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经MCSTE加工的AZ31合金的腐蚀和降解行为

Khaled B Abdelfattah¹, Marwa A Abbas¹, Waleed H El-Garaihy^2,3

¹Metallurgical and Materials Engineering Department, Faculty of Petroleum and Mining Engineering, Suez University, Suez, 43512, Egypt.

Scientific reports

|February 3, 2025

概括

多通道螺旋扭转挤出增强了可生物降解的AZ31合金的性能. 30°的扭转角度显著提高了机械强度和耐腐蚀性,使其非常适合医疗植入物.

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
腐蚀科学腐蚀科学

背景情况:

可生物降解的合金对医疗植入物是有前途的,因为它们的生物相容性和可调节的降解率.
合金AZ31需要微观结构修改,以优化其在生理环境中的性能.
现有的加工方法可能无法充分提高机械完整性和耐腐蚀性,以满足对植入物应用的要求.

研究的目的:

研究多通道螺旋扭转挤出 (MCSTE) 对AZ31合金微观结构,机械性能和腐蚀行为的影响.
为了确定不同扭转角度 (30°和40°) 和加工经验对合金性能的影响.
评估MCSTE适合生产AZ31合金用于可生物降解的医疗植入物应用.

主要方法:

使用C-MCSTE路径在250°C下处理AZ31合金片,通过不同的通过和转角 (30°,40°).
微观结构分析,包括粒度大小分布,使用扫描电子显微镜与电子反射衍射进行.
在模拟体液和压缩试验中进行了电化学试验,以评估耐腐蚀性和机械性能.

主要成果:

使用30度扭转角模具进行加工,与40度模具相比,产生了更高的机械强度和耐腐蚀性.
经过4次30度过关后,观察到66%的颗粒大小减少.
最终的压力强度增加了高达31% (8次通过),与30°模具相比,与化状态相比,30°模具的腐蚀率提高了76% (8次通过).

结论:

在MCSTE工艺中,特别是在30°扭转角的模具中,可以有效地改进AZ31合金的微观结构.
MCSTE显著提高了机械性能和耐腐蚀性,这对于生物降解植入物应用至关重要.
开发的MCSTE工艺显示出制造用于医疗植入物的先进生物降解合金的工业可行性.

关键词:

MCSTE;生物降解的AZ31合金;腐蚀行为;微观结构的演变.

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