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  • 1
    Electronic Resource
    Electronic Resource
    Study on Cavity Growth in Uniaxial Tension of ZK60 Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 687-690 
    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: Cavity growth is a typical microstructure feature in superplastic forming (SPF) ofmaterials. Substantial growth and interlink of cavities in superplastic deformation usually lead toreduction in elongation, even to failure. Consequently, it is necessary to investigate themechanism and model of cavity growth. In this paper, experimental studies on cavity growth werecarried out by means of superplastic tension of ZK60 magnesium alloys. Scanning electronicmicroscope (SEM) was employed for observation of fractography. Experimental cavity radius andvolume fraction were determined by optical microscopy and corresponding picture-based analysissoftware. It is found that, the fractured surfaces after a superplastic elongation have a mixedcharacteristic of intergranular cavities and dimples. Further, the cavity growth is identified to followa exponentially increasing mode
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.687.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Diffusion Bonding in Superplastic ZK60 Magnesium Alloy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 227-230 
    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, diffusion bonding of ZK60 superplastic material is investigated according to atom diffusion law. Gleeble-1500 testing machine is used in the diffusion bonding processing on the superplastic ZK60. In additional, shear tests of bonding joints are carried out on electronic universal testing machine. The optimized diffusion bonding conditions are obtained: a bonding time of 90 min at 653K at a pressure of 20MPa. The microstructures of the joints are observed through OM and SEM. It is concluded that the mechanism of diffusion bonding of the ZK60 superplastic material is the slide of original grain boundaries caused by atom diffusion and the grain growth, and sound joints with high shear strength are obtained through sufficient diffusion of the interface atoms
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.227.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Superplasticity and Superplastic Formability of Hot-Rolled AZ31 Magnesium Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 231-235 
    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 superplasticity of a hot-rolled AZ31 Mg alloy was investigated by uniaxial tensile testsat temperature range 250-450oC and strain rate range 0.7×10-3-1.4×10-1s-1. Superplastic formability ofthe alloy was evaluated by gas bulging test at elevated temperatures. The threshold stress for grainboundary sliding (GBS) was calculated and the topography during superplastic deformation wasobserved by SEM. It is found that, at 400 oC and 0.7×10-3 s-1, the maximum elongation reaches362.5%. GBS is the predominant deformation mechanism and characterized by a pronouncedimprovement in homogeneity with increasing temperatures, indicating a transformation of GBS modefrom cooperative GBS (CGBS) to individual GBS (IGBS). The improved homogeneity of GBS canbe interpreted in terms of decreased threshold stress with increasing temperatures. Gas bulging testdemonstrates that the temperature for the best superplastic formability is 400 oC and a hemisphericalpart with a specific limiting dome height of 0.51 was obtained, suggesting good application prospectfor this 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.551-552.231.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Magnesium Alloy AZ31B Sheets with Thermal Deep-Drawing Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 289-292 
    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 finite element numerical simulation for the formability of magnesium alloy AZ31Bsheets with thickness of 0.8mm and diameter of 140mm has been proceeded to investigate theformability using the current finite element software. Under the condition with blank holder force of8KN and deep drawing speed of 0.3mm/s at 200[removed info], the sytematic analysis and prediction of thethickness change and the forming rule for thesimulation process of the blank has been carried out.Under the same parameter, the drawing parts by deep drawing with a hydaulic machine were obtainedand the thickness tested. It has been found that thickness change rules and the forming rules of theexperimental results were in agreement with the numerical simulations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.289.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of Diffusion Bonding for Superplasticity Magnesium Alloys with the Fore and Post Treatment (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 169-172 
    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: Influence of surface treatment to diffusion bonding before joining was analyzed during theprocess of magnesium alloys diffusion bonding. We processed diffusion bonding by using ZK60rolling superplasticity magnesium alloy sheets with thickness 1.5mm and grain size 8.9$m. Joint wascarried out ageing strengthening by experiment study to increase its shearing strength. Ageingstrengthening performance was researched under ageing temperature 150-190 °C and the ageing time6-48h. The results showed: diffusion bonding joints’ shearing strength had enhanced in some degreesand reached 86% of basal strength when the ageing temperature is 160 °C and the ageing time is 24h.It showed that the magnesium alloy joint’s strength could be greatly improved by ageingstrengthening
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.169.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    SPF/DB Research in ZK60 Alloy with Gasification Agent as Pressurization Mediator (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 241-244 
    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 SPF/DB technology using gasification agent as pressurization mediator wasproposed in this paper. The forming principle of SPF/DB using the agent was represented. Dies usedfor the forming process was designed and manufactured, and new gasification agent N11 which iswhite solid powder at normal temperature and it is easy to encapsulate and keep was developed formagnesium alloy. ZK60 magnesium alloy with a thickness of 1mm and grain size of 7.9μm wasselected to conduct the experiment of SPF/DB. Corrugated ZK60 magnesium alloy parts were wellformed under the temperature between 653K and 673K and forming time of 50 minutes. SEM wasused to observe the microstructures of the diffusion bonding joints. The result shows that the jointswere well bonded
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.241.pdf
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