混沌对流下的半固态A356铝合金初生相形貌演变研究<sup>*</sup>

doi:10.11900/0412.1961.2015.00228

金属学报

2016, Vol. 52

Issue (2): 177-183 DOI: 10.11900/0412.1961.2015.00228

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混沌对流下的半固态A356铝合金初生相形貌演变研究^*

刘政¹(

),张嘉艺²,罗浩林²,邓可月¹

1 江西理工大学机电工程学院, 赣州 341000
2 江西理工大学材料科学与工程学院, 赣州 341000

RESEARCH ON MORPHOLOGY EVOLUTION OF PRIMARY PHASE IN SEMISOLID A356 ALLOY UNDER CHAOTIC ADVECTION

Zheng LIU¹(

),Jiayi ZHANG²,Haolin LUO²,Keyue DENG¹

1 School of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2 School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

引用本文:

刘政,张嘉艺,罗浩林,邓可月. 混沌对流下的半固态A356铝合金初生相形貌演变研究^*[J]. 金属学报, 2016, 52(2): 177-183.
Zheng LIU, Jiayi ZHANG, Haolin LUO, Keyue DENG. RESEARCH ON MORPHOLOGY EVOLUTION OF PRIMARY PHASE IN SEMISOLID A356 ALLOY UNDER CHAOTIC ADVECTION[J]. Acta Metall Sin, 2016, 52(2): 177-183.

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摘要:

研究了半固态A356铝合金熔体中混沌对流的表征, 及电磁场诱发的混沌对流对半固态A356铝合金熔体中初生相形貌演变的影响. 通过Fluent软件研究了电磁场作用下A356铝合金熔液中微粒的流动轨迹, 计算了这些流动轨迹的Kolmogorov熵和分形维数, 证明了施加适当的电流频率能在合金熔体中产生混沌运动. 结合实验研究, 对不同电流频率及工艺参数的实验结果进行对比. 研究结果表明, A356铝合金熔体在650 ℃浇注, 电流频率为30 Hz的电磁场中搅拌15 s, 并在590 ℃保温10 min, 此时凝固系统的Kolmogorov熵为6829.5 nat/s, 分形维数为2.2439, 初生相的平均等积圆直径为59.86 μm, 平均形状因子为0.71, 此时晶粒最圆整细小, 组织形貌最佳.

关键词 ：半固态A356铝合金, 混沌对流, Kolmogorov熵, 分形维数, 电磁搅拌

Abstract：

Chaotic advection could be strengthened mix, mass transfer and heat transfer in the viscous fluid, the melt flow forming was affected by electromagnetic field in the metal solidification process, so were the macro and microstructure of materials. So it was necessary to study chaotic characteristics of semisolid Al alloy in the electromagnetic field. The characterization of chaotic convention and morphology of primary phase were mainly researched in semisolid A356 alloy under the electromagnetic field. The trajectories of the particle in semisolid A356 alloy melt was simulated by the computational fluid dynamics software Fluent, the Kolmogorov entropy and fractal dimension of the flow trajectories of semisolid A356 alloy melt were judged and analyzed. The results showed that chaotic advection may happen in semisolid alloy melt under electromagnetic field. Combined with experiment, the results of process parameters and different current frequencies were compared. The results showed that the primary phase with 59.86 μm in average equal-area circle diameter, 0.71 in average shape factor, 6829.5 nat/s of Kolmogorov entropy and 2.2439 of fractal dimension can be obtained in semisolid A356 alloy with pouring 650 ℃, stirring for 15 s at 30 Hz, and holding at 590 ℃ for 10 min. Meanwhile, the morphology of primary phase can be observed with the best parameters.

Key words： semisolid A356 alloy chaotic advection Kolmogorov entropy fractal dimension electromagnetic stirring

收稿日期: 2015-04-20

基金资助:*国家自然科学基金项目51144009和51361012, 江西省自然科学基金项目20142bab206012以及江西省教育厅科技项目GJJ14407资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00228 或 https://www.ams.org.cn/CN/Y2016/V52/I2/177

图1 微粒在未施加电磁场和施加不同频率电磁场下的运动轨迹

图2 不同频率下凝固系统的Kolmogorov熵和分形维数变化趋势图

图3 未经电磁搅拌和不同电磁搅拌频率下半固态A356铝合金初生相形貌

图4 不同电磁搅拌频率下初生相的平均等积圆直径和平均形状因子

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