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Microstructure Characterization and Fracture Toughness of Laves Phase-Based Cr–Nb–Ti Alloys

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Three Laves phase-based alloys with nominal compositions of Cr2Nb–xTi (x = 20, 30, 40, in at%) have been prepared through vacuum non-consumable arc melting. The results show that the microstructures of Cr2Nb-(20, 30) Ti alloys are composed of the primary Laves phase C15–Cr2(Nb,Ti) and bcc solid solution phase, while the microstructure of Cr2Nb–40Ti alloy is developed with the eutectic phases C15–Cr2(Nb,Ti)/bcc solid solution. The measured fracture toughness of ternary Laves phase C15–Cr2(Nb,Ti) is about 3.0 MPa m1/2, much larger than 1.4 MPa m1/2 for binary Laves phase Cr2Nb. Meanwhile, the fracture toughness of Cr2Nb–xTi (x = 20, 30, 40) alloys increases with increasing Ti content and reaches 10.6 MPa m1/2 in Cr2Nb–40Ti alloy. The eutectic microstructure and addition of Ti in Cr2Nb are found to be effective in toughening Laves phase-based alloys.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51074127 and 51104120) and the SRF for ROCS, SEM.

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Authors and Affiliations

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

    Yun-Long Xue, Shuang-Ming Li, Hong Zhong & Heng-Zhi Fu

  2. Northwest Institute for Non-Ferrous Metal Research, Xi’an, 710016, China

    Lai-Ping Li

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  1. Yun-Long Xue
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  2. Shuang-Ming Li
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  3. Hong Zhong
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  4. Lai-Ping Li
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  5. Heng-Zhi Fu
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Correspondence to Shuang-Ming Li.

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Xue, YL., Li, SM., Zhong, H. et al. Microstructure Characterization and Fracture Toughness of Laves Phase-Based Cr–Nb–Ti Alloys. Acta Metall. Sin. (Engl. Lett.) 28, 514–520 (2015). https://doi.org/10.1007/s40195-015-0227-7

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  • DOI: https://doi.org/10.1007/s40195-015-0227-7

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