About this Abstract |
Meeting |
Advances in Welding and Additive Manufacturing Research 2022
|
Symposium
|
Advances in Welding and Additive Manufacturing Research 2022
|
Presentation Title |
Influence of Alloying Elements on Processing Conditions and Biodegradable Performance of Zn Alloys Fabricated by Laser Powder Bed Fusion |
Author(s) |
Aobo Liu, Yu Qin, Jiabao Dai, Peng Wen, Yufeng Zheng, Dandan Xia, Hongtao Yang |
On-Site Speaker (Planned) |
Aobo Liu |
Abstract Scope |
Zinc (Zn) based biodegradable metals are promising biomaterials for orthopedic implants due to their suitable degradation rate and favorable biocompatibility. Laser powder bed fusion (L-PBF) opens up the possibility for the accurate and efficient fabrication of medical implants with customized structures. In this work, pure Zn parts were achieved with relative density over 99.90% in a reasonable processing window by L-PBF. However, the tensile strength of pure Zn was insufficient as 130 MPa, limiting its application in load-bearing bone implants. Zn-xMg alloys (x=1,2,5) and Zn-0.7Li alloy were fabricated by L-PBF and the influence of Mg and Li elements on the formation quality, microstructure, mechanical properties, corrosion behavior, cytocompatibility and osteogenesis were systematically investigated. The relative density of Zn-xMg and Zn-0.7Li alloys was greater than 99.5% after processing optimization, but the processing window was much narrower than that of pure Zn. Tensile strength of Zn-1Mg and Zn-0.7Li alloys reached 381 MPa and 416 MPa respectively, approximately three times that of pure Zn. The in vitro corrosion rate increased with the addition of Mg, and the surface conditions greatly influenced the corrosion rate. The addition of Mg also improved the biocompatibility and osteogenesis. In summary, the presented results indicate the encouraging prospect of L-PBF processed Zn-Mg and Zn-Li alloys for future biodegradable implants. |
Proceedings Inclusion? |
Undecided |