Mg-Zn-Zr (ZK60) magnesium alloy samples were prepared by selective laser melting (SLM). The processability of ZK60 prepared by SLM was thoroughly investigated via varying the laser processing parameters. Experimental results show that laser power and scan velocity played an important role in determining the quality of SLM ZK60. SLM ZK60 with minimal defects and high dimensional accuracy could be obtained at a laser power of 50 W and scanning velocity of 500–800 mm/s. The formation mechanisms of pores were also identified and illustrated thoroughly in size and shape in the transition regimes. Significantly refined grains were observed in SLM ZK60, with an average grain size (G_a) of 7.3 μm for SLM ZK60 versus 56.4 μm for cast ZK60. Besides the α-Mg phase, the Mg₇Zn₃ eutectic phase was precipitated in the α-Mg matrix in SLM ZK60, and the MgZn phase in cast ZK60. The hardness of cast ZK60 and SLM ZK60 was 0.55 and 0.78 GPa, respectively, with similar elastic modulus. SLM ZK60 exhibited a higher corrosion resistance in Hanks’ solution compared with cast ZK60 as indicated by a decrease of about 30 % in hydrogen evolution rate and of about 50 % in the corrosion current density. The SLM ZK60 fabricated in the present study exhibits a great potential for biomedical applications due to desirable mechanical properties and a reasonably low degradable rate.

Mg-Zn-Zr（ZK60）镁合金样品是通过选择性激光熔化（SLM）制备的。通过改变激光加工参数，彻底研究了SLM制备的ZK60的加工性能。实验结果表明，激光功率和扫描速度在确定SLM ZK60的质量中起着重要作用。在50 W的激光功率和500-800 mm / s的扫描速度下可以获得具有最小缺陷和高尺寸精度的SLM ZK60。还确定了孔的形成机理，并在过渡过程中对孔的大小和形状进行了详尽的说明。在SLM ZK60中观察到明显细化的晶粒，SLM ZK60的平均晶粒尺寸（G _a）为7.3μm，而铸造ZK60的平均晶粒尺寸（G _a）为56.4μm。除了α-Mg相之外，Mg ₇ Zn在SLM ZK60中的α-Mg基质中析出了_3个共晶相，在铸件ZK60中析出了MgZn相。铸造的ZK60和SLM ZK60的硬度分别为0.55和0.78 GPa，具有相似的弹性模量。与铸造ZK60相比，SLM ZK60在Hanks溶液中表现出更高的耐腐蚀性，这表明氢气放出速率降低了约30％，腐蚀电流密度降低了约50％。由于所需的机械性能和合理的低降解速率，本研究中制造的SLM ZK60在生物医学应用中显示出巨大的潜力。