Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Enhanced mechanical properties and interface structure characterization of W-La2O3 alloy designed by an innovative combustion-based approach

  • Chen, Pengqi (School of Materials Science and Engineering, Hefei University of Technology) ;
  • Xu, Xian (School of Materials Science and Engineering, Hefei University of Technology) ;
  • Wei, Bangzheng (School of Materials Science and Engineering, Hefei University of Technology) ;
  • Chen, Jiayu (AECC Commercial Aircraft Engine Co, LTD.) ;
  • Qin, Yongqiang (Research Centre for Powder Metallurgy Engineering and Technology of Anhui Province) ;
  • Cheng, Jigui (School of Materials Science and Engineering, Hefei University of Technology)
  • Received : 2020.07.20
  • Accepted : 2020.11.01
  • Published : 2021.05.25
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Abstract

Oxide dispersion strengthening (ODS) tungsten alloys are highly desirable in irradiation applications. However, how to improve the properties of ODS-tungsten alloys efficiently has been worth studying for a long time. Here we report a nanostructuring approach that achieves W-La2O3 alloy with a high level of flexural strength and Vickers hardness at room temperature, which have the maximum value of 581 MPa and 703 Hv, respectively. This method named solution combustion synthesis (SCS) can generate 30 nm coating structures W-La2O3 composite powders by using Keggin-type structural polyoxometalates as raw materials in a fast and low-cost process. The composite powder can be fabricated to W-La2O3 alloy with an optimal microstructure of submicrometric W grains coexisting with nanometric oxide particles in the grain interior, and a stability interface structure of grain boundaries (GBs) by forming transition zones. The method can be used to prepare new ODS alloys with excellent properties in the future.

Keywords

Acknowledgement

This work was financially supported by the Natural Science Foundation of Anhui (JZ2018AKZR0063), the program of the National Natural Science Foundation of China (51674095), the National Key Research and Development Program of China (JZ2019ZDYF0111) and the Fundamental Research Funds for the Central Universities (PA2019GDPK0044).

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