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  • 1
    Electronic Resource
    Electronic Resource
    Dislocation energies and mobilities in B2-ordered Fe-Al alloys (1987)
    Springer
    Journal of materials science 22 (1987), S. 607-611 
    Details
    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 Anisotropic elasticity theory was used to calculate the energies and mobilities of dislocations belonging to the slip systems {1 1 0} 〈 1 1 1 〉 and {1 1 0} 〈1 0 0〉 in B2-ordered Fe-Al alloys. Based only on the energy values, it was not possible to predict the experimentally observed room-temperature slip system {1 1 0} 〈1 1 1〉. However, when the mobility parameter, as modified by the consideration of atomic radii ratioR Fe/R Al was taken into account, the operative slip system could be predicted correctly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160776
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  • 2
    Electronic Resource
    Electronic Resource
    Deformation behaviour of single crystals of titanium carbide (1979)
    Springer
    Journal of materials science 14 (1979), S. 2151-2156 
    Details
    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 Single crystals of titanium carbide were deformed in compression over a wide range of temperature, and the operative slip systems were determined by etch-pitting and electron microscopy. Around the brittle-ductile transition temperature, the slip system undergoes a gradual change from {1 1 0} 〈1 ¯1 O〉 to {1 1 1} 〈1 ¯1 0〉; this is interpreted to be the mechanism governing the brittle-ductile transition in titanium carbide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688420
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  • 3
    Electronic Resource
    Electronic Resource
    Steady-state creep behaviour of Ti3Al-base intermetallics (1980)
    Springer
    Journal of materials science 15 (1980), S. 2985-2990 
    Details
    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 steady-state creep behaviour of Ti3Al and Ti3Al+10 wt% Nb was studied in the temperature range 550 to 825° C and in the stress range 69 to 312 MN m−2. The temperature and stress dependences of the steady-state creep rates were determined for both intermetallics, and the activation energy and stress-exponent were measured. At temperatures above 700° C, the stress dependence of the steady-state creep rate indicated two distinct creep regimes: at stresses above 138 MN m−2, the creep was controlled most probably by dislocation climb; at stresses below 138 MN m−2, a transition regime with a lower stress-exponent value was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550365
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  • 4
    Electronic Resource
    Electronic Resource
    Flaw growth in a polycrystalline lithium-aluminium-silicate glass ceramic (1982)
    Springer
    Journal of materials science 17 (1982), S. 3129-3139 
    Details
    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 growth of indentation-produced “controlled” flaws in a polycrystalline lithium-aluminium-silicate glass ceramic has been studied, over a wide range of temperatures and strain rates. Significant scatter in the fracture stress at elevated temperatures suggests that the extent of slow crack growth is highly sensitive to microstructural details. The initial flaw shape is important inK IC determination. Up to 1000° C the fracture toughness,K IC, is essentially strain-rate insensitive. The value ofK IC decreases with temperature beyond 850° C. Intergranular cavity formation is suggested as the reason. Crack blunting by diffusive crack healing probably occurs at high temperatures. Also, intergranular slow crack growth occurs essentially under Mode I loading.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01203475
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructures and subcritical crack growth in oxidized hot-pressed Si3N4 (1982)
    Springer
    Journal of materials science 17 (1982), S. 2486-2494 
    Details
    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 the oxide scales, primarily the size, distribution, and density of the pits, was characterized in hot-pressed Si3N4 oxidized at different temperatures from 1300 to 1450
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543879
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  • 6
    Electronic Resource
    Electronic Resource
    Tensile behaviour of two DO3-ordered alloys: Fe3Si and Fe-20 at % Al-5 at % Si (1984)
    Springer
    Journal of materials science 19 (1984), S. 2203-2210 
    Details
    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 tensile behaviour, including fracture modes and deformation substructures, of two powder-produced DO3-ordered alloys having compositions Fe-25 at % Si (Fe3Si) and Fe-20 at % Al-5 at % Si, has been investigated from room temperature to 800° C. The brittle-to-ductile transition temperature for the Fe3Si alloy occurred at a temperature between 500 and 550° C, while that of the Fe-20 at % Al-5 at % Si alloy was approximately room temperature. In both alloys fracture occurred by transgranular cleavage at room temperature, with the occurrence of an increasing proportion of intergranular cavitation with increasing temperature. At low strains plastic deformation occurred chiefly by movement of perfect superlattice dislocations which, with increasing strain, dissociated to produce next-nearest-neighbour antiphase boundary trails.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058096
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  • 7
    Electronic Resource
    Electronic Resource
    Mechanical behaviour of polycrystalline TiC (1983)
    Springer
    Journal of materials science 18 (1983), S. 1983-1992 
    Details
    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 behaviour of hot-pressed TiC was studied. Compacts were fabricated from commercially available TiC powders, which were found to contain impurities including iron, cobalt, silicon and free carbon. Those impurities segregated to the grain boundaries and formed low melting-point phases which degraded the high-temperature strength. Differences in the temperature at which strength began to fall sharply were correlated with differences in the impurity chemistry of the TiC starting powders. It was found that a high-temperature vacuum heat treatment of the as-hot-pressed TiC significantly reduced the levels of impurities at the grain boundaries. This, in turn, caused a dramatic improvement in high-temperature strength. The TiC, so treated, possessed a grain size of approximately 25μm and exhibited a D-B transition in bending at about 1425° C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00554991
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  • 8
    Electronic Resource
    Electronic Resource
    Prediction of fracture-surface energy from microhardness indentation in structural ceramics (1976)
    Springer
    Journal of materials science 11 (1976), S. 973-976 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00542313
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  • 9
    Electronic Resource
    Electronic Resource
    Dynamic KIC and dynamic flexural strength in HS-130 Si3 N4 (1977)
    Springer
    Journal of materials science 12 (1977), S. 212-214 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00738490
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of grain size upon flow and fracture in a precipitation-strengthened Ti-8 wt % Al-0.25 wt % Si alloy (1976)
    Springer
    Journal of materials science 11 (1976), S. 1835-1842 
    Details
    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 interaction of grain size and precipitation strengthening has been studied in a Ti-8 wt % Al-0.25 wt %Si alloy. Grain sizes varying from 9 to 90μm were produced by warm-working and annealing the alloy in the single-α-phase field. A uniform distribution of the coherentα 2 particles in theα matrix was produced by ageing the alloy in the two-phase (α +α 2) field. The yield strength Hall-Petch slopes of the alloys with and without the α2 precipitates were found to be nearly equal, indicating that the precipitation and grain-boundary strengthening are linearly additive. While specimens containing no precipitates exhibited a high ductility for all grain sizes, the ductility of the specimens with theα 2 particles decreased drastically with increasing grain size. TEM examination of the specimens containing the precipitates revealed a highly planar, localized slip and SEM examination of the fracture surfaces of these specimens revealed a transition in fracture behaviour from highly dimpled to mixed cleavage and intergranular with increasing grain size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00708261
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