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  • Metals and Metallic Materials  (4)
  • Mangrove  (1)
  • 2005-2009  (4)
  • 1990-1994  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Occurrence of methylated tin and dimethyl mercury compounds in a mangrove core from Sepetiba Bay, Brazil (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 6 (1992), S. 221-228 
    Details
    ISSN: 0268-2605
    Keywords: Mangrove ; methylation ; organotins ; dimethylmercury ; anoxic conditions ; methyltins ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Analyses of organotin and organic mercury compounds have been performed in a sediment core from Sepetiba Bay, Brazil, in order to investigate possible methylation pathways in a mangrove environment. The results have revealed that the physico-chemical conditions existing in this type of environment (high organic inputs, anaerobic conditions, microbial activity, etc.) account for high methyltin concentrations (mono-, di- and trimethyltin) in the sediments, which are dependent upon the total load of metal released (e.g. from anthropogenic sources). Furthermore, the presence of dimethylmercury and not monomethylmercury in the samples demonstrated a new pathway of transformation of mercury in the environment: this compound, thought to be unstable in sediment, is assumed to be stabilized by a conjunction of factors, such as high sulphide levels, anoxic conditions and constant inputs of methane into the medium.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590060217
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Microstructure Evolution in Cut Metal Chips of Ti-6Al-4V (2008)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: The microstructural evolution following metal cutting was investigated within metal chips of Ti-6Al-4V. Metal cutting was used to impose a high strain rate on the order of approx.10(exp 5)/s within the primary shear zone as the metal was removed from the workpiece. The initial microstructure of the parent material (PM) was composed of a bi-modal microstructure with coarse prior beta grains and equiaxed primary alpha located at the boundaries. After metal cutting, the microstructure of the metal chips showed coarsening of the equiaxed primary alpha grains and beta lamellar. These metallographic findings suggest that the metal chips experienced high temperatures which remained below the beta transus temperature.
    Keywords: Metals and Metallic Materials
    Type: MSFC-2115 , Materials Science and Technology (MS&T) Conference; Oct 05, 2008 - Oct 09, 2008; Pittsburgh, PA; United States
    Format: text
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  • 3
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    Influence of Processing Parameters on the Flow Path in Friction Stir Welding (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Friction stir welding (FSW) is a solid phase welding process that unites thermal and mechanical aspects to produce a high quality joint. The process variables are rpm, translational weld speed, and downward plunge force. The strain-temperature history of a metal element at each point on the cross-section of the weld is determined by the individual flow path taken by the particular filament of metal flowing around the tool as influenced by the process variables. The resulting properties of the weld are determined by the strain-temperature history. Thus to control FSW properties, improved understanding of the processing parameters on the metal flow path is necessary.
    Keywords: Metals and Metallic Materials
    Format: application/pdf
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  • 4
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    Microstructural Evolution in Friction Stir Welding of Ti-6Al-4V (2008)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: Friction stir welding (FSW) is a thermo-mechanical process that utilizes a nonconsumable rotating pin tool to consolidate a weld joint. In the conventional FSW process, the pin tool is responsible for generating both the heat required to soften the material and the forces necessary to deform and combine the weld seam. As such, the geometry of the pin tool is important to the quality of the weld and the process parameters required to produce the weld. Because the geometry of the pin tool is limitless, a reduced set of pin tools was formed to systematically study their effect on the weldment with respect to mechanical properties and resultant microstructure. In this study 0deg, 15deg, 30deg, 45deg, and 60deg tapered, microwave sintered, tungsten carbide (WC) pin tools were used to FSW Ti-6Al-4V. Transverse sections of the weld were used to test for mechanical properties and to document the microstructure using optical microscopy. X-ray diffraction (XRD) was also used to characterize the microstructure in the welds. FSW results for the 45deg and 60deg pin tools are reported in this paper.
    Keywords: Metals and Metallic Materials
    Type: MSFC-2141 , Materials Science and Technology (MS&T) Conference; Oct 05, 2008 - Oct 09, 2008; Pittsburgh, PA; United States
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  • 5
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    Pin Tool Geometry Effects in Friction Stir Welding (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In friction stir welding (FSW) there is significant evidence that material can take one of two different flow paths when being displaced from its original position in front of the pin tool to its final position in the wake of the weld. The geometry of the pin tool, along with the process parameters, plays an important role in dictating the path that the material takes. Each flow path will impart a different thermomechanical history on the material, consequently altering the material microstructure and subsequent weld properties. The intention of this research is to isolate the effect that different pin tool attributes have on the flow paths imparted on the FSWed material. Based on published weld tool geometries, a variety of weld tools were fabricated and used to join AA2219. Results from the tensile properties and microstructural characterization will be presented.
    Keywords: Metals and Metallic Materials
    Type: M09-0323 , The Minerals, Metals and Materials Society (TMS) Conference; Feb 15, 2009 - Feb 19, 2009; San Francisco, CA; United States
    Format: application/pdf
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