电改变了Ti-6Al-4V的近表面微观结构,相位,组成和硬度
Mohsen Karshenas1,2, Peter W Kurtz1,2, Amandine Impergre1,2
1Department of Bioengineering, Clemson University, Clemson, South Carolina, USA.
Journal of biomedical materials research. Part A
|January 9, 2026
概括
电外科手术可能会损害的膝盖和部植入物,导致微观结构变化和硬度增加,深度高达300微米. 这种电击损伤 (ECD) 可能导致植入物脆弱和失败.
科学领域:
- 生物材料科学 生物材料科学
- 整形外科手术 整形外科手术
- 材料工程 材料工程 材料工程
背景情况:
- 整体关节整形术 (TJA) 的成功率很高,但仍然发生植入失败.
- 接触金属植入物的电术刀片的意外损伤是TJA失效的未被认可的原因.
研究的目的:
- 研究和描述由电损伤 (ECD) 引起的Ti-6Al-4V合金中的微观结构变化和机械性质变化.
- 评估ECD对植入物材料地下表面的深度影响.
主要方法:
- 在Ti-6Al-4V磁盘上引起了电损伤 (ECD).
- 使用数字光学显微镜,扫描电子显微镜,能量分散光谱和原子力显微镜进行了微结构分析.
- 在横截面样本上使用纳米印进行了深度依赖硬度的评估.
主要成果:
- 电极电阻导致长期的微观结构变化,深度高达300微米,包括马氏体转变和改变β相形态.
- 在前50微米内观察到表面化,氧化物/化物形成和叶片材料 (Si,C,Fe) 的转移.
- 在受ECD影响的地区,硬度显著增加,在130微米深处达到8.5GPa,而在大部分地区则是2.7GPa.
- 观察到表面裂,穿透几十微米.
结论:
- 电会导致Ti-6Al-4V的显著,深度依赖的地下微观结构和机械变化.
- ECD可能导致植入物表面脆化,可能会影响长期关节整形术的性能.
- 这些发现强调了在手术期间考虑电外科技术与植入物完整性相关的关键需要.
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