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  • 1
    Electronic Resource
    Electronic Resource
    Semisolid Microstructural Evolution of Equal Channel Angular Extruded Mg-Al Alloy During Partial Remelting (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 557-562 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Using equal channel angular extrusion (ECAE) process, which combine the advantages ofgrain refinement and induced strain, for preparing semisolid billets is a relatively new Strain InducedMelt Activation(SIMA)method. This paper investigates the remelting and semisolid isothermalholding behavior of Mg-9Al alloy after ECAE processing at 350ºC. It has been found that 2 passesECAE-ed billets are qualified for obtaining spherical grains after remelting and isothermal holdingtreatment. Increasing the ECAE process from 2 passes to 8 passes has no further significant effects onthe size and roundness of the solid particles at the semisolid state. The effects of temperature andisothermal holding time on microstructural evolution have also been investigated. In addition, thesolid solution treatment before the ECAE processing affected greatly on microstructural evolution ofthe alloy during ECAE processing and thus the following remelting and isothermal holding behavior.The Mg17Al12 precipitates were uniformly decomposed from the saturated solid solution in thesolutionized samples during ECAE processing. The coalescence of grains together with theself-blocking effect generated more entrapped liquid in the solutionized sample at semisolid state.Moreover, the solid particles of solutionized samples have bigger size and grow faster, which aredetrimental to SSM processability
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.557.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of Mushy Zone of ZWx2 (x=2, 4, 6) Magnesium Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 581-585 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The potentials of Mg-Al system alloys for semi-solid forming have been extensivelyevaluated these years. In the present studies, mushy zone properties of the Mg-Zn system alloys, i.e.ZWx2 (x=2, 4, 6), are characterized and analyzed by using cooling curve thermal analysis method andcontinuous torque measurement technique. The results show that Tn1 (first characteristic temperatureof primary crystal nucleation), Tn2 (second characteristic temperature of primary crystal nucleation)and Tch (temperature of dendritic coherency) decrease with the increasing of zinc content, and thetemperature difference of (Tn1-Tn2) almost remains constant, while the temperature difference of(Tn2-Tch) changes dramatically when Zn content increases to 6wt.%; The results also show that the fs-cc(solid fraction of dendritic coherency) of ZWx2 alloys ranges from 0.4 to 0.51 while ZW22 andZW62 alloys having higher fs-ch and ZW42 alloy having the lowest fs-ch; also, strength of alloys inmushy zone does not develop until a certain fraction solid( corresponding to the dendrite coherencypoint) is reached. The results obtained by cooling curve thermal analysis method and continuoustorque measurement techniques are comparable to each other
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.581.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Structural Evolution and Deformation Behavior of Extruded AZ91 with Ca Addition in the Semi-Solid State (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 775-778 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The microstructural evolution and mechanical response in compression in the semi-solidstate of previously extruded AZ91 alloys containing two levels of Ca additions (1mass%Ca (AZC911)and 2mass%Ca (AZC912)) have been studied. Ca additions have a significant effect onmicrostructural evolution and compression behavior of the AZ91 alloy. At 515°C, the liquid fractionin AZC911 is larger than that in AZC912, so that the compression stress of the AZC912 alloy wasfound to be much larger than that of the AZC911 alloy. This behavior is explained through DSCanalysis which suggests that some solid Al2Ca phase remains in AZC912 alloy at this temperature.Increasing the remelting temperature for this alloy leads to more liquid and coarsening of the solidparticles occurs with increasing holding time
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.775.pdf
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Development of a High Strength and High Ductility Magnesium Alloy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 265-268 
    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 new steel mold gravity casting magnesium alloy of low-cost, high strength, and highductility has been developed and studied. This new magnesium alloy, which is designated as IMR-41, exhibits high strength (Yield Tensile Strength≈145 MPa, Ultimate Tensile Strength≈280 MPa) and high ductility (Elongation≈8%) at room temperature. The alloying elements are inexpensive ones and the cost of IMR-41 is similar to AZ91 series. The influence of small X element addition and heat treatment on the microstructures and mechanical properties are discussed. The IMR-41 combines the virtues of AZ91 series and AM60 series to some extend and shows great potential application on wheels of lightweight vehicles or motorcycles, etc. which require high strength and high ductility simultaneously
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.265.pdf
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of Extruded Mg-Al-Ca Based Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 275-278 
    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: Mechanical properties and microstructure of extruded AZ91(-Ca) alloys have been studied in this paper. The results showed that Ca has no significant effect on reducing grain size of the extruded AZ91 alloy. The ambient temperature tensile tests showed that the ultimate and yield strength of extruded AZ91 alloy decreased by addition of Ca. At elevated temperature, Ca addition improves the yield strength of both AZ91 alloy. The variations in microstructure and mechanical properties of the AZ91 alloy are also discussed in terms of the effects of Ca on grain refinement andformation of constituent phases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.275.pdf
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Comparison of Coating Properties by Two Pulse Modes on Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 585-588 
    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: Micro arc oxidation is an effective method to improve corrosion resistance of magnesiumalloys and the selected electric parameters have great effects on coating properties. In this paper, theeffects of the unipolar pulse and the bipolar pulse on surface morphology, chemical compositions andcorrosion resistance were studied. When working voltage was higher than breakdown voltage, sparksappeared on sample surface whether the unipolar pulse or the bipolar pulse was used. However, underthe same positive working voltage, the spark size and lifetime obtained by the bipolar pulse wereevidently larger and longer than those by the unipolar pulse, which resulted in rougher anodic coatingsand worse corrosion resistance by the former than the latter
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.585.pdf
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  • 10
    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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