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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 14 (1995), S. 1512-1514 
    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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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 29 (1994), S. 5272-5278 
    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 ageing response of 2124 Al-SiC particulate metal-matrix composite (MMC) and unreinforced alloy has been examined using hardness measurements and Arrhenius analysis. The formation of phases during precipitation has been studied using differential scanning calorimetry (DSC). The MMC exhibits accelerated ageing compared to unreinforced alloy, due to enhanced S′ formation. The activation energy for diffusion is lower in the MMC than in the unreinforced alloy. DSC scans show Guinier-Preston B (GPB) zone nucleation to occur at a lower temperature in the MMC, whilst the total volume of GPB zones formed is smaller than in the unreinforced alloy. A model has been proposed to explain the GPB zone formation behaviour, in which ease of GPB zone nucleation varies within the MMC, as a function of ageing time and of position within the matrix. S′ formation is enhanced in the MMC because of improved diffusion and a large increase in density of heterogeneous nucleation sites compared to the unreinforced alloy.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 33 (1998), S. 3607-3614 
    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 microstructure of fibre–foil Ti–6Al–4V (composition in weight per cent) and IMI 834 matrix metal matrix composites (MMCs), and corresponding foil-bonded alloys, are investigated in relation to fabrication parameters. Higher fabrication temperatures are required in IMI 834 MMCs, which results in a thicker interfacial reaction layer than in Ti–6Al–4V MMCs. The matrix microstructure in all materials is predominantly α with intergranular β, as a result of the slow cooling rate. MMCs reinforced with SM1240 fibres exhibit boron precipitates along foil bond lines, owing to diffusion during consolidation. Fabrication using fibre mats with 7.1 fibres per millimeter (FPM) results in an excellent microstructure in (Ti–6Al–4V)–SM1240. The larger diameter of the SM1140+fibre compared with SM1240 means that (Ti–6Al–4V)–SM1140+requires FPM significantly below 7.1 in order to produce acceptable microstructural quality. The higher residual stresses in IMI 834 MMCs result in cracking of the matrix and fibre–matrix interfacial region when a FPM of 7.1 is used. Acceptable microstructural quality is observed in IMI 834 MMCs when the FPM of fibre mats is reduced to 6.3. Interfibre cracking in IMI 834–SM1140+is enhanced by a higher matrix microhardness than the other materials. This high hardness may be caused by a high matrix carbon content.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 33 (1998), S. 5499-5508 
    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 Four Ti MMCs have been tested in transverse tension, at ambient temperature and 600 °C. Generally, mechanical properties are reduced compared to monolithic Ti alloys. Transverse Young's modulus is, however, higher than in monolithic alloys, as a result of constraint of the matrix by the fibres. MMC proportional limits are associated with the onset of interfacial failure. Fibre coating cracking and longitudinal fibre splitting may also contribute to MMC yield and the associated acoustic emission peak. The fibre/matrix interface in IMI 834/SM1140+ appears to be weaker than in the other MMCs, resulting in a lower proportional limit and less acoustic emission. Final failure of the MMCs is generally via ductile shearing of matrix ligaments. The exception to this is IMI 834/SM1140+ in which the matrix fails in a brittle manner. This causes poor transverse tensile strength and failure strain in this MMC. A model to predict the MMC proportional limit, previously proposed by Jansson et al., has been modified to take account of the tensile strength of the fibre/matrix interface. The model previously used by Jansson et al. to predict the transverse tensile strength is acceptably accurate provided that the area fraction of matrix appearing on fracture surfaces is accurately determined.
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 1994-01-01
    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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