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1 results

  • Faceted–nonfaceted growth transition and 3-D morphological evolution of primary Al6Mn microcrystals in directionally solidified Al–3 at.% Mn alloy

  • Huijun Kang, Tongmin Wang, Xinzhong Li, Yanqing Su, Jingjie Guo, Hengzhi Fu
  • Journal:
    Journal of Materials Research / Volume 29 / Issue 11 / 14 June 2014
    Published online by Cambridge University Press:
    09 June 2014, pp. 1256-1263
    Print publication:
    14 June 2014

  • A comprehensive understanding of the growth pattern of intermetallic compounds (IMCs) during solidification is critical to both the crystal-growth theory and its property optimization. In this article, growth pattern and three-dimensional (3D) morphology of primary Al6Mn IMC were investigated in directionally solidified Al–3 at.% Mn alloy at a wide range of growth rates. A transition from faceted (<60 μm/s) to nonfaceted growth (>100 μm/s) was observed with increasing growth rates. Correspondingly, 3D morphologies of primary Al6Mn change from a solid polyhedron to a hollow structure, and then to a dendrite. This kind of change is associated with the competitive growths of different crystal planes determined by the crystallographic anisotropy and growth kinetics of Al6Mn. A growth model based on atomic cluster attachment is proposed to reveal the growth transition, and a growth-rate ratio between different crystal planes is used to appropriately reveal the formation mechanism of different morphologies at low rates.