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  • 1
    Electronic Resource
    Electronic Resource
    Improving the Mechanical Properties of AZ31 Mg Alloy by High Ratio Extrusion (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 503-504 (Jan. 2006), p. 865-870 
    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: Experiments were conducted both to evaluate the potential for grain refinement, the subsequent mechanical properties at room temperature in samples of AZ31 Mg alloy and also to investigate the relationship between one-step and two-step high ratio extrusion (HRE). The one-step HRE was undertaken using a high extrusion ratio of 70:1 at 250, 300 and 350°C. And the two-step HRE was conducted with an extrusion ratio of 7 for the first step at 250, 300 and 350°C, followed by a second-step extrusion with an extrusion ratio of 10 at 250, 300 and 350°C. The initial grain size in the AZ31 ingot was 100μm and that after one-step HRE became similar to 5μm, after two-step HRE at 250, 300 and 350°C were 2, 4, 7μm, respectively, resulting in superior mechanical properties at ambient temperature. The microstructure of two-step HRE was finer and uniformer than that of one-step HRE and the strength of one-step and two-step HRE were similar, moreover, the elongation of one-step HRE was improved markedly than that of two-step HRE. Dynamic recrystallization and adjacent grain broking during HRE is introduced to explain the effects of one-step and two-step HRE on the microstructure and mechanical properties of AZ31 Mg alloy. The current results imply that the simple HRE method might be a feasible processing method for industry applications, and the multiply steps extrusion are effective to fabricate high strength of fine grained hcp metals
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.503-504.865.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of CaCO〈sub〉3〈/sub〉 Modificator on Microstructure and Mechanical Properties of Cast AZ91 Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 155-158 
    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: Effects of CaCO3 modificator on microstructure and mechanical properties of cast AZ91Magnesium alloy have been investigated. Tensile fracture behavior of AZ91 alloys modified byCaCO3 has also been studied. Results show that CaCO3 modificator can obviously refine the grain ofAZ91 magnesium alloy and Mg17Al12. Mg17Al12 in grain boundary of AZ91 alloy after modified byCaCO3 changes from continuous reticular structure to discontinuous reticular structure, even so muchas granular structure and rod structure. After modified by 0.5wt% CaCO3 modificator, ultimate tensilestrength, yield strength, impact toughness and elongation of AZ91 alloy increase from 186MPa to200MPa, from 147MPa to 160MPa, from 4J to 9J and from 2.6% to 5%, respectively. And 0.5wt%CaCO3 modificator brings about an optimal refining effect. The study also shows that the fracturemechanism of modified AZ91 alloy is between cleavage fracture and quasi-cleavage fracture, whichis as same as that of unmodified AZ91 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.546-549.155.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of Cooling Rates on the Dentrite Morphology and Hardness of the Surface-Chilled Mg-10Gd-3Y Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 175-178 
    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: Mg-10wt%Gd-3wt%Y alloy was cast in a step-like mould, which provided five differentcooling rates. The dentrite morphology and hardness of the as-cast alloy from the surface to the centerwas investigated and the influence of the cooling rates on these was analyzed. It was indicated thatthere were two different trends for the hardness distribution: in the section of the step castings withthe two slowest cooling rates, the hardness decreased with the increase of depth; while in the otherthree step castings the hardness increased with the increase of depth. Also it was founded that thehardness could be influenced by the grain boundary, dentrite morphology and dentrite arm spacing(DAS) in the alloy. At last, according to the standard deviation curves of the hardness, the chilleddepths were about 5mm in 1st step and 10mm in 2nd step. And the other steps were fully chilled
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.175.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanical Properties and Creep Behavior of Mg-Gd-Y-Zr Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 163-166 
    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 microstructure, mechanical properties and creep behavior of Mg-Gd-Y-Zr alloys atdifferent temperatures and stresses have been investigated. Results show that the tensile propertiesand creep resistance at T6 condition is much higher than that at as-cast condition. The creepresistance of Mg-Gd-Y-Zr alloy at 250℃/80MPa is markedly better than that at 300℃/50MPa,indicating that temperature makes more effects on the creep resistance than the stress
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.163.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Tensile and Compressive Creep Behavior of Coarse-Grained Mg-Al-Sr Castings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 171-174 
