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Microstructural evolution and mechanical properties of Ni–45Ti–5Al–2Nb–1Mo alloy subjected to different heat treatments

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Abstract

The effects of solution and aging heat treatment on microstructural evolution and room temperature tensile properties for as-forged Ni–45Ti–5Al–2Nb–1Mo alloy were investigated through scanning electron microscopy (SEM), transmission electron microscopy (TEM) and tensile tests. The results show that the microstructure of solution-treated alloy comprises NiTi matrix, Ti2Ni and (Nb,Ti)SS phases. After aging treatment at 700 °C for 6 and 100 h, the distribution of Ti2Ni and (Nb,Ti)SS precipitates increases in uniformity. No new type of precipitate is observed in the specimen aged at 700 °C. After aging at 800 °C for 100 h, numerous nanosized Ni2TiAl phases are precipitated within the grains. Solution and aging treatments improve the tensile properties at room temperature. Tensile strength and ductility are improved after solution treatment at 1100 °C plus aging treatment at 800 °C for 6 h or 700 °C for 100 h. With aging time prolonging to 100 h at 800 °C, the precipitation of fine Ni2TiAl particles leads to the improvement in tensile strength and deterioration of elongation.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Nos. 51571036 and 51201016).

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Authors and Affiliations

  1. State Key Laboratory of Nonferrous Metals and Processes, GRIMAT Engineering Institute Co. Ltd, Beijing, 101407, China

    Xiao-Yun Song

  2. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Yan Li & Fei Zhang

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  1. Xiao-Yun Song
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  2. Yan Li
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  3. Fei Zhang
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Correspondence to Xiao-Yun Song.

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Song, XY., Li, Y. & Zhang, F. Microstructural evolution and mechanical properties of Ni–45Ti–5Al–2Nb–1Mo alloy subjected to different heat treatments. Rare Met. 42, 2774–2780 (2023). https://doi.org/10.1007/s12598-019-01318-y

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  • DOI: https://doi.org/10.1007/s12598-019-01318-y

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