parameter expressing the deviation from Vegard's law, are tabulated in alphabetical order of the solvents. The application of these size-factors is discussed in relation to a number of physical, chemical and mechanical properties of solid solution alloys.
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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
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 1 (1966), S. 115-116 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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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: Conclusions The experimental method described permits the coercive force/thickness relationship to be reliably determined, and avoids the problems encountered by previous techniques. The experimental values of the critical thicknesses, t 3 and t 4, at which coercive force anomalies occur, allow the determination of the exchange constant for the magnetic material. Coercive force monitoring during deposition enables films to be prepared with the desired magnetic parameters for computer storage systems. The method is also a useful tool for determining the critical thickness of an intermediate, non-magnetic layer separating two ferromagnetic thin films.
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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 Tubular specimens of vitreous carbon and of pyrolytic graphite, heated in nitrogen or helium for several minutes at 2850 to 3100° K by RF induction, developed a “skin” of crystalline carbon, nodular in appearance and apparently growing into the carbon from the surface. The vitreous carbon was isotropic, with no preferred orientation of “crystallites”; the pyrolytic graphite had a preferred orientation of basal planes at right angles to the axis of the specimen, so that curved surfaces were composed predominantly of edge atoms. X-ray diffraction studies of the skin indicated that it was partially graphitised and strongly orientated with basal planes parallel to the surface. The mechanism of the reorientation process is as yet not clear, but the driving force may be a change in surface free energy.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 1 (1966), S. 199-210 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 1 (1966), S. 219-228 
    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 Indium antimonide specimens were plastically bent to introduce an excess of dislocations having either In-atoms at the edge of their extra half-planes or having Sb-atoms there. The lower yield stress for bending at 270°C was dependent on the direction of bend, being greater when specimens were bent to produce excess Sb-dislocations. Bent specimens were annealed and the etch-pit densities in them compared with theoretical prediction. It was found that a modified CP4 etch containing butylamine gives a reliable estimate of the total dislocation density (i.e. shows up both In- and Sb-dislocations), whilst the modified CP4 etch without butylamine reveals all the In-dislocations and about half the Sb ones.
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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 The inversion twin is an uncommon fault that potentially can be found in the wurtzite- and sphalerite-type crystal structures and related rhombohedral structures, all of which are hemimorphic and possess a polar axis parallel to the c-axis. The twin structure involves exact inversion of the sense of polarity across a transition region (boundary) of variable orientation and complexity. Although several examples of possible but uncertain occurrence of the twin have been noted in other materials, only in beryllium oxide crystals has it been found to occur with abundance and on a macroscopic scale. The inversion twin, as it occurs in BeO, is described in detail. Existence and geometry of the twin is evident from crystal morphology and chemical and mechanical properties. It is suggested that the twin boundary may be stabilised and its energy lowered by the presence of aliovalent impurities along the boundary. Relation of the inversion twin to other types of faults is considered briefly. Previous discussions and presentation of new data in up-to-date assessment of the inversion twin are reviewed.
    Type of Medium: Electronic Resource
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