Enabling High-Performance Surfaces of Biodegradable Magnesium Alloys via Femtosecond Laser Shock Peening with Ultralow Pulse Energy
Enabling High-Performance Surfaces of Biodegradable Magnesium Alloys via Femtosecond Laser Shock Peening with Ultralow Pulse Energy
复制标题
通过超低脉冲能量的飞秒激光冲击强化，实现可生物降解镁合金的高性能表面
DOI：
10.1021/acsabm.1c00826
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发表时间：
2021
影响因子：
4.7
通讯作者：
Cai, Wenjun
中科院分区：
文献类型：
--
作者：
Wang, Wenbo;Hung, Chang-Yu;Howe, Leslie;Chen, Jia;Wang, Kaiwen;Ho, Vinh X.;Lenahan, Shannon;Murayama, Mitsuhiro;Vinh, Nguyen Q.;Cai, Wenjun
镁合金在生理环境中降解速度快、耐磨性差，限制了其作为下一代可生物降解骨科植入材料的潜在用途。在这项工作中，飞秒激光冲击硬化（fs-LSP）成功地应用于同时改善WE 43镁合金在血库缓冲盐水溶液中在体温下的表面机械，腐蚀和摩擦腐蚀性能。具体而言，WE 43镁合金表面处理的fs-LSP与超低脉冲能量进行了研究，在不同的功率密度，约束介质，和吸收材料。结果发现，黑色胶带和石英层的组合在28 GW/cm 2的功率密度下给出了最佳的喷丸效果，这同时强化了表面并降低了腐蚀动力学。此外，在摩擦腐蚀过程中，在fs-LSP处理的WE 43表面观察到快速的自再钝化，在机械载荷下具有持续的耐腐蚀性，这对承重植入物的可靠性至关重要。最后，基于透射电镜分析和有限元模拟结果，讨论了飞秒激光冲击后WE 43合金亚表面组织的演变和残余应力的发展。
The fast degradation rate and poor wear resistance of magnesium (Mg) alloys in physiological environments have limited their potential usage as next-generation biodegradable orthopedic implant materials. In this work, femtosecond laser shock peening (fs-LSP) was successfully applied to simultaneously improve the surface mechanical, corrosion, and tribocorrosion properties of WE43 Mg alloys in blood bank buffered saline solution at body temperature. Specifically, the treated surfaces of WE43 Mg alloys via fs-LSP with ultralow pulse energy were investigated under different power densities, confining mediums, and absorbent materials. It was found that the combination of a black tape and a quartz layer gave the optimum peening effect under a power density of 28 GW/cm2, which simultaneously strengthened the surface and reduced the corrosion kinetics. In addition, a rapid self-repassivation was observed in fs-LSP-treated WE43 surfaces during tribocorrosion, promising sustained corrosion resistance under mechanical loading, critical to the reliability of load-bearing implants. Finally, the subsurface microstructural evolution and residual stress development in WE43 after fs-LSP were discussed based on the results from transmission electron microscopy analysis and finite element simulations.