Effect on properties of alloy DZ4 irradiated by high intensity pulsed ion beam

Surface irradiation of refractory alloy DZ4 is now realized by using high intensity pulsed ion beam(HIPIB) containing Cn+ and H+, where the accelerating voltage, pulse duration and current density were fixed at 250 kV, 70 ns and 160 A/cm2 respectively, while the treating pulses were chosen as 2, 5, 10 and 15 times. The morphologies of the samples are analyzed by SEM. Craters appear on the surface of DZ4 alloy after a few radiations, and disappear when irradiated for more times. According to cross-section SEM image, there is a remelting layer with depth of 1~2 mm on the surface of the irradiated samples, and the grains of the remelting layer are refined and the grain boundaries are blurry. The results of electron probe microanalysis demonstrate that there are plenty of Cr and Mo around the