在可生物降解的Mg-稀土合金中的强度-柔性协同作用,通过多方向造加工
Faseeulla Khan Mohammad1, Uzwalkiran Rokkala2, Sohail M A K Mohammed3
1Department of Mechanical Engineering, College of Engineering, King Faisal University, Al-Ahsa 31982, Saudi Arabia.
Journal of functional biomaterials
|October 28, 2025
概括
多向造 (MDF) 增强了可生物降解的合金,提高了强度和柔性. 虽然腐蚀增加,但它仍然适合生物吸收植入物,显示出医疗器械的有希望的权衡.
科学领域:
- 材料科学 材料科学 材料科学
- 生物材料工程 生物材料工程
- 金工业是金工业的一个方面.
背景情况:
- 可生物降解的 (Mg) 合金由于其机械性能和生物相容性,对生物医学植入物具有前景.
- 严重的塑性变形 (SPD) 技术可以改进谷物结构并增强机械性能,但往往以柔性为代价.
- 了解微观结构,机械性能和腐蚀行为之间的相互作用对于开发先进的Mg合金至关重要.
研究的目的:
- 研究由多方向造 (MDF) 处理的Mg-Zn-Nd-Gd合金的微结构演变,机械性能和腐蚀行为.
- 评估颗粒大小和质感对合金强度和耐腐蚀性的影响.
- 评估MDF加工的Mg合金对于生物吸收植入物应用的适用性.
主要方法:
- 多向造 (MDF) 用于加工可生物降解的Mg-Zn-Nd-Gd合金.
- 电子背散衍射 (EBSD) 用于分析微观结构变化,包括粒径大小和质地.
- 在汉克平衡盐溶液 (HBSS) 中进行了机械测试 (UTS,YS,延长) 和电化学腐蚀测试.
主要成果:
- 经过不连续动态再结晶 (DDRX) 的过程,MDF加工显著提炼了从118μm的粒度到30μm的粒度.
- 观察到强度 (UTS ~59%,YS ~90%) 和柔性 (延长 ~44%) 的协同增强,归因于谷物精炼,沉物增强和质地减弱.
- 由于LAGB和Mg7Zn3颗粒等微观结构特征,腐蚀率从0.1165毫米/年增加到0.2499毫米/年,但在可生物吸收植入物中保持在可接受的范围内.
结论:
- MDF加工有效地提高了Mg-稀土合金中的强度-柔性协同作用.
- 经过加工的合金在提高机械性能和临床上可接受的降解率之间呈现出良好的平衡.
- 这项研究将MDF作为下一代可生物降解的基于Mg的生物医学植入物的有希望的加工途径.
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