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Fractal structures and their computer simulation in rapidly quenched Ai-Mn alloys

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Abstract

The microstructure of rapidly quenched A1-Mn alloys were studied by TEM and SEM. The icosahedral phase in AI-Mn alloys was observed to show various types of fractal morphologies, which may be classified into four kinds: 1) dendritic shape, 2) flower-like shape, 3) granular shape and 4) grain-oscillation shape. After being digitized by a computer, the fractal dimensions (D) of these morphologies were calculated. Based on the traditional diffusion limited aggregation (DLA) model computer simulations were made with two-seeded and many-seeded clusters, which reflect the growing mechanism of some fractal structures in A1-Mn alloys. It is suggested that these fractal structures are formed by many icosahedral particles about 20 nm in size aggregating during the rapid quenching process.

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Authors and Affiliations

  1. Department of Materials Science, Nanchang University, Nanchang, China

    Meng Zhang & Pinsheng Yang

  2. Computer Centre, Nanchang University, Nanchang, China

    Chunyong Hong

  3. Department of Biological Science, Nanchang University, Nanchang, China

    Hong Dai

  4. Department of Materials Science, Xian Jiaotong University, Xian, China

    Meng Zhang & Yuxi Tan

Authors
  1. Meng Zhang
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  2. Chunyong Hong
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  3. Hong Dai
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  4. Pinsheng Yang
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  5. Yuxi Tan
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Zhang, M., Hong, C., Dai, H. et al. Fractal structures and their computer simulation in rapidly quenched Ai-Mn alloys. Metals and Materials 5, 43–47 (1999). https://doi.org/10.1007/BF03026003

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  • DOI: https://doi.org/10.1007/BF03026003

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