Abstract
Specimens of Pd80Ni20 alloy were irradiated in air with 70, 80, 90, and 100 laser shots using a Q-switched Nd-YAG laser of 1064 nm wavelength with pulse duration 10 ns, energy 50 mJ, and repetition rate 10 Hz. Surface morphology of the laser-irradiated specimens was studied with the help of a scanning electron microscope. It includes wave-like structures or ripples, dips, ridges, microcones, flakes, and fissures, etc. The X-ray diffraction patterns of un-irradiated and irradiated specimens were analyzed using the Williamson–Hall method to evaluate crystallite size and microstrain. Texture coefficient was determined by Harris analysis. The peak intensity of (111), (200), (220), (311), and (222) planes increases linearly with laser shots, which shows that the concentration of point defects (i.e., vacancies) is progressively decreased on increasing the number of laser shots due to the annealing processes. Surface hardness was measured using a Vickers hardness tester. The average surface hardness of the specimens initially decreases on irradiation with 70 laser shots and later on increases linearly with increase in laser shots up to 100. An inverse Hall-Petch relationship is observed in the crystallite size range 19–27 nm. As crystallite size decreases from 27 to 19 nm, volume fraction of amorphous phase increases progressively. The amorphous phase being softer than crystalline phase due to increased atomic spacing leads to reduction in surface hardness of the material.
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Highlights for Review
• Pd80Ni20 specimens were irradiated with 70, 80, 90, and100 infrared laser shots
• Texture coefficient of Pd80Ni20 alloy depends on the number of laser shots
• Surface roughness decreases from 2.8 to 0.9 μm with the increase in laser shots
• Surface hardness increases from 165 to193 HV with the increase in laser shots
• Inverse Hall–Petch relation is observed in the crystallite size range 19–27 nm
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Butt, M.Z., Javed, A., Khaliq, M.W. et al. Impact of 1064 nm–10 ns pulsed laser on the surface morphology, structure, and hardness of Pd80Ni20 alloy. Int J Adv Manuf Technol 90, 1857–1869 (2017). https://doi.org/10.1007/s00170-016-9526-z
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DOI: https://doi.org/10.1007/s00170-016-9526-z