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Nano-precipitate and its aging behavior in a B2-NiAl strengthened ferritic ODS alloy

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Abstract

The effect of aging on a mechanical alloyed (MA) ferritic oxide dispersion strengthened (ODS) alloy was investigated focusing on the B2-NiAl nano-precipitates. The matrix of the alloy is decorated with a high volume fraction of B2-NiAl precipitates and dispersed nano-oxide particles. Due to the coarsening effect of Al on oxides and the changed Zener drag effect on grain growth, the bimodal grain structure was formed. With the extension of the aging time, the size of nano-precipitate increases and its morphology changed from near spherical to rodlike. The temporal evolution of nano-precipitates upon aging treatment is consistent with the modified Lifshitz–Slyozov–Wangner (LSW) theory. In addition, the quantitative calculation reveals the weakening effect caused by nano-precipitates coarsening during aging is the main reason for the decrease in alloy strength.

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Acknowledgements

This work is financially supported by National Natural Science Foundation of China (51974029, 52074032, 51604240), Natural Science Foundation of Hunan Province (2019JJ50585), Natural Science and Technology Major Project (2017-VI-0014-0086), Fundamental Research Funds for the Central Universities (FRF-AT-19-013) and 111 project (B170003).

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Authors and Affiliations

  1. Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Shengxi Wang, Lin Zhang, Yan Chen, Xiaowei Chen & Xuanhui Qu

  2. School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China

    Ye Liu

  3. State Key Laboratory of Long-Life High Temperature Materials, Dong Fang Turbine Co., Ltd, Deyang, 61800, Sichuan, China

    Zhenhuan Gao

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  1. Shengxi Wang
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Correspondence to Lin Zhang or Ye Liu.

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Wang, S., Zhang, L., Liu, Y. et al. Nano-precipitate and its aging behavior in a B2-NiAl strengthened ferritic ODS alloy. J Mater Sci 56, 19663–19673 (2021). https://doi.org/10.1007/s10853-021-06538-1

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