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  • 1
    Electronic Resource
    Electronic Resource
    Study of Microstructural Evolution and Phase’s Morphology after Partial Remelting in A356 Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 367-372 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: 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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.367.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of Microstructural Changes in a SIMA Processed A356 Aluminum Alloy after Unidirectional Compression and Rolling: Effect of Pressure Depth (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 391-396 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: 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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.391.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Transport by intermittent convection in the boundary of the DIII-D tokamak (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 4826-4833 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Intermittent plasma objects (IPOs) featuring higher pressure than the surrounding plasma, and responsible for ∼50% of the E×BT radial transport, are observed in the scrape off layer (SOL) and edge of the DIII-D tokamak [J. Watkins et al., Rev. Sci. Instrum. 63, 4728 (1992)]. Conditional averaging reveals that the IPOs, produced at a rate of ∼3×103 s−1, are positively charged and also polarized, featuring poloidal electric fields of up to 4000 V/m. The IPOs move poloidally at speeds of up to 5000 m/s and radially with E×BT/B2 velocities of ∼2600 m/s near the last closed flux surface (LCFS), and ∼330 m/s near the wall. The IPOs slow down as they shrink in radial size from 4 cm at the LCFS to 0.5 cm near the wall. The IPOs appear in the SOL of both L and H mode discharges and are responsible for nearly 50% of the SOL radial E×B transport at all radii; however, they are highly reduced in absolute amplitude in H-mode conditions. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1406940
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