The orthopedic application of Zn is limited owing to the poor strength and low plasticity. In this study, a novel strategy by combining rapid solidification obtained by selective laser melting (SLM) and alloying with Mg was proposed to improve the mechanical properties of Zn. The microstructures, mechanical properties, as well as in vitro cytocompatibility of SLM processed Zn-xMg (x = 0–4 wt%) were studied systematically. Results shown that SLM processed Zn-xMg alloys consisted of fine equiaxed α-Zn grains with homogeneously precipitated Mg₂Zn₁₁ along grain boundaries. More importantly, the grains size of α-Zn was decreased from 104.4 ± 30.4 µm to 4.9 ± 1.4 µm with Mg increasing. And Mg mainly dissolved in α-Zn developing into supersaturated solid solution due to rapid solidification effect. As a consequence, the ultimate tensile strength and elongation were enhanced by 361% and 423%, respectively, with Mg containing up to 3 wt%. Meanwhile, alloying with Mg enhanced the corrosion resistance of Zn, with the degradation rate decreasing from 0.18 ± 0.03 mm year⁻¹ to 0.10 ± 0.04 mm year⁻¹. Furthermore, SLM processed Zn-xMg exhibited good biocompatibility. This research suggested that SLM processed Zn-3Mg alloy was a potential biomaterial for orthopedic applications.

由于强度低和可塑性低，Zn的整形外科应用受到限制。在这项研究中，提出了一种通过结合选择性激光熔化（SLM）和与镁合金化的快速凝固方法来改善锌的机械性能的新策略。系统研究了SLM处理的Zn- x Mg（x  = 0-4 wt％）的微观结构，力学性能以及体外细胞相容性。结果表明，经SLM处理的Zn- x Mg合金由细小的等轴α-Zn晶粒组成，并均匀析出Mg ₂ Zn ₁₁沿晶界。更重要的是，随着Mg的增加，α-Zn的晶粒尺寸从104.4±30.4 µm减小到4.9±1.4 µm。镁主要溶解在α-Zn中，由于快速凝固作用而发展成过饱和固溶体。结果，Mg含量最高为3 wt％时，极限抗拉强度和伸长率分别提高了361％和423％。同时，与Mg合金化提高了Zn的耐腐蚀性，其降解速率从0.18±0.03mm年^-1降低至0.10±0.04mm年^-1。此外，经SLM处理的Zn- x Mg表现出良好的生物相容性。这项研究表明，经SLM处理的Zn-3Mg合金是骨科应用的潜在生物材料。