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Zhou, et al.
A B

C D E

Figure 1. Morphology of pure Zn powders from different atomization methods under scanning electron microscope. (A and B) Water-
atomized coarse and fine powders. Reprinted from Additive Manufacturing, 15, Demir A G, Monguzzi Land Previtali B, Selective
Laser Melting of Pure Zn with High Density for Biodegradable Implant Manufacturing, 20-28, copyright (2016), with permission from
[6]
Elsevier . (C and D) Air-atomized pure Zn powders with different shape. Reprinted with permission from Sungkhaphaitoon P, Plookphol T,
[47]
Wisutmethangoon S, International Journal of Applied Physics and Mathematics, 2012, 2(2): 77 . (E) Nitrogen-atomized powder. Adapted
with permission from Debroy, et al., 2018 . Reprinted from Materials & Design, 155, Wen P, Voshage M, Jauer L, et al., laser additive
[48]
manufacturing of Zn metal parts for biodegradable applications: Processing, formation quality and mechanical properties, 36-45, copyright
(2018), with permission from Elsevier.
A B

Figure 2. (A) Temperature contour plots using different laser power. Adapted with permission from Yu GQ, Gu DD, Dai DH, et al., Journal
of Physics D-Applied Physics, 2016, 49(13) . (B) Solid fraction of powder layers showing the formation of spherical and irregular pores at
[56]
different scanning rates. Reprinted from influence of processing parameters on laser penetration depth and melting/remelting densification
during selective laser melting of aluminum alloy, Applied Physics A, 122(10), 2016, Yu GQ, Gu DD, Dai DH, et al., with permission of
Springer Nature Switzerland .
[57]
pool generally enlarges, which results in the enhancement of samples, as exhibited in Figure 2B. At a high scanning
of bonding ability between adjacent traces . speed, the supplied heat provided by laser is insufficient
[55]
The scanning rate determines the interaction time to melt the whole particles, which leads to incomplete
between the laser beam and powder particles, which affects bounding. In this case, the surface tension causes the
the laser energy input in the molten pool and densification melt on the surface to shrink outward, and this fluid flow

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