J. Mater. Sci. Technol. ›› 2025, Vol. 212: 312-320.DOI: 10.1016/j.jmst.2024.05.074

• Research Article • Previous Articles    

The effect of chemical ordering and coherent nanoprecipitates on bubble evolution in binary-phase vanadium alloys after He ion irradiation

Xing Liua, Liyu Haoa, Shangkun Shena, Shiwei Wanga, Jian Zhangb, Kunjie Yangc, Tongde Shend, Jin Lie,*, Zefeng Wua,*, Engang Fua,*   

  1. aState Key Laboratory of Nuclear Physics and Technology, Department of Technical Physics, School of Physics, Peking University, Beijing 100871, PR China;
    bCollege of Energy, Xiamen University, Xiamen 361005, PR China;
    cCollege of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai 264005, PR China;
    dClean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;
    eInstitute of Special Environments Physical Sciences, Harbin Institute of Technology, Shenzhen 518055, PR China
  • Received:2024-03-16 Revised:2024-05-10 Accepted:2024-05-18 Published:2025-03-20 Online:2025-03-14
  • Contact: *E-mail addresses: lijin2019@hit.edu.cn (J. Li), zfwul@pku.edu.cn (Z.F. Wu), efu@pku.edu.cn (E.G. Fu)

Abstract: This study reports the response of helium (He) ion irradiation on binary-phase structured alloy V34 Ti25 Cr10 Ni30 Pd1. The alloy consists of a VCr matrix with nano-sized TiNi precipitates and a B2 TiNi matrix with nano-sized VCr precipitates. VCr is chemical-disordered and TiNi has a B2-ordered structure. The alloy was subjected to 400 keV He ion irradiation with a fluence of 1 × 1017 ions c m-2 at 450 ℃. The results show He bubbles within the chemical-disordered VCr matrix exhibit a near-spherical shape with a smaller size and higher density compared to that in chemical-ordered TiNi phase with a larger size, lower density, and faceted shape. This indicates the chemical-disordered VCr phase effectively suppresses He accumulation compared to the B2-ordered TiNi phase, emphasizing the dominance of chemical struc-tures in He bubble formation. The calculation of density functional theory (DFT) shows that Ti and Ni have lower vacancy formation energy than that of V and Cr, respectively, which results in the increased vacancy production in TiNi. Consequently, He bubbles in TiNi have a larger bubble size consistent with experimental observations of radiation-induced Ni segregation. These findings elucidate the roles of or-dered and disordered chemical structures in He bubble evolution, offering insights for the development of gas ion irradiation-resistant materials.

Key words: Multicomponent alloy, He bubble, Disordered chemical structures, Nanoprecipitates