Taper barrel rheomoulding process for semi-solid slurry preparation and microstructure evolution ofA356 aluminum alloy

The self-developed taper barrel rheomoulding （TBR） machine for light alloy semi-solid slurry preparation was introduced. The semi-solid slurry was obtained from the intense shearing turbulence of the alloy melt in the cause of solidification, which was further caused by the relative rotation of the...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2010, Vol.20 (9), p.1677-1684
Main Author: 张帆 康永林 杨柳青 丁瑞华
Format: Article
Language:English
Subjects:
A356铝合金
剪切湍流
半固态浆料
半固态组织
合金熔体
显微结构
浆料制备
演化过程
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Summary:The self-developed taper barrel rheomoulding （TBR） machine for light alloy semi-solid slurry preparation was introduced. The semi-solid slurry was obtained from the intense shearing turbulence of the alloy melt in the cause of solidification, which was further caused by the relative rotation of the internal and external taper barrel whose surface contained wale and groove. The heat transmission model of TBR process, the flow rules and the shearing model of the alloy melt were deduced. Taking A365 as experimental material, the microstructure evolution rules under different slurry preparation processes were analyzed. The results show that decreasing the pouring temperature of A365 alloy melt properly or increasing the shearing rate helps to obtain ideal semi-solid microstructure with the primary particle size of about 70 μm and the shape factor of above 0.8.
ISSN:1003-6326