Positron Annihilation Study of Zr-2.5 wt.% Nb alloy Irradiated by Ar9+ heavy ions

[摘要] Zr-2.5 Nballoy is used as a pressure tube material in pressurized heavy water reactor (PHWR). It is one of the most critical component which decides the lifespan of the reactor. The in-reactor degrading phenomenon of prime concern is dimensional changes caused by irradiation induced creep and growth processes. The present study aims to understand the mechanism of irradiation damage by irradiating the alloy with heavy ion. Such type of irradiation study would facilitate larger damage of material in a shorter time. Zr-2.5Nb alloy samples were irradiated using 315 keV Ar9+ion for different durations. The irradiation doses were varied in the range of 3.1X1015to 4.17X1016Ar9+/cm2. SRIM calculation was carried out to evaluate damage profile in the irradiated samples. Beam based Positron Annihilation Spectroscopy (PAS) technique was used for depth profiling to characterize defect distribution in the alloys. The no. of defects generated is seen to increase with the increase in the fluence.

[发布机构] Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai; 400085, India^1;Variable Energy Cyclotron Centre, 11AF Bidhannagar, Kolkata; 700064, India^2;Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai; 400085, India^3

[效力级别] 化学

[关键词] Critical component;Damage of materials;Defect distribution;Dimensional changes;Irradiated samples;Irradiation Damage;Positron annihilation spectroscopy (PAS);Pressurized heavy water reactors