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  • 1
    Electronic Resource
    Electronic Resource
    The effect of microstructure on the morphology of fatigue cracks in UDIMET® 720 (2000)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 23 (2000), S. 0 
    Details
    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: The low cycle fatigue (LCF) behaviour of four variants of UDIMET® 720 was investigated. The materials comprised a fine grained (approximately 10 μm), powder processed material with a fine bimodal distribution (∼20 and 80 nm) of secondary γ′; the same material, but with enlarged secondary γ′ (∼480 nm); a coarse grained powder processed material (grain size ∼62 μm) and finally a cast and wrought material with a similar microstructural scale to the fine grained powder processed alloy, but with reduced interstitial element content. LCF testing was undertaken on corner notched square section specimens at 20, 300 and 600 °C with a frequency of 0.25 Hz, a cyclic stress range of 500 MPa and an R ratio of +0.1. At 20 and 600 °C fracture was found to be macroscopically flat for all materials. However, at 300 °C, significant shear fracture was observed in the two materials that had a fine grain size and a fine secondary γ′ size, leading to a characteristic ‘tear-drop’ appearance. Only minor shear fracture was observed in the coarse grained and enlarged secondary γ′ materials. Tensile tests indicated that weak dynamic strain ageing occurred in all materials at 300 °C. The fine grained powder processed U720 also exhibited dynamic strain ageing at 600 °C, but this was not the case for the coarse grained or cast and wrought materials. The origin of the shear fracture are discussed and related to the microstructure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.2000.00339.x
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  • 2
    Electronic Resource
    Electronic Resource
    Fatigue damage mechanisms associated with ‘tear-drop’ cracking in UDIMET 720® (1999)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 22 (1999), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.1999.00207.x
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  • 3
    Electronic Resource
    Electronic Resource
    Dissolution of Silicate Rocks (1960)
    [s.l.] : Nature Publishing Group
    Nature 185 (1960), S. 837-838 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The classical treatment of rocks involves dissolving the sample in a sulphuric/hydrofluoric acid mixture or a perchloric/hydrofluoric acid medium, the sample being contained in a platinum dish. There are several disadvantages inherent in the use of platinum ware for these operations, in particular ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/185837b0
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  • 4
    Electronic Resource
    Electronic Resource
    Apparent Geochemical Association of Bismuth and Thallium (1961)
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 910-911 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Until recently, very few data have been available for the abundance of bismuth in silicates due to the lack of analytical methods sufficiently sensitive for its determination at its low concentration levels in such rocks. However, a new method has been developed2"4 in which this element has been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/189910b0
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  • 5
    Electronic Resource
    Electronic Resource
    The chemical form and physiological function of nickel in some Iberian Alyssum species (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 51 (1981), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The form of nickel in leaves of Iberian subspecies of Alyssum serpyllifolium Desv. was investigated. Subsp. lusitanicum T. R. Dudley and P. Silva (from N.E. Portugal) and subsp. malacitanum Rivas Goday (from Southern Spain) were hyperaccumulators of nickel (〉1000 μg/g Ni) whereas their non-accumulating precursor (subsp. serpyllifolium) was not. Nickel existed mainly as a water-soluble polar complex in the vacuoles. Small concentrations of nickel did however exist in cell fractions, particularly in the mitochondria where enzyme systems are located. Gas-liquid chromatography on the purified nickel complexes showed that this element is associated principally with malic and malonic acids which are present in high concentrations in the hyperaccumulators but not in subsp. serpyllifolium. It is suggested that production of malic acid is a mechanism whereby hyperaccumulators can tolerate unfavourable edaphic factors such as nickel-rich soils. Presence of nickel in the mitochondria can presumably block the citric acid cycle by deactivating malic dehydrogenase leading to build-up of malic acid in the vacuoles which could then absorb excess nickel by a complexing reaction and lead to its diffusion back into the vacuoles from the mitochondria, hence unblocking the citric acid cycle. It is postulated that the chemical evidence suggests that the two hyperaccumulators are not conspecific and that subsp. malacitanum should be promoted to full specific rank.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1981.tb02693.x
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  • 6
    Electronic Resource
    Electronic Resource
    Chromium-51 distribution in tissues and extracts of Leptospermum scoparium (1969)
    Springer
    Planta 88 (1969), S. 282-287 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Leptospermum scoparium plants cultured in solutions containing Na2 51CrO4 accumulated most of the absorbed radioactivity in the roots. About one third of the root radioactivity was soluble in 80% ethanol in the form of three 51Cr-complexes, the predominant one being identified as trioxalatochromate (III) ion. These complexes were also present in stem and leaf extracts. 51Cr distribution was examined in various chemical fractions; protein and nucleic acids were especially low in radioactivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385071
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  • 7
    Electronic Resource
    Electronic Resource
    A nickel-accumulating plant from Western Australia (1972)
    Springer
    Planta 103 (1972), S. 91-94 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A small shrub Hybanthus floribundus (Lindl.) F. Muell. Violaceae growing in Western Australia accumulates nickel and cobalt to a very high degree. Values of up to 23% nickel in leaf ash may represent the highest relative accumulation of a metal on record. The high accumulation of nickel poses interesting problems in plant physiology and plant biochemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394610
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of Molecular Structure on the Liquid/Liquid Extraction of the Chloro-Complexes of Gallium and Indium with Aliphatic Ethers (1961)
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 375-376 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE determination of elements of low abundance in geological materials is of considerable interest in geochemistry, and very sensitive methods have been developed in recent years for the estimation of these trace elements. Such techniques include neutron activation1 and recent work on the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/189375a0
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  • 9
    Electronic Resource
    Electronic Resource
    Trace Element Content of Antarctic Lakes (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 167-168 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Neglecting a sea water origin for the lakes, the salts present could have come from three possible sources: (1) Atmospheri recipitation. It is well known that rain water at considerable distances from the sea contains appreciable quantities of several inorganic ions9 and it is possible that the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/213167a0
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  • 10
    Electronic Resource
    Electronic Resource
    Elemental levels and relationships in the Flacourtiaceae of New Caledonia and their significance for the evaluation of the ‘serpentine problem’ (1985)
    Springer
    Plant and soil 87 (1985), S. 281-291 
    Details
    ISSN: 1573-5036
    Keywords: Casearia ; Flacourtiaceae ; Homalium ; Lasiochlamys ; Reduced nutrient uptake ; Serpentine plants ; Xylosma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Sixteen elements were determined in 156 specimens of 47 species of New Caledonian Flacourtiaceae including the genera Casearia, Homalium, Lasiochlamys and Xylosma. The data were used to study inter-elemental relationships, particularly those involving nutrient elements, magnesium and phytotoxic elements such as chromium, cobalt and nickel. Phytotoxic chromium was not accumulated to any marked degree by any taxon. Cobalt was inversely correlated with boron and sodium, and nickel with both nutrients as well as manganese. The data seemed to indicate the overriding controlling factor of reduced nutrient uptake caused by elements present in high concentrations in serpentinic substrates. It would seem that this reduced uptake is a major factor in the ‘serpentine problem’, at least as far as the Flacourtiaceae and the New Caledonian environment is concerned. By contrast, the toxic effects of elements such as nickel, cobalt and chromium seems less important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181867
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