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Microstructure and property of directionally solidified Ni–Si hypereutectic alloy

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Abstract

This paper investigates the influence of the solidification rate on the microstructure, solid/liquid interface, and micro-hardness of the directionally solidified Ni–Si hypereutectic alloy. Microstructure of the Ni–Si hypereutectic alloy is refined with the increase of the solidification rate. The Ni–Si hypereutectic composite is mainly composed of α-Ni matrix, Ni–Ni3Si eutectic phase, and metastable Ni31Si12 phase. The solid/liquid interface always keeps planar interface no matter how high the solidification rate is increased. This is proved by the calculation in terms of M–S interface stability criterion. Moreover, the Ni–Si hypereutectic composites present higher micro-hardness as compared with that of the pure Ni3Si compound. This is caused by the formation of the metastable Ni31Si12 phase and NiSi phase during the directional solidification process.

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Acknowledgments

The authors would like to thank the National Nature Science Foundation of China (51201121) and the Natural Science Foundation of Shaanxi Province of China (2012JQ6004) for financial support.

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Authors and Affiliations

  1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Chunjuan Cui, Lulu Tian & Shengnan Yu

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

    Jun Zhang, Lin Liu & Hengzhi Fu

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  1. Chunjuan Cui
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  2. Lulu Tian
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  3. Jun Zhang
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  4. Shengnan Yu
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  5. Lin Liu
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  6. Hengzhi Fu
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Correspondence to Chunjuan Cui.

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Cui, C., Tian, L., Zhang, J. et al. Microstructure and property of directionally solidified Ni–Si hypereutectic alloy. Appl. Phys. A 122, 213 (2016). https://doi.org/10.1007/s00339-016-9702-x

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  • DOI: https://doi.org/10.1007/s00339-016-9702-x

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