Recently, the Materials Center of the Institute of Modern Physics, Chinese Academy of Sciences and the Institute of Materials of Beijing Institute of Nonferrous Metals have made progress in the research on the performance mechanism of vanadium alloys with radiation resistance. Related research results are published on Nuclear Fusion. The implementation of
nuclear fusion is expected to provide the ultimate solution for human energy problems, and the development of controllable nuclear fusion urgently needs breakthroughs in multiple technical fields. Among them, material issues are the key issues in the development of controlled nuclear fusion. Vanadium alloys have become an important candidate material for advanced cladding of nuclear fusion reactors with excellent high temperature strength, low activation and compatibility with liquid proliferators. Their radiation resistance is the focus of attention at present.
Relying on the Institute of Modern Physics Lanzhou Heavy Ion Accelerator (HIRFL) medium energy irradiation terminal (SFC-T1) to carry out research on the irradiation effect of vanadium alloys. This study carried out different degrees of cold processing on vanadium alloy and subsequent high-temperature annealing treatment to regulate dislocations. Researchers conducted a systematic study on the radiation resistance of vanadium alloys based on the three factors of grains, dislocation lines and nano-caves. At the same time, the effects of different initial microstructures on radiation defects were analyzed, and the effects of the coccyx strength of the initial microstructure on the irradiation hardening of the material were quantified.
study found that the high-density dislocation lines introduced in the material by the cold processing and annealing process can reduce the size of the irradiation dislocation ring, thereby improving the material's radiation hardening ability. On the other hand, the influence trend of different size dislocation lines introduced by cold rolling process and high-temperature annealing on radiation hardening is significantly different. In addition, high-density nano-cave (1.3 nm) can significantly improve the radiation hardening ability of vanadium alloys.
This study explores ways to enhance the radiation resistance of vanadium alloys outside the alloying process, providing a basic basis for improving the radiation damage theory and optimizing the radiation resistance of vanadium alloys. The research work has been supported by the National Natural Science Foundation of China.
Effect of high-density nano-cavities on radiation hardening (Han Xuxiao/photo)
Source: Institute of Modern Physics, Chinese Academy of Sciences
