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Tailoring the Microstructure of a β-Solidifying TiAl Alloy by Controlled Post-solidification Isothermal Holding and Cooling

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Abstract

In this study, the microstructure of a β-solidifying TiAl alloy was modified by means of temperature-controlled cooling. The microstructural evolution of the Ti-44.5Al-4Nb-2Cr-0.1B alloy in different cooling processes was investigated. The results showed firstly that both the solidification-segregation (S-segregation) and β-segregation were reduced considerably by raising the temperature or extending the time in the single β-phase region. Then samples were cooled through the β + α phase region at the cooling rates of 2, 50, and 650 K/min. The B2-phase and some large γ-phases exist in lamellar microstructure, which might be more evident at a higher cooling rate. Further, the Burgers relationships of {0001} α2//{110} β(B2) and {11\( \bar{2} \)0} α2//{111} β(B2) were identified in the fast cooling microstructure, and the non-Burgers equiaxed α-grains grew easily at a slow cooling rate.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (No. 51401168), the Shaanxi Provincial Natural Science Foundation (No. 2016JQ5087), the Fundamental Research Funds for the Central Universities (No. 3102014JCQ01026), and the Aeronautical Science Foundation of China (No. 2014ZF53065).

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Authors and Affiliations

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

    Jieren Yang, Xuyang Wang, Bei Cao, Yulun Wu, Keren Zhang & Rui Hu

Authors
  1. Jieren Yang
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  2. Xuyang Wang
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  3. Bei Cao
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  4. Yulun Wu
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  5. Keren Zhang
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  6. Rui Hu
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Correspondence to Jieren Yang.

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Manuscript submitted December 13, 2016.

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Yang, J., Wang, X., Cao, B. et al. Tailoring the Microstructure of a β-Solidifying TiAl Alloy by Controlled Post-solidification Isothermal Holding and Cooling. Metall Mater Trans A 48, 5095–5105 (2017). https://doi.org/10.1007/s11661-017-4209-4

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  • DOI: https://doi.org/10.1007/s11661-017-4209-4

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