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Doping N/O Impurities into a MoNbTiWZr Refractory Multi-Principal Element Alloy and the Strengthening Mechanism

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Abstract

A MoNbTiWZr refractory multi-principal element alloy with N and O impurities was sintered by mechanical alloying (MA) followed by the hot-press sintering (HPS). The results demonstrated that the as-sintered samples were composed of two homogeneous body-centered cubic (BCC1 plus BCC2) structural phases with a small quantity of face-centered cubic (FCC) (Zr,Ti)O oxide inclusions. Subsequently, the alloy was sintered at 1500 °C for 45 min to give a BCC phase with an average grain size of 7.27 μm and oxide inclusions of approximately 0.86 μm, and the resulting material exhibited a remarkable microhardness of 634 HV, compressive yield strength of 2660 MPa and plastic strain of 2.5% at ambient temperature. The superior mechanical properties of the as-prepared MoNbTiWZr were principally attributed to interstitial solid solution strengthening and grain boundary strengthening. Furthermore, the large difference in the yield strength between the experimental and theoretical values revealed that excessive oxides significantly impaired the contribution of precipitation strengthening to the yield strength. The synergistic effect of the various strengthening mechanisms can be optimized by controlling the size and volume fraction of the oxide precipitates to below 1 μm and 7%, respectively.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 51805069), and also supported by the Fundamental Research Funds for the Central Universities (Grant No. DUT20GF115).

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Authors and Affiliations

  1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116085, People’s Republic of China

    Bojun Zhao, Guoqing Chen, Shasha Lv, Xuesong Fu & Wenlong Zhou

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Zhao, B., Chen, G., Lv, S. et al. Doping N/O Impurities into a MoNbTiWZr Refractory Multi-Principal Element Alloy and the Strengthening Mechanism. J. of Materi Eng and Perform 30, 9359–9369 (2021). https://doi.org/10.1007/s11665-021-06093-5

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