Selective laser melting of Zn-Ag alloys for bone repair: microstructure, mechanical properties and degradation behaviour
Selective laser melting of Zn-Ag alloys for bone repair: microstructure, mechanical properties and degradation behaviour
复制标题
用于骨修复的锌银合金的选择性激光熔化：微观结构、机械性能和降解行为
DOI：
10.1080/17452759.2018.1458991
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发表时间：
2018-01-01
影响因子：
10.6
通讯作者：
Zhang, Yanru
中科院分区：
文献类型：
--
作者：
Shuai, Cijun;Xue, Lianfeng;Zhang, Yanru
Zn具有良好的生物降解性和生物相容性，但其强度和硬度不足以用于骨植入。在这项研究中，将Ag引入到Zn中，通过选择性激光熔化来提高机械性能。结果表明，Ag溶解在Zn中，在凝固过程中在前进的固/液界面前产生组织过冷，使更多的成核事件发生，从而细化晶粒。当Ag含量超过其在Zn中的固溶度时，形成AgZn3相，该相作为Zn晶粒的活性成核位点，进一步细化晶粒。晶粒的细化有效地阻碍了塑性变形和位错。结果，抗压强度和硬度分别提高了约100%和116%。当Ag含量继续增加并变得过量时，AgZn3相迅速长大，使晶粒粗化。因此，机械性能略有下降。这些结果表明锌银合金是潜在的植入生物材料。
Zn possesses good biodegradability and biocompatibility, but its strength and hardness are insufficient for bone implants. In this study, Ag was introduced into Zn to improve the mechanical properties by selective laser melting. The results showed that Ag was dissolved in Zn, which generated constitutional undercooling in front of the advancing solid/liquid interface during solidification, making more nucleation events occur and thus refining the grains. When Ag content exceeded its solid solubility in Zn, AgZn3 phase is formed, which acted as active nucleation sites for Zn grains, further refining the grains. The refinement of the grains effectively hindered the plastic deformation and dislocation. As a result, the compressive strength and hardness were improved by about 100% and 116%, respectively. When Ag content continued increasing and became excessive, AgZn3 phase grew rapidly, coarsening the grains. Accordingly, the mechanical properties slightly decreased. These results demonstrated that the Zn-Ag alloys are potential implant biomaterials.