Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Hydrogen-Induced Phase Transformations in Mg-Ni Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 138 (Mar. 2008), p. 63-70 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Hydrogen is suggested as a promising fuel of the near future for the utilization inautomotive and mobile applications. Therefore, safe and effective hydrogen storage systems need tobe developed. One of the possibilities, suitable especially for mobile applications, is the storage ofhydrogen in the form of light-metal hydrides. In this work we studied microstructure and hydrogenabsorption and desorption kinetics in selected Mg-Ni alloys. Hydrogen saturation was carried out bythe cathodic polarization in alkaline water-based solution. It was confirmed that hydrogen could bestored in the Mg2Ni intermetallic phase forming Mg2NiH0.3 phase using this technology. MgH2hydride is also formed when the temperature of 90 °C is applied. The total content of hydrogen inthe material after saturation is approx. 0.7 wt. % according to the thermogravimetry analysis. Thislow value is caused probably by the surface oxidation, blocking further hydrogen diffusion. Thermalhydrogen desorption tests showed that the Mg2NiH0.3 phase is able to release hydrogen even attemperatures lower than 100 °C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.138.63.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Structural Evolution of Al-Cr Alloy during Processing (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 138 (Mar. 2008), p. 145-152 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Aluminium-chromium based alloys are promising candidates for manufacture of lightcomponents exposed to elevated temperatures. The work describes properties of Al-6.0wt.%Cr-2.1wt.%Fe-0.5wt.%Ti alloy. The rapidly solidified powder was prepared by the pressure nitrogenmelt atomization. The powder was then subject to heat treatment in order to investigate solid statephase transformations. Compaction of the powder was carried out by hot extrusion after preheatingat 450 °C. Microstructure, phase composition and structural transformations on heat treatment wereinvestigated in the as-atomized powder, as well as in the as-extruded alloy. It is found thatmetastable state of the rapidly solidified powder is characterized by presence of quasi-crystallinephases and supersaturated solid solution. Heating before and during the hot extrusion inducesdecomposition of the supersaturated solid solution and quasicrystalline to crystalline phasetransformations. The hot extruded alloy has a refined recrystallized structure that remains verystable aven after long-term annealing at 400 °C. Mechanical properties of the extruded alloy arediscussed in terms of strengthening mechanisms
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.138.145.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Acoustic Emission Testing of High-Pressure Composite Cylinders (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 13-14 (Feb. 2006), p. 267-272 
    Details
    ISSN: 1662-8985
    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: AE studies were performed considering pressure cylinders of design1 Type II – metallicliner with hoop composite wrapping, Type III – metallic load sharing liner with full compositewrapping and Type IV – all-composite cylinder. The AE technique has to be improved so far thatfor different design types of cylinders standard AE equipment can be used in an easy andpracticable way under normal conditions of production and service. The paper presents our 8 yearsof experience in this application area using conventional AE measuring technique. Potentials,requirements and limits for detection of manufacturing faults and in-service damages of highpressurecomposite cylinders are discussed.1Cylinder types classification in accordance with ECE R 110 / ISO 11439
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.13-14.267.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Structure and Properties of Magnesium-Based Hydrogen Storage Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 217-220 
    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: Hydrogen is the promising pollutant-free fuel of the near future. For various hydrogenapplications, suitable storage systems have to be developed. One of the safe ways is the reversiblestorage of hydrogen in the form of light metal (lithium or magnesium) hydrides. MgH2 magnesiumhydride shows very high storage capacity (approx. 7 wt. %), but its problem is high thermodynamicstability. Therefore, high temperature (over 400°C) is necessary for MgH2 to decompose producinghydrogen. The solution of this problem can be the utilization of the complex magnesium hydridescontaining nickel, copper or other transition metals.In this work, the microstructure and hydrogen storage properties of the various magnesium alloys(Mg-Ni, Mg-Zn, Mg-Cu and Mg-Cu-Al) are described. The aim was to find suitable hydrogenstorage system with good storage capacity and sufficient rate of formation and decomposition ofhydrides. Microstructure, chemical and phase composition of the alloys were determined by thelight and scanning electron microscopy, EDS and XRD. Hydrogen saturation was carried out bycathodic polarization in the alkaline solution. Hydrogen content in the material was estimated byXRD from the shift of the diffraction lines of present phases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.217.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Superposition model analysis of the magnetocrystalline anisotropy of Ba-ferrite (1994)
    Springer
    Czechoslovak journal of physics 44 (1994), S. 603-611 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theoretical analysis of the first magnetocrystalline anisotropy constantK 1 of BaFe12O19 is performed. Two contributions toK 1 are considered — single ion anisotropy and dipolar anisotropy. ParameterD which determines the magnitude of the single ion contribution is calculated on the basis of the superposition model. It is argued that the disagreement between calculated and observed values ofK 1 is most likely connected with the contribution of Fe3+ ions on bipyramidal sites, for which the value ofD is uncertain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01689608
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Stereophotographic study of impact on beams and frames (1976)
    Springer
    Experimental mechanics 16 (1976), S. 66-70 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The method of double photogrammetry is commonly used for dynamic measurements. This paper describes the use of stereophotogrammetry for the study of impact on frames and beams. For this investigation, a special stereocamera must be equipped with another device. The time of exposure is controlled electronically. When measuring the impact effects on frames and beams, it is possible to obtain an instantaneous form of vibration. As the measurement is carried out to a large number of points, it is impossible to express these modes analytically and to obtain a more general solution for various types of beams. Practical solutions are presented for a simple beam, a fixed-end beam and a spatial frame.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328606
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...