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  • 1
    Electronic Resource
    Electronic Resource
    The Fatigue Crack Propagation (FCP) Behavior of the Forged Mg-Zn-Y-Zr Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 343-346 
    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: In this paper, the fatigue crack propagation (FCP) behaviors of the forged Mg-Zn-Y-Zralloy with different tempers were investigated. At the stage 1 of the FCP, the [removed info] K-da/dN curves weredistinguished from each other. However, at the stage 2 of the FCP, the [removed info] K-da/dN curves were almostthe same. SEM fracture analysis indicated that at the stage 2 of FCP, the fracture characteristics of theforged and T5 samples were similar, with many deep dimples on the fracture surfaces, whereas thefracture surfaces of the T4 and T6 samples were covered with lots of lamellar cleavage planes. SEMobservations also indicated that the microstructures were distinguished from each other. For theforged and T5 samples, many big bulk w-Mg3Y2Zn3 phases distributed in the Mg matrix. However,for the T4 and T6 samples, due to the solid solution treatment, w-Mg3Y2Zn3 phases were almostcompletely decomposed and many coarse rod-like [removed info] 1[removed info] precipitates appeared in the interior of thegrains. These firmly confirmed that the variation of the microstructures had great influence on thefatigue crack propagation (FCP) characteristics of the Mg-Zn-Y-Zr alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.343.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure Evolution of Mg-Y-Nd-Zr Alloy during High Temperature Deformation (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), 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: The variation of the flow stress and the microstructural evolution during hot deformation at different test temperatures and strain-rates are studied. During hot deformation, dynamical recrystallization did not occur completely; after annealing at 523K, microstructural changes due to static recrystallization and small grain sizes of several micrometers and fine nanometer-precipitates can be attained. The stress exponent (n) and the activation energy (Q) for high temperature deformation have been evaluated and the deformation mechanisms at different temperature have also been discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.269.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Plastic Deformation Behavior of Mg-Li Alloys at Ambient and Elevated Temperatures (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 531-534 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.531.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    A Comparative Study on Superplasticity of Mg-Zn-Y-Zr Processed by ECAE and Hot Rolling (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 203-208 
    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: Superplastic deformation (SPD) behaviors of two fine-grained materials produced byECAE and hot rolling methods have been contrastively studied in this paper. It is found that theoptimum superplastic condition in as-ECAEed material was at 350°C and 1.7×10-3s-1 with elongationto failure about 800%; while in as-rolled material, the largest elongation to failure about 1000% wasobtained at 480°C and 5.02×10-4s-1. Microstructure observation showed that grain evolution andcavitation behavior were different in these two materials during superplastic deformation. Thecontrolled mechanisms for superplasticity, i.e. grain boundary sliding (GBS), dislocation creep anddiffusional creep, at different deformation conditions were discussed in terms of strain rate sensitivitycoefficient, stress exponent and activity energy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.203.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Development of a High Strength Mg-Zn-Y-Zr Wrought Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1701-1706 
    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 effects of Y addition to the Mg-Zn-Y-Zr alloy on the change of the microstructureand the mechanical properties (with the Y content range of 1 to 3 wt%) have been investigated. Itshows that when Zn content is constant (5.65wt%), the alloys with Y content between 1.17 and1.72wt% nearly reach its highest strength. With the composition near the optimums, the extrudedMg-6%Zn-1%Y-Zr alloy shows high strength and excellent ductility. The deformation behavior ofthis new alloy at high temperature has also been studied. Moreover, the super-long fatiguebehavior of the Mg-6%Zn-1%Y-Zr alloy has also been tested, the results show the alloy with ahigh fatigue strength of about 85-90MPa in the super-long fatigue life regime of 1×109 cycles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1701.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Superplastic Behavior of an Extruded Mg-Zn-Y-Zr Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 337-342 
    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: A conventional extrusion has been carried out to induce significant grain refinement inMg-Zn-Y-Zr alloy. The results showed that good superplasticity have obtained in this extruded alloy.The simple and rapid processing route may allow it to be put into successfully practical use inindustry. The effects of temperature and strain rate on superplastic deformation of the extruded alloywere studied. The optimum condition with the elongation of more than 450% was found to be at450°C and 3.3×10-4s-1. Jump tests were carried out at 300-450°C and 8.3×10-5 ~ 1.7×10-2s-1. Theactivation energy for superplastic deformation at 300-450°C is 106kJ/mol and the stress exponent isabout 2.8. The superplasticity observed in this studied condition may be attributed to mechanisms ofdislocation creep mainly within large grains and grain boundary sliding (GBS) of small grains
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.337.pdf
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