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Liu Z.,Jiangxi University of Science and Technology | Liu Z.,Jiangxi Nonferrous Metal Processing Engineering Research Center | Hu Y.,Jiangxi Nonferrous Metal Processing Engineering Research Center | Hu Y.,Jiangxi University of Science and Technology | Liu X.,Jiangxi University of Science and Technology
Acta Metallurgica Sinica (English Letters) | Year: 2010

Semi-solid Al7Si0.3Mg alloy slurry, which is grain-refined by yttrium, is manufac- tured by low temperature pouring. The effects of grain-refined by yttrium on the morphology and the grain size of the primary α-Al in semi-solid Al7Si0.3Mg alloy are researched. The results indicate that semi-solid Al7Si0.3Mg alloy with particle-like and rosette-like primary α-Al can be prepared by low temperature pouring from liquid Al7Si0.3Mg alloy grain-refined by yttrium. The grain size and particle morphology of primary α-Al in Al7Si0.3Mg alloy are markedly improved by 0.5 wt pct Y. The refining mechanism of Y on the morphology and the grain size of the primary α-Al in semi-solid Al7Si0.3Mg alloy are delved.


Liu Z.,Jiangxi University of Science and Technology | Liu Z.,Jiangxi Nonferrous Metal Processing Engineering Research Center | Mao W.-M.,University of Science and Technology Beijing | Liu X.-M.,Jiangxi University of Science and Technology
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2010

The effects of slight electromagnetic stirring on morphology of primary phase in semisolid A356 prepared by low superheat pouring and slight electromagnetic stirring were researched, and some characteristic parameters characterized the morphology and grain size of the primary phase were calculated. The results indicate that the stirring power has an important effect on the morphology and the grain size. The characteristics of the morphology could be characterized by the fractal dimensions and the shape factors. The fractal dimension and the shape factor change when the morphology changes with processing conditions. Both increase with the increase of the stirring power, but the fractal dimension is still affected by the grain size. The increase of stirring power could obviously improve the grain size, fractal dimension and shape factor of the primary phase. © 2010 The Nonferrous Metals Society of China.


Liu Z.,Jiangxi University of Science and Technology | Liu Z.,Jiangxi Nonferrous Metal Processing Engineering Research Center | Chen M.,Jiangxi University of Science and Technology | Shi K.,Jiangxi University of Science and Technology
Zhuzao/Foundry | Year: 2010

Mg 2Si/Al-Si composites modified by P and La were manufactured by casting process, and the effects of T6 heat treatment on microstructures and properties of the composites were researched. The results indicate that the Mg 2Si particles and eutectic Si are granulated to a certain extent during T6 treatment. The hardness and wear resistance of the composites monotonously decrease with increase of the solution temperature, and monotonously rise with increase of aging temperature during the test. After 500°C×10 h solution treatment and 175°C×10 h aging treatment the hardness and wear resistance raised by 21.76% and 60.3%, respectively compared to that without heat treatment.

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