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Solidification microstructure characteristics of Ti–44Al–4Nb–2Cr–0.1B alloy under various cooling rates during mushy zone

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Abstract

Beta-solidifying TiAl alloy has great potential in the field of aero-industry as a cast alloy. In the present work, the influence of cooling rate during mushy zone on solidification behavior of Ti–44Al–4Nb–2Cr–0.1B alloy was investigated. A vacuum induction heating device combining with temperature control system was used. The Ti–44Al–4Nb–2Cr–0.1B alloy solidified from superheated was melted to β phase with the cooling rates of 10, 50, 100, 200, 400 and 700 K·min−1, respectively. Results show that with the increase in cooling rate from 10 to 700 K·min−1, the colony size of α2/γ lamella decreases from 1513 to 48 μm and the solidification segregation significantly decreases. Also the content of residual B2 phase within α2/γ lamellar colony decreases with the increase in cooling rate. In addition, the alloy in local interdendritic regions would solidify in a hypo-peritectic way, which can be attributed to the solute redistribution and enrichment of Al element in solidification.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No. 51401168) and the Fundamental Research Funds for the Central Universities (No. 3102014JCQ01026).

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Authors and Affiliations

  1. The State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

    Peng Han, Hong-Chao Kou, Jie-Ren Yang, Guang Yang & Jin-Shan Li

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  1. Peng Han
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  2. Hong-Chao Kou
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  3. Jie-Ren Yang
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  4. Guang Yang
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Correspondence to Jie-Ren Yang.

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Han, P., Kou, HC., Yang, JR. et al. Solidification microstructure characteristics of Ti–44Al–4Nb–2Cr–0.1B alloy under various cooling rates during mushy zone. Rare Met. 35, 35–41 (2016). https://doi.org/10.1007/s12598-015-0633-z

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  • DOI: https://doi.org/10.1007/s12598-015-0633-z

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