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  • 2005-2009  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Development of Non-Dendritic Microstructure of Aluminum Alloy in Semi-Solid State under Ultrasonic Vibration (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 451-456 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The effect of processing parameters on the semi-solid microstructure has beeninvestigated in the course of semi-solid slurry preparation of A356 Al alloy by ultrasonic vibrationmethod. The A356 melt in temperature of 630660°C was poured into a special metal cup, andexposed to ultrasonic vibration at 20 kHz or isothermal holding for a certain time after vibration.The results show that the semi-solid slurry with primary α-Al crystals smaller than 90 μm and anaverage shape coefficient F S (SF was defined as SF4 A/L2P) above 0.5 could be prepared byultrasonic vibration for a time less than 144 s. In the isothermal holding period after a short time ofultrasonic vibration, the average particle diameter increased with the increase of holding time, butF S decreased at first, and then increased a little. It was discovered that ultrasonic vibration is a goodmethod to prepare semi-solid slurry with fine and relatively round primary crystals due to cavitationand acoustic streaming effects
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.451.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of Semi-Solid Slurry of Hypereutectic Al-Si Alloy by Ultrasonic Vibration (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 141-143 (July 2008), p. 767-771 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The preparation of semi-solid slurry of hypereutectic Al-Si alloy by Ultrasonic Vibration(USV) has been studied. The A390 alloy melt was poured into a preheated metal cup, andsubsequently the ultrasonic vibrator was dipped into the melt and USV was imposed. The solidifiedmicrostructure of the slurry has been analyzed, and the mechanical properties of the alloy have beentested by making samples through diecasting of the slurry. The results show that the primary Siparticles of A390 alloy became finer, rounder and uniformly distributed in microstructure of A390alloy slurry if imposed with USV, and average diameter of primary Si particles was about 20μm. WithUSV, the ultimate tensile strength and the hardness of rheo-casted samples increased by over 25% andnear 50% respectively besides the elongation rose by above 100%. After heat treatment, themechanical properties were further improved. In addition, the mechanism of preparation of semi-solidslurry of hypereutectic Al-Si alloy by USV is discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.767.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Mould Filling in Rheo-Diecasting Process of Semi-Solid Magnesium Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 116-117 (Oct. 2006), p. 554-557 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The mould-filling behavior of rheo-diecasting of semi-solid magnesium alloy anddiecasting of liquid magnesium alloy has been simulated with the computer program of numericalsimulation developed by the authors. Results show that, under the same diecasting conditions, thefilling behavior of rheo-diecasting of semi-solid metals is similar to the liquid diecasting, but mouldfilling of semi-solid slurry is steadier, and the slurry flows into the mould in a state similar tolamellar flow. The air entrapment in semi-solid process is much smaller than that of liquiddiecasting, and the castings made with semi-solid rheo-diecasting excel those with liquid diecastingin quality. Experimental results are in accord with the results of numeral simulation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.116-117.554.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Properties of Conversion Coating of Magnesium Alloys by a Phosphate-Permanganate Solution (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 665-668 
    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: A chromium-free conversion coating for AZ91D magnesium alloys has been obtained by using a phosphate-permanganate solution. Examinations have been carried out on the conversion coating for morphology, composition, adhesion force and corrosion resistance. Results show that the conversion coatings are relatively uniform and continuous, with thickness from 7µm to 10µm. They exhibit good adhesion to matrix and have some non-penetrate tiny holes on the surface. Themain elements of the conversion coating of AZ91D alloy are Mg、O、P、K、Al、Mn. Results of corrosion resistance test indicate that the corrosion resistance of the conversion coating by phosphate-permanganate solution is in match to that of the conversion coating formed in a chromate solution, but for the corrosion resistance after painting, the former is better than the later
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.665.pdf
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