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  • 2005-2009  (2)
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  • 2005-2009  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 367-372 
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: In this work, effective parameters of SIMA process to obtain non dendriticmicrostructure in A356 alloy were investigated. In addition, the effect of SIMA process on theevolution of morphology of silicon and intermetallic phases in this alloy was studied.Microstructure images obtained from optical microscopy and SEM observation showed thatincrease in plastic work up to 40% and then holding of samples in the semi solid state attemperature of 580oC, causes that primary dendritic structure changes to non dendritic, fine andglobular structure, but optimum reheating time completely depended on initial thickness of samples.If all parameters of SIMA process are the same, the grain boundaries of thinner samples begin towet and following globalization will be completed in shorter reheating time rather than thicker ones.Moreover, it was found that the intermetallic phases lost their angular or needle morphology andgradually changed to rounded morphology and even to globular form. Also the optimum reheatingtime thoroughly depends on primary casting microstructure as the finer casting microstructure beginto globalize faster than thicker one under more little stains
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 391-396 
    ISSN: 1662-9779
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Physik
    Notizen: In this study, in order to compare effect of unidirectional compression and rolling onfinal microstructure of strain induced melt activated (SIMA) A356 aluminum alloy, rectangularsamples with dimensions of 3cm×5cm in area and 1cm in thickness and cylindrical specimens with2.5cm in diameter and 1cm in length, have been prepared for rolling and compressing processes,respectively. Then, these samples were plastically deformed at a same strain in ambienttemperature. Afterward, the strained samples were cut into equal quarters. In the next stage, toproduce globular microstructure, these specimens were partially remelted in 580°C for differenttimes. Results obtained from light microscopy showed that specimen's thickness and so, its strainaffected zones influence on the globulization of dendrites. In addition, it was seen that at a givenstrain and constant diameter, increase of H/D ratio led to increase of needed time for reaching acertain sphericity in cylindrical samples. Also, it was showed that microstructural evolutions duringSIMA processing of both rolled and unidirectional compressed samples were relatively identical.However, at a same condition, ultimate size of globulized dendrites in the rolled samples wassmaller than those of compressed ones
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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