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  • 1
    Publication Date: 1998-03-01
    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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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of nonlinear science 10 (2000), S. 417-432 
    ISSN: 1432-1467
    Keywords: Key words. sine-Gordon equation, global attractor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary. The dynamical behavior of the damped sine-Gordon equation with homogeneous Neumann boundary condition is studied. It is shown that the equation has an unbounded one-dimensional global attractor in a suitable functional space when the ``damping'' and the ``diffusing'' are not very small.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 29 (1994), S. 1847-1853 
    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 Titanium aluminide alloys were prepared from cold-extruded elemental Ti and Al powders with compositions ranging from 25 to 75 at % Al. The production route in this study includes four essential steps: mixing, precompaction, cold-extrusion and reaction treatment. During reaction treatment, the intermetallic phases Ti3Al, TiAl and TiAl3 are formed by interdiffusion of Ti and Al, and pore formation takes place because of the different diffusivities of Ti and Al. The processes of phase formation, as well as pore formation, were studied by means of calorimetric, dilatometric and metallographic methods. In order to obtain nearly fully dense specimens, the technique of hot isostatic pressing was applied. The sintering behaviour and microstructures of the prepared alloys are reported.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 32 (1997), S. 6325-6329 
    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 Processes for preparing TiAl/Mo and TiAl/NiAl composites are described and results of the investigation are reported. It was found that the hardness of the TiAl/NiAl composites was largely influenced by the amount of hard ternary phases formed through reactions between TiAl and NiAl. The possibility of ductilizing and toughening TiAl by introducing molybdenum as a ductile reinforcement has also been shown. For both composites, optimal process parameters still remain to be determined by further experiments to suppress the formation of hard ternary phases, which are believed to be detrimental to ductility and fracture toughness.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 33 (1998), S. 1309-1317 
    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 presents a theoretical and experimental investigation into the oxidation reactions of Si3N4-bonded SiC ceramics. Such ceramics which contain a small amount of silicon offer increased oxidation and wear resistance and are widely used as lining refractories in blast furnaces. The thermodynamics of oxidation reactions were studied using the JANAF tables. The weight gain was measured using a thermogravimetric analysis technique to study the kinetics. The temperature range of oxidation measurements is from 1073 to 1573 K and the oxidation atmosphere is water vapour, pure CO and CO–CO2 gas mixtures with various CO-to-CO2 ratios. Thermodynamic simulations showed that the oxidation mechanism of Si3N4-bonded SiC ceramics is passive oxidation and all components contribute to the formation of a silica film. The activated energies of the reactions follow the sequence Si3N4〉SiC〉Si. The kinetic study revealed that the oxidation of Si3N4-bonded SiC ceramics occurred in a mixed regime controlled by both interface reaction and diffusion through the silica film. Under the atmosphere conditions prevailing in the blast furnace, this ceramic is predicted to be passively oxidized with the chemical reaction rate becoming more dominant as the CO concentration increases. © 1998 Chapman & Hall
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 35 (2000), S. 4289-4291 
    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 La(0.57−2x/3)Sr x Li0.3TiO3 perovskites were synthesised using a conventional solid-state reaction. Large Sr2+ ions partially substituting for La3+ ions were found to disturb the cubic perovskite structure and cause the superstructure lines to gradually decrease in the x-ray diffraction patterns and almost disappear when x = 0.12. On the contrast, there still exist superstructure diffraction spots in the electron diffraction pattern on microdomain when x = 0.12. The lithium ion conductivities of the compounds were improved in the range of 0 ≤ x ≤ 0.08, which does not obey the principle of the carrier concentration. An expansion of the unit cell and the disordering of La3+ (Sr2+), Li+ ions and vacancies in A sites could be a mechanism for the enhancement of the conductivity with Sr2+ doping.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (2000), S. 1935-1936 
    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
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 24 (1993), S. 281-286 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Qualitative and Quantitative Description of the Hardening of Iron during Tensile TestThe change of dislocation density as well as the formation of dislocation have been qualitatively and quantitatively investigated. The results obtained show that the hardening of iron during tensile test can be attributed to both the increase of dislocation density and the formation of dislocation cells. The increase of dislocation density plays a predominant roll at small deformations. With increasing deformation, the cell formation which acts like grain refining gains more and more significance. The effect of the cell formation should, therefore, be separately considered, perhaps as a kind of subgrain formation.
    Notes: Die Veränderung der Versetzungsdichte sowie die Zellbildung der Versetzungen in Armco-Eisen wurden in Abhängigkeit von der Zugverformung sowohl qualitativ als auch quantitativ untersucht. Die erzielten Ergebnisse zeigen, daß die Verfestigung von Armco-Eisen im Zugversuch auf die Erhöhung der Versetzungsdichte und die Bildung von Versetzungszellen zurückgeführt werden kann. Die Zunahme der Versetzungsdichte spielt bei geringer Verformung die vorherrschende Rolle. Mit zunehmender Verformung gewinnt die Zellbildung, deren Wirkung einer Kornfeinung ähnelt, immer mehr an Bedeutung. Daher sollte die Wirkung der Zellbildung bei starker Verformung gesondert als eine Art der Subkorn-bildung berücksichtigt werden.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 23 (1992), S. 133-138 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Fatigue Behaviour of Cu-35%Ni-3.5%Cr after Different Heat TreatmentsCu-35%Ni-3.5%Cr has been developed as a substitute for the conventional alloy Cu-30%Ni for marine applications. The Cu-Ni-Cr system exhibits a stable miscibility gap which contains the alloy Cu-35%Ni-3.5%Cr. Therefore, Cu-35%Ni-3.5%Cr can decompose in a wide temperature range. The fatigue behaviour of Cu-35%Ni-3.5%Cr was investigated over a wide decomposition range from solution treated to overaged condition both in air and argon. The most important results will he presented here in a comprehensive form.
    Notes: Cu-35% Ni-3,5% Cr wurde als Ersatzlegierung für die im Bereich der Meeres- und Schiffbautechnik eingesetzte Legierung Cu-30%Ni entwickelt. Im Cu-Ni-Cr System existiert eine stabile Mischungslücke, in der sich die Legierung Cu-35%Ni-3,5%Cr befindet. Daher ist Cu-35%Ni-3,5%Cr in einem breiten Temperaturbereich entmischbar. Das Ermüdungsverhalten von Cu-35% Ni-3,5%Cr wurde über einen weiten Bereich der Entmischung vom homogenisierten bis hin zum überalterten Zustand sowohl an Luft als auch unter Argon untersucht. Die wichtigsten Befunde werden hier in zusammenfassender Form dargestellt.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 10
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