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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Ultramicroscopy 12 (1983), S. 269 
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 25 (2002), S. 0 
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Some fatigue phenomena are discussed, which are because of diffusionless transformation of metastable metallic phases. The following aspects are relevant to high-cycle fatigue resistance: (i) crystallographic reversibility (shape memory alloys, SMA), or irreversibility, with change in volume (austenitic steels) of the martensitic transformation; (ii) mechanical, thermal, thermomechanical cycling; (iii) effects on crack nucleation or growth because of the structural instability; and (iv) fatigue of functional properties (shape memory, transformation temperatures). Micromechanical models are proposed in order to define the conditions for considerable retardation of crack initiation and early stages of crack growth. Special aspects as the role of heat flow (SMA) or localized formation of a ferromagnetic phase at the crack tip (steels) are discussed briefly.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 18 (1995), S. 0 
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Fatigue crack growth under constant and random loading conditions was investigated for a metastable austenitic-bainitic steel in comparison with a ferritic chromium steel at very low crack growth rates. Experimentally determined random crack growth was compared with linear Miner calculations on the basis of constant amplitude results. It was found that the measured crack growth rates in transforming material are a factor of 10 lower than the calculated values, whereas the difference is only a factor of 2 for the ferritic steel. The reason for the pronounced crack growth retardation in the metastable alloy is transformation of part of the austenitic phase into martensite in the stress field of the crack tip, accompanied by a volume increase and, consequently, residual compressive stresses. Rare high load cycles in the random sequence increase the closure level, which then leads to pronounced retardation of fatigue crack growth for the numerous successive low amplitude cycles.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 8 (1989), S. 37-40 
    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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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 8 (1989), S. 191-193 
    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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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 9 (1990), S. 112-115 
    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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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (1984), S. 1343-1348 
    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 effect of titanium additions to binary β-CuZn alloys was investigated: the concentration range of β at high temperatures (860° C), solid solution hardening of this phase, and the change in martensite temperature,M s. Titanium in solution produces considerable solid solution hardening, both by replacing copper or zinc. Only replacement of zinc leads to a constant or increasingM s, while replacing copper decreases it. Ageing of the β-phase causes strong hardening and a decrease inM s. The results have been interpreted considering the role of thermodynamic and mechanical properties in determiningM s.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 18 (1983), S. 127-132 
    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 Crystallization reactions which start in an amorphous or crystalline phase are compared. The following three elementary mechanisms are distinguished: (a) structural transformation of the total volume: massive transformation, polymorphous crystallization; (b) partial preservation of the matrix and local changes in composition: precipitation, primary crystallization; (c) combinations of transformation and decomposition: eutectic and eutectoid reactions. Necessary and sufficient conditions for the occurrence of these reactions are discussed with special concern for metastable equilibria and kinetics which control crystallization of metallic glasses.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 112 (1992), S. 245-250 
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 35 (1985), S. 193-205 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The strengthening mechanisms of alloys composed of more than one phase are discussed in a systematic manner. A definition is proposed for certain types of microstructures. Plastic strain of fine dispersion structures (precipitation-hardened alloys) can vary between homogeneous and extremely localized in a few slip bands. There are consequences of localization on yield and fracture stress, static and cyclic work-hardening ability, fatigue crack initiation, and propagation. A distinction is required between fine and coarse two-phase structures. While the strength of the former can be adequately treated with dislocation theory, the latter require a micromechanical approach similar to that of composite materials. As examples will serve some aspects of strength of alloys with dual phase and duplex structures. Finally, it is shown that the microstructure leading to maximum yield stress need not be identical with that of optimum wear resistance.
    Type of Medium: Electronic Resource
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