A peritectic phase refines the microstructure and enhances Zn implants
A peritectic phase refines the microstructure and enhances Zn implants
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包晶相细化微观结构并增强锌植入物
DOI：
10.1016/j.jmrt.2020.04.037
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发表时间：
2020-05
影响因子：
6.4
通讯作者：
Qi Fangwei
中科院分区：
文献类型：
--
作者：
Shuai Cijun;Dong Zhi;He Chongxian;Yang Wenjing;Peng Shuping;Yang Youwen;Qi Fangwei
锌具有良好的生物降解性和生物相容性，是一种潜在的骨科植入材料。本研究采用激光粉末床熔融法制备了锌基骨种植体，并在其中引入了铜元素。特别地，Cu在熔化期间溶解在Zn液体中，并且随后在冷却期间在前进的液-固界面之前分配。在此条件下，一个包晶相，CuZn 5，沉淀优先，并作为异质形核网站。它与周围的液相反应生成细化的η-Zn晶粒，导致晶粒细化和沉淀强化。结果，压缩屈服强度、极限拉伸强度和硬度分别增加到165 ± 7 MPa、223 ± 4 MPa和97 ± 2 HV。此外，Zn-Cu合金的抗菌活性比Zn合金有很大提高，释放的Cu离子可破坏细胞膜结构，抑制质粒/DNA的复制。此外，它还表现出良好的生物相容性以及适当的降解速率。Zn-Cu合金是一种很有前途的骨植入材料。
Zn has currently drawn great attention as potential orthopedic implant material due to its desirable biodegradability and good biocompatibility. In present study, Cu was introduced into Zn bone implant fabricated by laser powder bed fusion. Particularly, Cu dissolved in Zn liquid during melting, and subsequently partitioned ahead of the advancing liquid-solid interface during cooling. In this condition, a peritectic phase, ɛ-CuZn5, precipitated priority and acted as heterogeneous nucleation sites. It reacted with surrounding liquid phase to generate refined η-Zn grains, resulting in grain refinement and precipitation strengthening. As a result, the compressive yield strength, ultimate tensile strength and hardness were increased to 165 ± 7 MPa, 223 ± 4 MPa and 97 ± 2 HV, respectively. Moreover, Zn-Cu alloy exhibited a greatly enhanced antibacterial activity as compared with Zn, as the released Cu ion could damage cell membrane structure and inhibit plasmid/DNA replication. Furthermore, it also presented favorable biocompatibility as well as suitable degradation rate. It was demonstrated that Zn-Cu alloy may be a promising candidate as bone implant.
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