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| EVOLUTION OF MICROSTRUCTURE OF SEMISOLID METAL SLURRY IN ULTRASOUND FIELD |
| ZHAO Junwen;WU Shusen;WAN Li;CHEN Qihua;AN Ping |
| State Key Lab of Material Processing and Die & Mould Technology; Huazhong University of Science and Technology; Wuhan 430074 |
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Cite this article:
ZHAO Junwen WU Shusen WAN Li CHEN Qihua AN Ping. EVOLUTION OF MICROSTRUCTURE OF SEMISOLID METAL SLURRY IN ULTRASOUND FIELD. Acta Metall Sin, 2009, 45(3): 314-319.
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Abstract The microstructural evolution of semisolid ZL101 hypoeutectic Al--Si alloy solidified in ultrasound field was investigated. The results indicate that the morphology of primary particles is related closely to the temperature of the applied ultrasound field. The primary grains grow into globular shape when ultrasound is applied from 640 to 585 ℃ (nearly solidified temperature) When the ultrasound is applied from 610 (solid fraction 0.1) to 598 ℃ (applied 120 s), the originally formed dendrites are granulated. When the ultrasound is applied at 600 ℃ (solid fraction 0.25) and holding temperature for 120 s (about 595 ℃), a mixture structure consisted of dendrite and granulated grains is formed. The evolution mechanism of semisolid microstructure under ultrasound field was discussed.
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Received: 25 June 2008
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| Fund: Supported by National Natural Science Foundation of China (No.50775086) and National High Technology Research and Development Program of China (No.2007AA03Z557) |
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