Figure 19.
SEM images of Al surfaces fabricated by the nanosecond laser with different scan spacing. (a,b) 10 mm. (c,d) 20 mm. (e,f) 30 mm. (g,h) 50 mm. (i,j) 100 mm. (k,l) 200 mm. (Reprinted from [31] with permission from Elsevier).
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