Fe-30Mn可降解金属的激光原位合金化及其生物学研究

In-Situ Laser Alloying of Fe-30Mn Biodegradable Metal and Its Biological Research

摘要:

利用激光束粉末床熔融（PBF-LB）原位合金化制备了块状和Gyroid多孔Fe-30Mn合金，并探讨了不同打印参数对试样性能的影响。结果表明，打印过程中激光能量密度较低会导致铁、锰元素混合不均匀，导致材料力学性能下降；激光能量密度过高则会使锰元素挥发，造成合金成分不符合预期。通过优化激光参数，可获得致密度高、铁锰元素分布均匀的试样，其抗拉强度达到644.67 MPa，延伸率达到21.61%，在模拟体液中的腐蚀速率为0.042 mm/a。此外，所得Gyroid多孔支架的孔隙率为49.84%，0.2%应变屈服强度为66.11 MPa，20%应变下的压缩强度为170.76 MPa，弹性模量为6.41 GPa。间接细胞毒性试验和细胞黏附试验结果表明，该材料具有良好的生物相容性。综上所述，本研究使用PBF-LB原位合金化制备的Fe-30Mn合金具有作为可降解人骨植入材料的应用前景。

Abstract:

Block and Gyroid scaffold Fe-30Mn alloys were prepared by powder bed fusion with laser beam (PBF-LB) and in-situ alloying, and the effects of different printing parameters on the performance of specimens were studied. Results show that insufficient laser energy input during printing leads to inhomogeneous mixing of iron and manganese, which degrades the properties of the alloy. Excessively high energy input can cause manganese to vaporize, yielding a composition that deviates from the target. With optimized laser parameters, block specimens exhibiting a uniform Fe/Mn distribution can be obtained with an ultimate tensile strength of 644.67 MPa, an elongation of 21.61%, and a corrosion rate of 0.042 mm/a in simulated body fluid. Moreover, the resulting porous scaffold shows a porosity of 49.84%, a yield strength (0.2% offset) of 66.11 MPa, a compressive strength at 20% strain of 170.76 MPa, and an elastic modulus of 6.41 GPa. The results of indirect toxicity tests and cell adhesion tests show that the alloys have good biocompatibility. In conclusion, the Fe-30Mn alloy prepared by PBF-LB in-situ alloying holds promise for biodegradable human bone implants.