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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 725-730 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Aluminum alloys are increasingly used in automotive and aeronautic applications toproduce high performance, lightweight parts. Among the reasons for this, is the emergence of highintegrity processes (HIP), which widens the field of application for cast aluminum alloys. In fact,metallurgical quality and consistency that characterize components produced by HIP are necessaryfor critical safety components. In addition to attaining maximum strength, critical safetycomponents need to be ductile and resistant to cyclic loading. According to the North American DieCasting Association, rheocasting is a high integrity process capable of producing parts with fewerdefects than conventional casting process. Rheocast components are known to have bettermechanical properties than permanent mold castings. Moreover, they can be heat-treated which isimpractical in the case of classical die cast components. However, the fatigue behavior of rheocastaluminum alloys has been investigated since about 2000 and few results have been published onthis subject. This paper reviews the studies of fatigue behavior of aluminum semi-solid castcomponents. Published experimental results on high cycle fatigue resistance (S-N diagrams), longcrack propagation, crack closure effects and short crack particularities are presented
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 231-236 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Magnesium alloys are increasingly used in automotive, aeronautic and electronicapplications to produce high performance, light weight parts. In the thixomolding process the semisolidslurry is injected into a mold at controlled temperature such that the melt has specific flowbehavior. This allows the fabrication of near net shape components with controlled microstructureand good mechanical properties. The numerical modeling of such applications presents unusualchallenges for both the physical modeling and the solution algorithm. This paper presents 3Dsolutions of the injection molding of semi-solid AZ91 magnesium alloys. The methodology dealswith the shear thinning, temperature dependent viscosity behavior and is able to accurately solve thehigh velocity flows encountered during semi-solid magnesium molding. The approach is applied tothe injection of a tensile bar and the results compared with experimental data. The numericalsolutions indicate that the material forms a jet at the exit of the gate and a swirling flow forms as thematerial advances along the first larger diameter section. The wall regions are filled first, leaving avoid inside. This agrees very well with the experimental observation
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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