添加剂制造的Ti6Al4V的腐蚀疲劳
William W Hogg1, Mueed Jamal1, Nathaniel W Zuckschwerdt1
1W. M. Keck Biomedical Materials Research Lab, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, United States.
Journal of the mechanical behavior of biomedical materials
|December 3, 2025
概括
添加制造 (AM) 的Ti6Al4V植入物显示较低的疲劳寿命由于多孔性. 热静态压力 (HIPing) 提高了疲劳性能,但并不能消除生理环境中的腐蚀疲劳风险.
科学领域:
- 生物材料工程 生物材料工程
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
背景情况:
- 增材制造 (AM) 能够实现具有复杂几何形状的针对患者的植入物.
- 由于固有的多孔性,AM部件,特别是Ti6Al4V,面临疲劳失败的挑战.
- 由于其机械和生物特性,Ti6Al4V是骨科和牙科植入物的首选材料.
研究的目的:
- 为了研究激光粉床融合 (LPBF) 的高周期旋转曲疲劳行为,处理了Ti6Al4V.
- 为了比较加工和热同静压 (HIPed) 的AM Ti6Al4V与造的Ti6Al4V的疲劳性能.
- 为了评估沉浸在杜尔贝科的修饰介质 (DMEM) 对疲劳性能的影响.
主要方法:
- 对Ti6Al4V样品进行高周期旋转曲疲劳测试.
- 作为加工,HIPed和造Ti6Al4V的疲劳行为进行比较.
- 断层学和能量分散光谱学 (EDS) 用于缺陷分析.
- 在DMEM中进行疲劳测试,以模拟生理条件.
主要成果:
- 与造和HIPed样品相比,经过加工的AM Ti6Al4V具有更高的压力强度,但疲劳耐力极限 (10^7周期) 显著较低.
- 作为加工样本的孔隙缺陷是疲劳裂开始的主要原因,DMEM浸泡的影响最小.
- 造和HIPed Ti6Al4V样本显示对腐蚀疲劳的敏感性,耐力极限分别降低了9%和6%.
结论:
- 孔隙性是限制AM Ti6Al4V植入物的疲劳性能的一个关键因素.
- 在模拟生理环境中,HIP增强了耐疲劳性,但并不能完全缓解腐蚀疲劳问题.
- 在现场对腐蚀疲劳的评估对于评估增材制造的承载植入物可靠性至关重要.
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