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Microstructure characterization and tensile properties of a Ni-containing TiAl-based alloy with heat treatment

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Abstract

The effects of Ni addition on solidification microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy were investigated using differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy-dispersive spectroscope (EDS) and transmission electron microscopy (TEM). Results show that with 3 at% Ni addition, the as-cast microstructure is mainly composed of fine lamellar colonies (~50 μm), γ grains and Ni-riched τ3 phase. After heat treatment at 1380 °C, the Ni-containing alloy is characterized by fine fully lamellar microstructure (~90 μm). The heat-treated Ni-containing specimen exhibits superior room temperature tensile properties than other specimens. The tensile properties are discussed in light of the microstructure evolution and role of Ni-riched τ3 phase.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (Nos. 51001040, 51371064 and 51504075) and the Shanghai Aerospace Science and Technology Innovation Fund (No. SAST201428).

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Authors and Affiliations

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

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

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

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

  3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

    Yu-Yong Chen

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  1. Jian-Chao Han
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  2. Shu-Long Xiao
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Correspondence to Yu-Yong Chen.

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Han, JC., Xiao, SL., Tian, J. et al. Microstructure characterization and tensile properties of a Ni-containing TiAl-based alloy with heat treatment. Rare Met. 35, 26–34 (2016). https://doi.org/10.1007/s12598-015-0626-y

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  • DOI: https://doi.org/10.1007/s12598-015-0626-y

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