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Weiqiang Hu, Fengming Gong, Shaocun Liu, Jing Tan, Songhua Chen, Hui Wang, and Zongqing Ma, Microstructure refinement and second phase particle regulation of Mo–Y2O3 alloys by minor TiC additive, Int. J. Miner. Metall. Mater., 29(2022), No. 11, pp. 2012-2019. https://doi.org/10.1007/s12613-022-2462-z
Cite this article as:
Weiqiang Hu, Fengming Gong, Shaocun Liu, Jing Tan, Songhua Chen, Hui Wang, and Zongqing Ma, Microstructure refinement and second phase particle regulation of Mo–Y2O3 alloys by minor TiC additive, Int. J. Miner. Metall. Mater., 29(2022), No. 11, pp. 2012-2019. https://doi.org/10.1007/s12613-022-2462-z
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Research Article

Microstructure refinement and second phase particle regulation of Mo–Y2O3 alloys by minor TiC additive

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  • Corresponding author:

    Zongqing Ma    E-mail: mzq0320@163.com

  • Received: 23 December 2021; Revised: 3 March 2022; Accepted: 3 March 2022; Available online: 4 March 2022
    Abstract
  • The oxide dispersion strengthened Mo alloys (ODS-Mo) prepared by traditional ball milling and subsequent sintering technique generally possess comparatively coarse Mo grains and large oxide particles at Mo grain boundaries (GBs), which obviously suppress the corresponding strengthening effect of oxide addition. In this work, the Y2O3 and TiC particles were simultaneously doped into Mo alloys using ball-milling and subsequent low temperature sintering. Accompanied by TiC addition, the Mo–Y2O3 grains are sharply refined from 3.12 to 1.36 μm. In particular, Y2O3 and TiC can form smaller Y–Ti–O–C quaternary phase particles (~230 nm) at Mo GBs compared to single Y2O3 particles (~420 nm), so as to these new formed Y–Ti–O–C particles can more effectively pin and hinder GBs movement. In addition to Y–Ti–O–C particles at GBs, Y2O3, TiOx, and TiCx nanoparticles (<100 nm) also exist within Mo grains, which is significantly different from traditional ODS-Mo. The appearance of TiOx phase indicates that some active Ti within TiC can adsorb oxygen impurities of Mo matrix to form a new strengthening phase, thus strengthening and purifying Mo matrix. Furthermore, the pure Mo, Mo–Y2O3, and Mo–Y2O3–TiC alloys have similar relative densities (97.4%–98.0%). More importantly, the Mo–Y2O3–TiC alloys exhibit higher hardness (HV0.2 (425 ± 25)) compared to Mo–Y2O3 alloys (HV0.2 (370 ± 25)). This work could provide a relevant strategy for the preparation of ultrafine Mo alloys by facile ball-milling.
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