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  • intergranular fatigue cracking  (2)
  • 2,3-dihydro-2-hexyl-5-methylfuran-3-one  (1)
  • 1
    ISSN: 1573-2746
    Keywords: intergranular fatigue cracking ; Σ3 twin boundary ; iron chromium alloy ; bicrystal ; elastic imcompatibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The effect of a geometrical relationship between a grain boundary (GB) plane and a tensile axis on intergranular fatigue cracking along Σ3(1 1 2) twin boundaries has been investigated in Fe-30%Cr alloy crystals. Fatigue experiments were carried out on the three kinds of the specimens containing the Σ3(1 1 2) twin boundary. It was found that the fatigue cracking behavior was sensitive to the geometry of the GB plane. In a specimen where both the GB plane and a slip vector lying in the GB plane in adjacent grains are inclined to the tensile axis at 45°, the fatigue cracks were nucleated preferentially along the twin boundary at a stress amplitude of 170 MPa. The specimen with the GB plane normal to the tensile axis showed that the fatigue crack was initiated from a slip band formed within a constituent grain at a stress amplitude of 300 MPa. When the GB plane was inclined to the tensile axis but the slip vector lying in the GB plane was normal to the tensile axis, development of additional slips formed perpendicular to the GB plane were observed at a specific site of the GB. Initiation of intergranular fatigue cracks at the site was recognized at a stress amplitude of 250 MPa. It can be suggested that the GB plane normal to the tensile axis provides the highest fatigue performance among them. The difference in the cracking property among these specimens could be understood in terms of the effective Schmid factor derived from elastically incompatible stress.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-2746
    Keywords: intergranular fatigue cracking ; twin boundary ; bicrystal ; copper ; persistent slip band
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The criterion for occurrence of intergranular fatigue cracking in copper has been investigated from the view point of both the grain boundary (GB) character and the cyclic deformation property of constituent grains. The copper bicrystals were prepared to have several orientation relationships close to Σ3(1 1 1) coherent twin (Σ3 vicinal domain) so as to change the GB character rapidly with increasing deviation angles |Δθ| from the Σ3 relation. These bicrystals were shaped to single-edge-notched specimens in which a GB plane was perpendicular to the tensile axis. The fatigue crack propagation tests were carried out in air at room temperature. The specimens having deviation angles |Δθ| less than 3° involved no intergranular fatigue cracking. When the |Δθ| values were ranged from 3° to 5°, the ratio of the intergranular cracking increased. In the specimens having the |Δθ| values more than 9°, the intragranular cracking became predominate again. The increase in the intergranular cracking with increasing deviation angle at the |Δθ| values less than 5° could be understood in terms of the increasing GB susceptibility to the GB damage due to air environment. On the other hand, the intragranular cracking at the |Δθ| values more than 9° could be attributed to the formation of the persistent slip bands in the constituent grains and subsequent crack propagation preferentially along them.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0031-9422
    Keywords: 2,3-dihydro-2-hexyl-5-methylfuran-3-one ; 2,3-dihydro-2-octyl-5-methylfuran-3-one. ; A. chinense ; A. fistulosum var. caespitosum ; Allium fistulosum ; Liliaceae ; steam volatile oils ; sulphides
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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