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  • 11
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 29-31 (Jan. 1991), p. 291-302 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 127-131 (Nov. 1996), p. 671-678 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 3 (1984), S. 1095-1096 
    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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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 31 (1996), S. 4221-4226 
    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 combustion synthesis of MoSi2 from elemental powders was investigated. Higher completion of the reaction was achieved by the use of prior compaction of powders and higher heating rates. The reaction mechanism was studied by performing experiments at a heating rate of 20 K/min. It was established that reaction occurred via capillary motion accompanying the flow of molten silicon to the molybdenum powder particles. During the synthesis of MoSi2/TiC composites, two ternary (Mo,Ti) Si2 phases were observed, in contradiction to the thermodynamic predictions of the Mo-Si-Ti-C system. Combustion synthesis of (Mo, W) Si2 yielded an inhomogeneous product where the composition of the solid solution varied throughout the sample. These observations were discussed in terms of the characteristics of the reaction process.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 26 (1991), S. 1497-1504 
    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 Contamination with copper particles of the surfaces of rapidly solidified Mg-3.5 wt% Al alloy splats during processing is discussed. Two batches of splats produced with copper substrates of different surface finish, were examined by atomic absorption spectrometry (AAS), electron probe micro-analysis (EPMA) and Rutherford back scattering (RBS). Lower copper content was detected on the well-polished splats (splats B) by AAS, while EPMA and RBS analysis with a micro-beam showed fine copper particles on the surfaces of the splats prepared with pistons of inferior surface finish (splats A). Immersion corrosion tests carried out in a 3% NaCl solution saturated with Mg(OH)2 resulted in higher pit density and earlier pitting times for splats A. Pitting is associated with copper particles (splats A) and with surface cracks and macro-porosity (splats A and B). A mechanism for pitting is suggested in which Mg(OH)Cl is envisaged to be an intermediate reaction product before decomposing to Mg(OH)2 in the pitting process.
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 29 (1994), S. 141-150 
    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 mechanical properties of two-phase composites are predicted using a rigorous continuum mechanics analysis and an equivalent microstructural transformation approach. This leads to a generalized law of mixtures which is contrasted with the classical linear law of mixtures which requires some explicit assumptions. The generalized law of mixtures enables prediction of a variety of mechanical properties of a two-phase composite with any volume fraction, grain shape and phase distribution. It is shown that the classical linear law of mixtures is a specific case of the generalized law of mixtures. Examples are given from continuous Cu-W composites, the particulate Co-WC system, Al/SiCp composites, α-β Ti-Mn alloys and α-β Cu-Zn alloys for the predictions of properties such as Young's modulus, yield strengths, flow stresses, the overall friction stresses and the overall Hall-Petch coefficients. It is shown that the theoretical predictions by the generalized law of mixtures are in very good agreement with the corresponding experimental results drawn from the literature, for both continuous fibre composites and particulate reinforced systems.
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 14 (1979), S. 1421-1424 
    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 aspect ratio was measured on simple hexagonal prisms in the sediment from condensation aerosols of Cd and Zn. For Cd the ratio R=p√3/p, where p and q are the respective lengths of the prism edges parallel and perpendicular to the basal pinacoid, varies symmetrically above and below a most frequent value of 1.2 to 1.3. The corresponding R-distribution for Zn was broader, less symmetrical and peaked at 1.5 to 1.6. Similar results had been found with hexagonal bubbles of Ar in annealed foils of these metals and interpreted as denoting the equilibrium shape. In the condensation of aerosols, however, crystals grow from the vapour under highly non-uniform conditions, and the constancy of aspect ratio is attributed to the operation of a dendritic growth mechanism as put forward by Buckle and Pointon.
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 15 (1980), S. 2921-2924 
    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 In a previous paper it was concluded from microscopical evidence that the radius of a basal raft nucleated on a freezing droplet of Zn or Cd expands to a fixed fraction of the droplet radius before thickening into a grain. Further studies on polycrystalline spheres from condensation aerosols, together with observations by other investigators working with much larger, sessile drops, confirm that the raft remains quite thin while the radius is expanding. Additional surface features developed by epitaxial growth from the vapour on monocrystalline aerosol spheres show that in the following stage, in which the raft thickens but its upper surface no longer expands, the growth front propagates into the melt by the build-up of layers parallel to c. Evidence of a growth helix is found opposite the basal flat. Its formation is attributed to growth on a screw dislocation generated by the stress that accumulates at the perimeter of the expanding raft. The onset of rapid helical thickening coincides with termination of raft expansion. Differences in evaporation behaviour of particles are considered to depend on whether the dislocation remains in the solidified droplet or is expelled by thermal stresses. Glide of the same dislocations may be involved in the slip previously observed in polycrystals.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 16 (1981), S. 1103-1107 
    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 strain energy developed by surface stresses in a crystalline raft of basal orientation floating on a droplet of melt is calculated and compared to the strain energy of a screw dislocation situated on the raft axis. The suggestion that a dislocation is generated at a characteristic value of the raft/drop radius ratio is tested by making the comparison for arbitrary values of raft aspect ratio and Burgers vector. When b = c, the lattice parameter of the hexagonal crystal, the energies are equal at a combination of aspect ratio and radius ratio that fits experiment. The apparent height of the helical growth step greatly exceeds this value of b and remains to be explained, but the results confirm that a high growth rate anisotropy is required initially to produce the dislocation.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 5 (1986), S. 981-983 
    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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