Acta Metallurgica Sinica (English Letters) ›› 2009, Vol. 22 ›› Issue (6): 421-428.DOI: 10.1016/S1006-7191(08)60118-0

• 研究论文 • 上一篇    下一篇

半固态A356铝合金初生相形貌的分形特征研究

刘政1;刘小梅1;胡春晖1;毛卫民 2   

  1. 1. 江西理工大学
    2. 北京科技大学材料科学与工程学院铸造研究所
  • 收稿日期:2009-02-23 修回日期:2009-06-20 出版日期:2009-12-25 发布日期:2009-12-16
  • 通讯作者: 刘政

Research on fractal characteristics of primary phase morphology in semi-solid A356 alloy

Zheng LIU1,2, Xiaomei LIU1,Chunhui HU2,Weimin MAO3   

  1. 1) Faculty of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology,Ganzhou 341000, China
    2) Jiangxi Nonferrous Metal Processing Engineering Research Center, Ganzhou 341000, China
    3) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing
  • Received:2009-02-23 Revised:2009-06-20 Online:2009-12-25 Published:2009-12-16
  • Contact: Zheng LIU

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摘要：

利用低过热度浇注和弱电磁搅拌工艺制备了A356铝合金半固态浆料，研究了半固态A356铝合金初生相形貌的分形特征。应用编制的计算程序计算了半固态A356铝合金初生相形貌的分形维数。结果表明，低过热度浇注和弱电磁搅拌工艺制备的半固态A356铝合金初生相的形貌可以用分形维数来表征，铸锭中不同部位半固态初生相的形貌具有不同的分形维数，反映了同一铸锭不同部位的凝固条件对半固态初生相形貌的影响。

关键词: 半固态, 初生相形貌, 分形, A356铝合金 semi-solid, morphology of primary phase, fractal, A356 alloy

Abstract:

Semi-solid slurry of A356 alloy was prepared by low superheat pouring and slightly electromagnetic stirring, and the fractal characteristics of morphology in semi-solid primary phase was researched. The fractal dimensions of primary phase morphology in the semi-solid A356 alloy were calculated by the program written to calculate the fractal dimensions of box-counting in the image of solid phase morphology in semi-solid metal slurry. The results indicated that the morphology of primary phase in semi-solid A356 prepared by low superheat pouring and slightly electromagnetic stirring is characterized by fractal dimension, and the primary phase morphology obtained by the different processing parameters has different fractal dimensions. The morphology of primary phase at the different position of ingot has different fractal dimensions, which reflected the effect of solidified conditions at different positions in the same ingot on the morphology of semi-solid primary phase. Solidification of semi-solid alloy is a course of change in fractal dimension.

Key words: Semi-solid, Morphology of primary phase, Fractal, A356 alloy