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      Efficacy of Borides in Grain Refining Al-Si Alloys

      Bolzoni, Leandro; Hari Babu, Nadendla
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      Efficacy of Borides in Grain Refining Al-Si Alloys.pdf
      Published version, 1.071Mb
      DOI
       10.1007/s11661-018-5017-1
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      Bolzoni, L., & Hari Babu, N. (2018). Efficacy of Borides in Grain Refining Al-Si Alloys. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. https://doi.org/10.1007/s11661-018-5017-1
      Permanent Research Commons link: https://hdl.handle.net/10289/12279
      Abstract
      The grain refining efficacy of titanium, aluminum, and niobium borides, as well as niobium aluminides, introduced via commercial and lab made master alloys on Al-Si alloys was investigated. Significant grain refinement is achieved via the introduction of these heterogeneous nuclei regardless of their chemistry, stoichiometry of the master alloy, and addition rate. However, the grain refinement is affected by variable such as contact time, as the inoculating particle may sediment or be poisoned, and cooling rate. Specifically, a faster cooling rate generally leads to finer grains due to the lower time for grain growth. In the case of borides, the chemical inoculation efficiency is greatly affected by their thermodynamic stability in molten Al-Si alloys. Conversely, the grain refining potency of properitectic Al3Nb remains unaffected. The underlying grain refining mechanism was finally investigated using current models based on the growth restriction factor Q to simultaneously consider the effect of nucleant potency and alloy chemistry. Among Ti-, Al-, and Nb-based borides with similar particle size and distribution, the latter are the most efficient to grain refine Al-Si alloys.
      Date
      2018
      Type
      Journal Article
      Rights
      © The Author(s) 2018
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      • Science and Engineering Papers [3124]
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