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  • 2005-2009  (13)
  • 1970-1974  (2)
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  • 11
    Electronic Resource
    Electronic Resource
    Effect of the Second Phase on the Microstructure of Magnesium Alloys during Cyclic Extrusion Compression (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 523-527 
    Details
    ISSN: 1662-9752
    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
    Notes: Cyclic extrusion compression (CEC) is an effective severe plastic deformation (SPD)process which can be used for fabricating ultrafine grained light materials such as magnesium alloys.This method introduces three-dimensional compression and shear stresses and the process can berepeated for a certain number of passes until the desired accumulated strain has been introduced. Inorder to reveal the effect of second phases on the microstructure developed in magnesium alloysduring CEC, three different alloys (AZ31, AZ31-1wt.%Si and AZ91) were investigated after CEC 7passes performed at 225°C. The experimental results show that the CEC process can effectivelyrefine the microstructures of these alloys and the mean grain size achieved is 1.3µm, 1.5µm and1.4µm, respectively. It is revealed that the grain size, grain shape and grain boundary structures arelittle affected by coarse phase Mg2Si but strongly affected by the fine phase Mg17Al12. The finephase Mg17Al12 seems to increase the relative grain misorientations, hence enhancing the formationof high angle grain boundaries (HAGBs). It is expected that such changes are improvingmechanical properties, subsequent forming behavior and surface quality
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.523.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    In Vitro Behaviors of Copolymer of Poly (1,4-Phenylene Sulfide-2, 4-Phenylene Sulfide Acid) and Its Nano Hydroxyapatite Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 207-210 
    Details
    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
    Notes: The copolymer of poly (1, 4-phenylene sulfide-2, 4-phenylene sulfide acid)[p-PPS-m-PPSA] and its nano HA composite [NHA/ p-PPS-m-PPSA] were recently developed as a new kind of inorganic-organic system for biomaterials. This kind of copolymer and its nano-HA composites may have a potential use in loaded bone substitutes, fixation or tissue engineering. In the present research the in vitro behavior of this kind of composites has been investigated in the SBF, and the surface changes were measured by XRD, XPS. SEM and EDS. The results showed that the copolymer and the NHA/ p-PPS-m-PPSA composites were very stable in SBF. The Ca, P content increased to 1.64wt% and 0.77wt% on the surface of p-PPS-m-PPSA, and the Ca/P was 1.63, near to that of the stoichiometric HA, 1.67meanwhile the Ca, P content increased on NHA/ p-PPS-m-PPSA surface increased to 8.50wt% and 3.42wt% and the Ca/P ratio of surface of the NHA/ p-PPS-m-PPSA composites decreased slowly from 2.01to 1.83 during the incubation in SBF. Analysis demonstrated that the precipitate on copolymer of p-PPS-m-PPSA was HA and the precipitate on the NHA/ p-PPS-m-PPSA surface was HA, TCP andcarbonated-apatite. All results showed that both the copolymer of p-PPS-m-PPSA and NHA/ p-PPS-m-PPSA composite were stable and bioactive, and might have a promising potential use in implantation and tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.207.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Microstructure Evolution and Mechanical Properties of an AZ61 Mg Alloy through Cyclic Extrusion Compression (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 253-256 
    Details
    ISSN: 1662-9752
    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
    Notes: Microstructure evolution and mechanical properties of an AZ61 Mg alloy processed bycyclic extrusion compression were investigated. It is shown that CEC process may be appliedsuccessfully to AZ61 Mg alloys, and this leads to excellent grain refinement with grain size of ~0.8μmafter 15 passes at 573K and to significant improvements in yield strength, ductility and hardness ofAZ61 materials with slight compressive strength decreases. Dislocations were induced at initial stageof CEC process, and with increased deformation, tangled dislocations developed to form dislocationboundaries and subgrain boundaries, and then evolved into low angle grain boundaries (LAGBs) andhigh angle grain boundaries (HAGBs) which was regarded as continuous dynamic recovery andrecrystallization (CDRR)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.253.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Microstructures and Mechanical Properties of an Al-Cu-Li-Mg-Zr Alloy Containing Zn and Mn (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 995-1002 
    Details
    ISSN: 1662-9752
    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
    Notes: An Al-3.43Cu-1.28Li-0.49Mg-0.12Zr containing 0.62Zn and 0.29Mn was designed andthe microstructures and mechanical properties of the alloy with various heat treatments wereinvestigated. The precipitates of the alloy consist of T1 (Al2CuLi), θ′ (Al2Cu)[removed info]σ (Al5Cu6Mg2) and δ′(Al3Li). As solution temperature is changed from 485°C to 530°C, the solution degree of alloyingelements in alloy increased, the amount of T1 in the alloy aged at 160°C for 18 h increased and that ofθ′ is decreased, resulting in an increase of strength. After solution treatment at 530°C, the alloy agedfor 18 h at 145°C is mainly strengthened by G P zones, and a little amount of T1 precipitates. As agingtemperature is increased to 160°C and 175°C, the strength increased, due to the sufficientprecipitation of σ and T1. The smaller amount of T1 in the alloy aged at 190°C is consistent with itslower strength. Meanwhile, it is found that the σ precipitate does not coarsen as aging temperatureincreases in the range from 160°C to 190°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.995.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Rhodopsin-lipid interactions (1973)
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 1 (1973), S. 355-355 
    Details
    ISSN: 0091-7419
    Keywords: Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Purified, lipid-free rhodopsin has been incorporated into bilayers of natural and synthetic phosphatidyl cholines and a natural digalactosyl diglyceride. Successful incorporation and high regenerability of rhodopsin appears to depend on the nature of the hydrocarbon chains and not specifically on the type of polar head group of the lipids.Electron paramagnetic resonance spectra of recombinant membranes containing small amounts of spin labeled phosphatidyl cholines reveals that rhodopsin interacts directly with the hydrocarbon chains of the phospholipids in the bilayer, resulting in a dramatically decreased motional freedom of the chains.In studies of the recombinant membranes using freeze-fracture electron microscopy, the presence of rhodopsin is detected as discrete particles in the plane of fracture. The particle distribution is dependent on the nature of the lipid hydrocarbon chains and whether or not the rhodopsin has been photolyzed.From these studies, it is concluded that the rhodopsin-bilayer structure is stabilized primarily by direct interaction of the hydrocarbon chains with the protein molecule, and that structural parameters in this model system are subject to modulation by visible light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jss.400010412
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