Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (10): 100602-100602.doi: 10.11889/j.0253-3219.2018.hjs.41.100602

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Fabrication of CuAlTiWV high entropy alloy film and its helium damage induced by helium co-deposition and annealing

HE Yunpeng1, LAO Yuanxia1, SUN Sen1, NIU Wenxiao1, QIU Nan1, WANG Yuan1,2   

  1. 1 Key Laboratory of Radiation Physics and Technology, Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China;
    2 Key Laboratory of Nuclear Materials and Safety Evaluation, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2018-02-02 Revised:2018-07-14 Online:2018-10-10 Published:2018-10-16
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11775150, No.11505121), Open Subject of Key Laboratory for Nuclear Materials and Safety Assessment, Chinese Academy of Sciences (No.2017NMSAKF02)

Abstract: [Background] Currently, high entropy alloys (HEAs) have attracted increasing interest as structural materials for the development of fusion and Generation-fission reactors due to their high strength and ductility Ⅳ improved fracture toughness, retarded energy dissipation, and suppressed damage accumulation. The accumulation of helium may result in degradation of structural material properties, and affecting the service and safety of the reactor.[Purpose] This study aims to investigate the responses of CuAlTiWV high entropy alloy thin films to helium induced and annealing.[Methods] Helium atoms were introduced in CuAlTiWV high entropy alloy thin films by magnetron sputtering in He/Ar mixed atmosphere. The microstructure and phase composition of the films were characterized by field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) respectively. The bond strength and failure mode of the films were confirmed by scratch adhesion test and FESEM.[Results] The microstructure of the CuAlTiWV high entropy alloys without helium infusion and annealing possesses body centered cubic phase and intermetallic compound phase with nano-sized particles diffusely distributed in the amorphous phase matrix. The phase structure of the CuAlTiWV high entropy allay remains stable with helium introduced and annealing whilst helium may change the microstructure and morphology of the films, hence reduce the adhesion properties and modify the failure pattern in scratch test.[Conclusion] This study provides a useful reference for further evaluation of the radiation resistance properties of HEAs and research of HEAs as structural materials for new generation fusion reactors.

Key words: High entropy alloys, Helium, Phase structure, Annealing, Failure pattern

CLC Number: 

  • TL62+7