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Microstructure evolution of Ti–46Al–6Nb–(Si,B) alloys during heat treatment with W addition

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Abstract

The cast ingots of Ti–46Al–6Nb–0.25Si–0.2B and Ti–46Al–6Nb–0.5W–0.25Si–0.2B (at%) were made by induction skull melting (ISM) technique. A series of heat treatments (HTs) were conducted to research the microstructure evolution of both alloys. Microstructure and tensile property were examined by scanning electron microscope (SEM), X-ray diffraction (XRD), transmission electron microscope (TEM), and tensile testing machine. The results show that microsegregation (liquid segregation and solid segregation) is exacerbated by the addition of 0.5 at% W; the addition of Nb, W in TiAl alloy makes the phase transition difficultly take place; then, the microstructures and tensile properties of both alloys are improved after certain HT processes; finally, the thicknesses of the γ/α2 lamellae after a certain HT process are significantly affected by the number of residual γ phases before the furnace-cooling moment.

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Acknowledgments

This research was financially supported by the National Natural Science Foundation of China (Nos. 51001040, 51371064) and the Shanghai Aerospace Science and Technology Innovation Fund (No. SAST201428).

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on Precision Heat Processing of Metals Technology, Harbin, 150001, China

    Shou-Zhen Cao, Shu-Long Xiao, Yu-Yong Chen, Jian-Chao Han & Yi Jia

  2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Shou-Zhen Cao, Shu-Long Xiao, Yu-Yong Chen, Jing Tian, Li-Juan Xu, Xiao-Peng Wang, Jian-Chao Han & Yi Jia

Authors
  1. Shou-Zhen Cao
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  2. Shu-Long Xiao
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  3. Yu-Yong Chen
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  4. Jing Tian
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  5. Li-Juan Xu
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Correspondence to Yu-Yong Chen.

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Cao, SZ., Xiao, SL., Chen, YY. et al. Microstructure evolution of Ti–46Al–6Nb–(Si,B) alloys during heat treatment with W addition. Rare Met. 35, 85–92 (2016). https://doi.org/10.1007/s12598-015-0653-8

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  • DOI: https://doi.org/10.1007/s12598-015-0653-8

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