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  • 2005-2009  (10)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Stress Relaxation in Selected Magnesium Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1613-1616 
    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 stress relaxation phenomena in magnesium alloys, containing Al, Sr and Ca soluteshave been investigated. The samples were deformed at a constant initial strain rate at varioustemperatures between room temperature and 300 ºC. Stress relaxation, i.e. a decrease in the stresswith time, was measured at various stresses and at various temperatures. The stress relaxation curveswere analysed as a function of the internal stress at the beginning of the relaxation and the testtemperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1613.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanical Properties of AS21 Magnesium Alloy Based Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 482 (Apr. 2005), p. 363-366 
    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: The high temperature behaviour of composites with the AS21 magnesium alloy matrix, reinforced by short Saffil fibres was investigated in the temperature interval from room temperature to 300 °C. The yield stress and the maximum stress decrease with increasing temperature. Two types of specimens were investigated – one with fibres plane oriented parallel to the stress axis and the other with perpendicular fibres plane orientation. Light and scanning electron microscopy wereused for study of the microstructure of composites. Possible hardening and softening mechanisms are discussed. The shear stress at fibre/matrix interface was of greatest importance in this regard, though the contribution resulting from the dislocation density increase was also significant
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.482.363.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructural Characterization by Nondestructive Methods (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 482 (Apr. 2005), p. 103-108 
    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: Nondestructive methods may help to detect changes in the internal structure of a material and to explain the behaviour of the material. This paper describes a series of nondestructive tests performed on magnesium composites with a variety of matrices: commercial pure Mg and three magnesium alloys AZ91, ZC63 and ZE41. Short fibres of δ-Al2O3 (Saffil®) were used as the reinforcement. Internal friction measurements and joint dilatation and acoustic emission studies were used to demonstrate how thermal cycling influences the deformation behaviour of Mg basedmetal matrix composites. The values of the logarithmic decrement are influenced by the upper temperature of the cycle. The acoustic emission activity and the residual strain increase with increasing upper temperature. The results may be explained assuming that internal thermal stresses are generated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.482.103.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of Temperature on Fracture Mechanisms of Magnesium Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 482 (Apr. 2005), p. 375-378 
    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: Magnesium alloy AZ91 (9 % Al, 1 % Zn, 0.2 % Mn in wt.%) with differentreinforcements has been used to study fracture mechanisms and crack development. SiC particles and /or Saffil fibres were used as the reinforcement. Fracture surfaces of specimens prepared by impact tests in the temperature range from room temperature to 300 °C were investigated by scanning electron microscope (SEM). Possible mechanisms of fracture are discussed in the relationto the test temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.482.375.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Plastic Properties of Microcrystalline Mg with Ceramic Nanoparticles (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 189-192 
    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: The Mg micropowder was mixed and ball milled with ceramic nanoparticles. Thematerial was compacted and then hot extruded. Samples have been deformed in tensile as well ascompression tests at temperatures between 20 and 300 ºC at a constant initial strain rate. The flowstress is significantly influenced by temperature. The yield stress and maximum stress decrease withincreasing temperature. Stress strain curves obtained at lower temperatures in tensile testssubstantially differ from ones estimated in compression. Stress relaxation tests were conducted inorder to find the internal stress as well as to identify possible thermally activated process(-es)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.189.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Deformation Behaviour of an AX41 Magnesium Alloy at Elevated Temperatures (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 321-324 
    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: The deformation behaviour of the ternary magnesium alloy AX41 (4%Al-1%Ca-balance Mg) wereinvestigated in uniaxial tension tests at temperatures between 20 and 300 °C and at an initial strainrate ranging in the order 10-4 s-1. The yield stress of the alloy is very sensitive to the testingtemperature. Stress relaxation tests were performed with the aim to reveal physical base ofdeformation processes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.321.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and Properties of Gradient Layers Using High Power Diode Laser (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 269-274 
    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: Investigations include alloying the X38CrMoV5-3 hot-work tool steel surfacelayer with the tungsten carbide, using the high power diode laser (HPDL). The tungstencarbide ceramic particles of the medium grain size according to FSSS = 50 Bm wereintroduced using the rotor conveyer to improve the properties of the surface layer. Thepowder feed rate was set at the steady level of 8.64g/min. Remelting and alloying werecarried out several times in the laser power range of 1.2 – 2.3 kW in the remelting/alloying,alloying/remelting sequences. The structural mechanism was determined of gradient layerdevelopment, effect was studied of alloying parameters, gas protection method, and powderfeed rate on its mechanical properties, and especially on its hardness, abrasive wearresistance, and roughness. Structure changes were revealed consisting, in particular, in itsrefining, and also hardness and microhardness changes in comparison to the non-remeltedsteel. Examination results obtained with the EDX microanalysis, surface and linear analysesof the chemical composition, as well as the X-ray qualitative phase analysis are presented
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.269.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    The Effect of Grain Size on the Deformation Behaviour of Selected Mg Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 85-88 
    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: The mechanical properties and deformation behaviour of magnesium alloys aresignificantly influenced by the testing temperature, texture and grain size. The paper gives anoverview on the influence of the grain size on the mechanical properties of Mg and Mg-2Al alloysat various temperatures. The yield stress and the fracture stress increase with decreasing grain size.It was shown that the elongation to fracture increases with inverse square root of grain size. Theeffect of grain size on the tensile strength and the elongation to fracture is influenced by the testingtemperature. The observed grain size dependence of the elongation to fracture is explained by theactivity of non-basal slip systems
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.85.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Superplasticity of an AZ91 Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 365-368 
    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: The superplastic deformation characteristics of the AZ91, the mostly used magnesiumalloy, were investigated at various strain rates in the interval from 3x10-5 to 1x10-2 s-1 andtemperature of 420 °C. To prepare superplastic alloys thermo-mechanical treatment was used. Castmaterials were heat-treated in two stages, after homogenization at 415 °C for 10 h were submitted tothe precipitation annealing at temperature in the range of 200-380 °C for 10 h, and deformed by hotextrusion. Microstructure of samples was observed by the light microscope Olympus. Strain ratesensitivity parameter m has been estimated by the abrupt strain rate changes method. The strongstrain rate dependence of the m-parameter was found. The highest elongation to failure, 584%, wasfound for the samples aged at 380 °C. Possible physical mechanisms of the superplastic flow arediscussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.567-568.365.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Anelastic Properties of Mg+3vol.%Gr Prepared by Ball Milling (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 319 (Sept. 2006), p. 189-196 
    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: Internal friction in ultra-fine grained Mg with 3vol% of Graphite was measured by forcedvibration method at low frequencies of 0.1, 0.5, 1.0, and 2.0 Hz over a temperature range from roomtemperature to 753 K with continuous heating. The specimens were prepared by milling procedurein an inert atmosphere and subsequent compacted and hot extruded. Two developed peaks in theinternal friction spectrum were obtained at temperatures ≈ 350 K and ≈ 550 K. While the position ofthe first peak is frequency dependent, the second peak position is stable, independent of measuringfrequency. The activation energy of the low temperature peak was estimated. In the light of internalfriction measurements, the high temperature internal friction peak is attributed to the generation andmotion of dislocations produced by the difference in the coefficient of thermal expansion betweenthe Mg matrix and Gr phase at the matrix–particle interfaces
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.319.189.pdf
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