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Comparison of a Directionally Solidified TiAl Alloy by Φ15 mm Cylindrical and 29 × 6 mm Plate Y2O3 Molds

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Abstract

To begin a preliminary exploration on the effect of shape, the effect of a novel shaped 29 × 6 mm plate mold on the microstructure and mechanical properties of directionally solidified (DS) Ti-45Al-2Cr-2Nb was investigated. For comparison, Φ15 mm cylindrical molds with an equivalent cross-sectional area were used. Experimental results show that the typical microstructures of the DS region in all samples consist of regular well aligned α 2/γ lamellar structure, B2 phase and Y2O3 particles. Due to the lower strength of flow generated by the shape factor of the mold, the plate sample has coarser lamellae and more B2 phase, but fewer Y2O3 particles. Additionally, the room temperature (RT) fracture toughness and tensile properties of the plate sample are improved.

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Acknowledgements

We gratefully acknowledge the support of this work by National Nature Science Foundation of China (Grant No. 51471062).

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Authors and Affiliations

  1. National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, China

    Hailong Zhang, Hongsheng Ding, Qiang Wang, Ruirun Chen, Jingjie Guo & Hengzhi Fu

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  1. Hailong Zhang
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  2. Hongsheng Ding
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  3. Qiang Wang
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  4. Ruirun Chen
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  5. Jingjie Guo
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  6. Hengzhi Fu
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Correspondence to Hongsheng Ding.

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Zhang, H., Ding, H., Wang, Q. et al. Comparison of a Directionally Solidified TiAl Alloy by Φ15 mm Cylindrical and 29 × 6 mm Plate Y2O3 Molds. JOM 69, 1812–1817 (2017). https://doi.org/10.1007/s11837-017-2475-7

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  • DOI: https://doi.org/10.1007/s11837-017-2475-7

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