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Abstract: 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 control molten-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.

江西理工大学帅词俊等｜锌的激光增材制造：成型质量、织构以及细胞行为

本研究论文聚焦激光增材制造可降解金属锌的成型质量、织构以及细胞行为的研究。激光增材制造不仅充分实现金属粉末近净形状制造的可能性，还能精确制造出复杂结构，在骨修复领域引起了广泛关注。金属锌兼具良好的生物相容性和适中的降解速率，被认为是一种极具潜力的可降解金属。然而锌存在较低的熔点和沸点，在制备过程中容易产生蒸发产物，使激光束辐射和输入粉末层的激光能量不一致，进而降低了锌植入物的形成质量。本文采用激光增材制造技术制备金属锌，通过阐明激光工艺参数对金属锌成型质量、织构以及力学性能的影响机制，获得了制备金属锌的优化激光工艺。在优化激光工艺下，金属锌的平均硬度、机械强度和伸长率分别达到了50.2HV、127.8MPa和7.6%。此外，还分析了金属锌的降解行为和成骨性能。这项工作为选择激光工艺参数以优化锌植入物的综合性能提供了依据。