    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: Tensile and compressive creep properties of Mg-5wt.%Al-1wt.%Sr alloy produced bygravity casting were investigated in this paper. Creep tests were carried out in the temperature rangefrom 125 °C to 200 °C and stress range from 35 to 85MPa. The second creep rate in tension issignificant different from that in compression, indicating that coarse-grained Mg-Al-Sr alloy exhibitstension/compression asymmetric behavior. Moreover, the activation energies and stress exponent intension and compression are not the same, which suggest that creep mechanisms in tension andcompression are different
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.171.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Cooling Rate on the Microstructure and Mechanical Properties of ZK60 Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 319-322 
    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 and mechanical properties of Mg-6.0wt%Zn-0.5wt%Zr (ZK60) alloy werestudied as a function of cooling rate. The temperature field and cooling rate during the casting processwere investigated by use of finite element analysis (FEA) simulation. The results showed that themicrostructure was refined and the eutectic phase distributed much uniformly with the increase ofcooling rate. The increase of yield strength, ultimate strength and elongation can be ascribed to thestrengthening effect of fine grain. Relationship between grain size and yield strength is consistentwith the Hall-Petch formalism: 1/ 2 80.37 132.56 − = + d y σ
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.319.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Nd and Y Addition on Microstructure and Mechanical Properties of Extruded Mg-Zn-Zr Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 413-416 
    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 effect of Nd and Y addition on the microstructure and mechanical properties ofas-extruded Mg-Zn-Zr magnesium alloy has been investigated in this study. The Mg-Zn-Zr alloy had11 μm average grain size due to dynamic recrystallization during hot extrusion; but the average grainsizes of the Mg-Zn-Nd-Y-Zr alloys were markedly reduced to 4 μm by Nd and Y additions. Thelamellar α-Mg + T phase or α-Mg + W phase eutectics at grain boundaries in as-cast Mg-Zn-Nd-Y-Zralloys were broken up and MgZn2 precipitates in the matrix are obtained during hot extrusions. Themechanical properties of as-extruded Mg-Zn-Zr alloy were improved significantly by Nd and Yadditions, especially the elevated temperature strength, which was above 150 MPa in ultimate tensilestrength at 250 ºC. These may be ascribed to the very fine grain size, the dispersed T phase or W phaseand the MgZn2 type Laves phase precipitating during hot extrusion
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.413.pdf
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Effects of Er on Microstructure and Mechanical Properties of Mg-Zn-Er-Zr Magnesium Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 105-108 
    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: Microstructure and mechanical properties of Mg-Zn-Er-Zr alloys were characterized indetail. The grain size of as-cast Mg-Zn-Er-Zr alloy was greatly decreased by the Mg-Zn-Er phasesformed at grain boundaries. The addition of Er can increase the yield strength (YS) but decrease theultimate tensile strength (UTS) and elongation of as-cast Mg-Zn-Zr alloy. The thermally stableMg-Zn-Er phases were just partially dissolved into the matrix during solution treatment. And theaddition of Er can prolong the precipitation process of Mg-Zn-Zr alloy. Solution-plus-ageingtreatment can increase the strength of both the Mg-Zn-Zr and Mg-Zn-Er-Zr alloys, but thestrengthening effect of Mg-Zn-Er-Zr alloy was greatly weakened, for the incompletely solution ofMg-Zn-Er phases. Er can greatly enhance the high temperature elongation of Mg-Zn-Zr alloy, but theincrease of high temperature tensile strength was just a little
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.105.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of Rolling Temperature on Microstructure and Tensile Properties of AZ31 Sheets (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 311-314 
    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 and tensile properties of AZ31 rolled at different temperatures werecharacterized. Rolling of extruded AZ31 plates was carried out at room temperature, 573K, 623K and673K. Cold rolling of extruded AZ31 plates was difficult due to the poor formability at roomtemperature. And deformation twinning plays an important role in rolling of AZ31 alloy at roomtemperature. The microstructural analysis showed that the nucleation of dynamic recrystallization(DRX) occurred at 573K, DRX was almost completed at 623K and grain growth was determined at673K. The ultimate tensile strength (UTS) as large as 377MPa was achieved after rolled at 573K. Andthe anisotropy in strength was obviously examined due to the rolling texture. The anisotropy reducedas rolling temperature increasing from 573K to 673K and this may be attributed to the completion ofDRX
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.311.pdf
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