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  • 1
    Electronic Resource
    Electronic Resource
    Influence of Thixoextrusion Parameters on Mechanical Properties of Thixoextruded 7075 Al Wrought Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1361-1364 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The main emphasis of this study is to utilize thixoextrusion process for improvingextrudability of 7075 Al wrought alloy. In the present study, the influences of thixoextrusionparameters, such as initial ram speed and die bearing length, on mechanical properties ofthixoextruded 7075 Al wrought alloy were investigated. The results of thixoextrusion experimentsabout microstructures and mechanical properties were compared with conventional extrusion results.The maximum extrusion pressure of thixoextrusion processes was seven times lower than that ofconventional hot extrusion processes. The hot extruded bars show a large amount of grains which arestretched along the extrusion direction and asymmetry of grains was formed to extrusion direction,while the microstructures of the thixoextruded bar did not show any asymmetry and grains werehomogeneously distributed. The hardness values of thixoextruded bar were higher than that ofconventional hot extruded bar
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1361.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Development of Environment-Friendly CaO Added AZ31 Mg Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1481-1484 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Molten Mg alloys burn rapidly in air if not protected. In order to handle molten Mg safely,the molten metal should be protected from oxidation by covering the surface with flux or protectivegases. Sulfur hexafluoride (SF6) gas is widely used for Mg alloy as a cover gas and has proved to be asuccessful inhibitor. However, the use of SF6 gas is limited because of its high cost and its significantimpact on global warming potential (GWP). Therefore, SF6 gas is being replaced by alternativeprotection gases such as tetrafluoro ethane (HFC-134a) and 3M NovecTM 612. These gases are lessexpensive and have lower GWP, compared with SF6 gas. Recent studies show that there has beenanother attempt by adding CaO into Mg alloys to manufacture CaO added AZ31Mg alloy in terms ofincreasing ignition temperature and reducing protective cover gas amount during melting and casting.This paper discusses effect of CaO on ignition and oxidation behaviors of AZ31 Mg alloy as well ason surface roughness and mechanical properties of AZ31 Mg alloy extruded bars
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1481.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Development of In-Mold Rheocasting Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 181-184 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Novel In-mold rheocasting, which can satisfy all the development direction of rheocasting,has been successfully developed. In-mold rheocasting requires no additional processing equipmentexcept diecasting machine, no grain refinement procedure and no additional cycling time to produceslurry-on-demand. Process concept of In-mold rheocasting is simply based on the paradigm shift fromHOW to WHERE for producing slurry-on-demand and the shift from obtaining PERFECT solidglobules to casting OPTIMUM products. Optimum external field can be generated in mold, that is, indie cavity exactly around biscuit. This paper will demonstrate the possibility to achieveslurry-on-demand by In-mold rheocasting and some commercial products
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.181.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Development of Novel Hot Chamber Rheo-Diecasting Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 191-194 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Novel hot chamber rheo-diecasting process has been successfully developed. It requires noadditional processing equipment except commonly used hot chamber diecasting machine, no moltenmetal control like grain refinement procedure and no additional cycling time to produceslurry-on-demand. Additionally, it could lower molten metal temperature in a furnace. Processconcept of novel hot chamber rheo-diecasting is simply based on the paradigm shift from HOW toWHERE for producing slurry-on-demand. This paper will demonstrate the possibility to achieveslurry-on-demand by novel hot chamber rheo-diecasting and the advantages for 3Cs applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.191.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Symmetry Behavior of Thixoextruded AZ31 Mg Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 749-753 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: This study was carried out to characterize thixoextruded AZ31 Mg alloy in terms of itssymmetric behavior through the optical microscope, electron back scattering diffraction andmechanical test. The elongated grains to the extrusion direction were generally observed during hotextrusion, while the thixoextruded microstructures were isotropic. Texture of hot extruded barshowed the strong fiber component, while that of thixoextruded bar was random distribution. Theaspect ratio of hot extruded bar was irregular at each position. On the contrary, the aspect ratio ofthixoextruded bar was almost uniform below 2 at each position
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.749.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Process Development of Low-Cost AgNi and AgFe Contact Materials with no Range of Solid Solubility (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 873-876 
    Details
    ISSN: 1662-8985
