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  • Digitale Medien  (3)
  • 2005-2009  (3)
Datenquelle
Materialart
  • Digitale Medien  (3)
Erscheinungszeitraum
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Melt Conditioned Direct Chill Casting (MC-DC) of Wrought Al-Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 403-408 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: Melt Conditioned Direct Chill (MC-DC) casting is a new development for producinghigh-quality billets and slabs. In the MC-DC process, liquid metal is continuously fed into aMCAST (melt conditioning by advanced shear technology) machine, where the liquid metal issubjected to high shear rate and high degree of turbulence provided by a twin screw mechanism attemperatures either above or below the alloy liquidus, and the conditioned liquid metal is then fedcontinuously into a Direct Chill (DC) caster to produce billets or slabs. The MC-DC process isapplicable to both Al- and Mg-alloys. In this paper we present our experimental investigations of theeffects of processing parameters on the microstructural and compositional uniformity of 5xxx and7xxx series Al-alloys. It has been confirmed by our experiments that the MC-DC process canproduce billets and slabs with fine and uniform microstructure, uniform chemical compositions andmuch reduced cast defects, such as porosity and cracks
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.403.pdf
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  • 2
    Digitale Medien
    Digitale Medien
    Processing of Al-45Sn-10Cu Based Immiscible Alloy by a Rheomixing Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 529-534 
    Details
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: The growing importance of Al-Sn based alloys for producing self lubricating bearingmaterials in automotive industries necessitates the development of new alloys for improvedperformance. The recent thermodynamic work by Schmid-Fetzer at Clausthal University ofTechnology predicted that the addition of Cu to the binary Al-Sn system makes the miscibility gapstable. With the guidance of the calculated phase diagram, experimental investigations wereconducted on the ternary Al-Sn-Cu system to understand the solidification behaviour of thisimmiscible system under intensive forced convection. The experimental focus was to investigate theeffects of shear rate, shearing temperature and cooling rate on the solidified microstructure
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.529.pdf
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  • 3
    Digitale Medien
    Digitale Medien
    Solidification Behaviour of 357 Al-Alloy under Intensive Forced Convection (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 1747-1752 
    Details
    ISSN: 1662-9752
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Solidification behaviour of 357 Al-alloy under intensive forced convection in the rheo-die-casting(RDC) process, was investigated experimentally to understand the effects of the intensity of forcedconvection and shearing time on the nucleation and growth behaviour. It was found that underintensive forced convection, heterogeneous nucleation occurred continuously throughout the entirevolume of the solidifying melt. All the nuclei could survive due to the uniform temperature andcomposition fields created by the forced convection. This has been named as ‘effective andcontinuous nucleation’. It is also found that the nuclei grow spherically with an extremely fastgrowth rate. This makes the primary solidification essentially a slow coarsening process, in whichOstwald ripening takes place by dissolution of the smaller particles. In addition, it was found thatintensive forced convection suppresses partially the formation of the primary phase, promotenucleation of the primary particles, and hinders the particle growth
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1747.pdf
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