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The free growth criterion for grain initiation in TiB 2 inoculated γ-titanium aluminide based alloys

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Abstract

γ-titanium aluminide (γ-TiAl) based alloys enable for the design of light-weight and high-temperature resistant engine components. This work centers on a numerical study of the condition for grain initiation during solidification of TiB2 inoculated γ-TiAl based alloys. Grain initiation is treated according to the so-called free growth criterion. This means that the free growth barrier for grain initiation is determined by the maximum interfacial mean curvature between a nucleus and the melt. The strategy presented in this paper relies on iteratively increasing the volume of a nucleus, which partially wets a hexagonal TiB2 crystal, minimizing the interfacial energy and calculating the corresponding interfacial curvature. The hereby obtained maximum curvature yields a scaling relation between the size of TiB2 crystals and the free growth barrier. Comparison to a prototypical TiB2 crystal in an as cast γ-TiAl based alloy allowed then to predict the free growth barrier prevailing under experimental conditions. The validity of the free growth criterion is discussed by an interfacial energy criterion.

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Authors and Affiliations

  1. Institute of Materials Physics and Materials Technology, Hamburg University of Technology, Eißendorfer Str. 42, 21073, Hamburg, Germany

    D. Gosslar & R. Günther

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  1. D. Gosslar
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  2. R. Günther
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Correspondence to D. Gosslar.

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Gosslar, D., Günther, R. The free growth criterion for grain initiation in TiB 2 inoculated γ-titanium aluminide based alloys. Eur. Phys. J. Spec. Top. 223, 559–565 (2014). https://doi.org/10.1140/epjst/e2014-02109-y

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  • DOI: https://doi.org/10.1140/epjst/e2014-02109-y

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