    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: AgNi and AgFe are known as contact materials with high workability and low contactresistance for medium to weak current contacts. However, AgNi and AgFe contact materials aredifficult to manufacture using conventional melting and casting procedure because they exhibit norange of solid solubility of Ni and Fe in Ag for all temperature range. The purpose of this research is todevelop a process for low-cost AgNi and AgFe contact materials based on solidification processcontrol. AgNi and AgFe contact materials were produced by rotation cylinder method (RCM). Thehardness value of AgNi and AgFe contact materials by RCM were higher than that of AgNi and AgFecontact materials produced by conventional powder metallurgy and co-precipitation processes. Thehigher hardness values of contact materials produced by RCM may be attributed to the uniformdistribution and small size of Ni and Fe particles in Ag matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.873.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Development of Novel Environment-Friendly Magnesium Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 940-943 
    Details
    ISSN: 1662-8985
    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: Novel environment-friendly magnesium alloys have been developed by alkaline earthmetal oxides addition without increasing cost and damaging process-ability. They can establishsimultaneously ① cleaner processing routes with reduced or without SF6 gas, ② melt cleanliness infurnace and during transfer and pouring, ③ improved process abilities of casting, forming, weldingand powder metallurgy such as fluidity, hot tearing susceptibility, inclusion and eutectic phase, ④ costreduction with low-cost elements as well as by reducing or eliminating high-cost protective gas likeSF6 gas, ⑤ original process abilities, ⑥ improved mechanical properties by grain refinement andinternal soundness, ⑦ improved welding performance and joint properties, ⑧ safety duringapplications by improving oxidation and flame resistance and ⑨ improved remelting and recyclingabilities. CaO, one of alkaline earth metal oxides, added Mg alloys can be well manufactured byconventional melting and casting without protective gas. This paper will discuss the effect of CaO onoptimum protective gas usage, oxidation resistance and flame behavior of magnesium alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.940.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Thixoextrusion for 7075 Al Wrought Alloy Tube (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 267-270 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The aim of this study was to improve extrudability limit, eliminate welding line and obtainoptimum thixoextrusion conditions for manufacturing tubes of 7075 Al wrought alloy. Bythixoextrusion, it was possible to improve deformability, control isotropy with extrusion direction,eliminate welding line (seamless) and save cost due to low energy consumption compared withconventional extrusion processes. The welded part was not observed at the welding line area. Thegrains of thixoextruded tube were homogeneously distributed and equiaxed grains were observed.Therefore, thixoextrusion is the most effective variable for the control of the magnitude of thewelding line
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.267.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Development of 2-Cavity Die Casting Process for AM50 Mg Steering Column Lock Housing Module (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 334-337 
    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: It is obvious that automotive industry worldwide is predicting significant growth in the use of magnesium alloys for weight reduction to decrease fuel consumption and emission. About a half decade ago, the price of magnesium alloys was more than twice that of aluminum alloys on a weight basis. Currently, magnesium alloys cost about one and a half times that of aluminum alloys on a weight basis, and thus the price of magnesium alloys is the same as or lower than that of aluminumalloys on a per volume basis. However, in considering the performance of magnesium components (not their specific mechanical properties) and recycling aspect of magnesium alloys, it is required to realize niche applications of magnesium alloys, which meet the cost requirement on performance basis and/or offer more than weight reduction. There are many other factors that make magnesium agood choice: component consolidation, improved safety for driver and passengers, and improved noise vibration and harshness (NVH), to name a few. As one of these efforts to adopt magnesium alloys in automotive component, this paper describes the research strategy of cold chamber type 2-cavity die casting of AM50 magnesium alloy for developing the steering column lock housingmodule with emphasis on cost driving factors and necessities for cost reduction, explaining why AM50 magnesium alloy is chosen with design and die casting process optimization
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.334.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Fluidity of A356 Alloy during In-Ladle DTC Rheocasting (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 354-357 
    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: There are two primary semisolid processing (S2P) routes, thixocasting and rheocasting. Especially, the rheocasting process has become a new focus in the field of semisolid process because of its many advantages such as increased shot size flexibility, no special SSM billet, inhouse recycling of scrap and smaller investment, compared with the thixoforming process. In-Ladledirect thermal control (DTC) rheocasting was developed, based on the fact that there is slurry and mush transition in molten metal, which is controlled by solid shape and relative interfacial energy. Fluidity is investigated by applying pressure casting for optimizing conditions of in-ladle DTC rheocasting of A356 Al alloy based on research results of simulation and actual microstructure control
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.354.pdf
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