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Laser additive manufacturing of zinc:formation quality,texture,and cell behavior

Bio-Design and Manufacturing 2023年第2期6卷 103-120页

作者： Mingli Yang Liuyimei Yang Shuping Peng Fang Deng Yageng Li Youwen Yang Cijun Shuai Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341119China The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education Central South UniversityChangsha 410078China NHC Key Laboratory of Carcinogenesis School of Basic Medical ScienceCentral South UniversityChangsha 410013China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes Tongling UniversityTongling 244061China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

Laser powder bed fusion(LPBF)makes it possible for biodegradable zinc(zn)to be used to produce customized orthopedic implants.In this research,we investigate the impact of laser power and scanning speed on the development of surface quality,relative densification,and texture during LPBF of zn implants.Increasing laser power was able to decrease melt viscosity and surface tension,which improved the metallurgical bonding between adjacent tracks.Uneven and twisted tracks also became continuous and straight.Scanning speed could controlmolten-pool temperature to restrain grain natural orientation,achieving various crystal orientations and a weakened texture.Importantly,it further avoided the thermal expansion and contraction caused by excessive energy storage and accumulation in the matrix,thus reducing the generation of high-dislocation density.As a result,by selecting a reasonable laser power and scanning speed,the LPBF parts exhibited a flat surface morphology and a high density over 99.5%.Their average hardness,mechanical strength,and elongation reached 50.2 HV,127.8 MPa,and 7.6%,respectively.Additionally,the parts displayed a moderate degradation rate and excellent osteogenic properties.All these results provide a basis for selecting process parameters to optimize the comprehensive properties of LPBF-processed zn parts for biodegradable applications.

关键词： zn implants Additive manufacturing Laser powder bed fusion Formation quality Texture Osteogenic properties

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