Abstract
The effect of post-irradiation annealing on the microstructures and mechanical properties of V-4Cr-4Ti alloys was studied. Helium-hydrogen-irradiated sequentially V-4Cr-4Ti alloys at room temperature (RT) were undergone post-irradiation annealing at 450 °C over periods of up to 30 h. These samples were carried out by high-resolution transmission electron microscopy (HRTEM) observation and nanoindentation test. With the holding time, large amounts of point defects produced during irradiation at RT accumulated into large dislocation loops and then dislocation nets which promoted the irradiation hardening. Meanwhile, bubbles appeared. As annealing time extended, these bubbles grew up and merged, and finally broke up. In the process, the size of bubbles increased and the number density decreased. Microstructural changes due to post-irradiation annealing corresponded to the change of hardening. Dislocations and bubbles are co-contributed to irradiation hardening. With the holding time up to 30 h, the recovery of hardening is not obvious. The phenomenon was discussed by dispersed barrier hardening model and Friedel-Kroupa-Hirsch relationship.
Highlights
Vanadium-based alloys have been developed for possible use in the structure of fusion power reactors because of their potential for low activation and their attractive high-temperature properties [1]
V-4Cr-4Ti alloy was irradiated He and H ion irradiation sequentially to a dose of 1017ions/cm2 at room temperature (RT) and carried out post-irradiation annealing at 450 °C for 10–30 h to evaluate the evolution of microstructure and hardening
high-resolution transmission electron microscopy (HRTEM) observations showed that dislocation lines left in the matrix
Summary
Vanadium-based alloys have been developed for possible use in the structure of fusion power reactors because of their potential for low activation and their attractive high-temperature properties [1]. * Correspondence: jsn@qlu.edu.cn School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China words, how responsible the dislocation loops/nets and bubbles for the irradiation hardening. This study conducted experiments to determine the post-irradiation annealing effect on the microstructures and mechanical properties of He and H-irradiated V-4Cr4Ti alloys. The microstructures of irradiated annealed samples are dominated by bubbles and dislocation loops/nets [20].
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