Surface topography and structure of laser-treated high-purity zinc

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Abstract
We irradiated 99.995% pure zinc specimens in a vacuum with 50, 60, 70, 80, 90, and 100 nanosecond visible laser shots. SEM images of irradiated specimens were analyzed using Gwyddion 2.29 software. The average length of surface microcones formed at the periphery of the ablated area increases linearly from 30 to 56 μ m on the increase in number of laser shots from 50 to 100. Nano-size droplets (16–40 nm) are formed in the vicinity of ablated area; the greater the number of droplets, the smaller is their mean diameter. XRD patterns of un-irradiated and irradiated specimens reveal changes in the intensity of diffracted peaks on laser irradiation. Harris analysis was done to determine texture coefficient; crystallographic planes (002) and (004) get preferentially oriented on laser irradiation. Williamson–Hall analysis was carried out to evaluate the structural parameters, namely crystallite size, dislocation line density, and microstrain.

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