Irradiation Effects Of Tungsten-Potassium Alloy Under 5 Mev Proton

Large-size tungsten-potassium (WK) alloy was prepared by powder metallurgy and deformation processing technology. Spark plasma sintering (SPS) and rolling at high temperatures were used to develop this kilogramscale WK ingot. In order to probe the irradiation-induced lattice defects in WK, proton irradiation with energy of 5 MeV and fluence rate of 1.11 x 10(16) ion/cm(2)/h was conducted to produce step-wise displacement damage at different temperatures. Irradiation-induced dislocation loops were detected, and the size and density of dislocation loops changed progressively at different irradiation conditions. The average size of loops increased while the loop densities substantially decreased as irradiation temperature went up. With increasing the displacement damage, the loop size kept increasing slowly, while the density increased gradually. Compared with displacement damage, the evolution of dislocation loops was more sensitive to temperature. It was possibly due to the sinks in WK, such as the potassium bubble and the implanted hydrogen, altering interstitial tungsten atoms' diffusion.