Pulsed laser ablation of Ni in vacuum and atmosphere at various fluences. (July 2015) - Bashir, Shazia
Abstract Mechanisms of Ni ablation in vacuum and atmosphere at various fluences ranging from to are studied by using a KrF excimer laser. The formation of various conical microstructures, ripples, large-sized irregular shaped cavities and pits is found. It is shown that no new phases are formed in the case of Ni ablation in vacuum, while new phases of nitrides and nitro-oxides appear in the environment. The microhardness analysis of targets irradiated in vacuum shows a decreasing trend with increasing fluence, whereas in the case of the environment, a monotonic increase in hardness with increasing fluence is observed.