使用高压扭转加工的Zn-Mg合金和混合物的微结构演变和腐蚀行为
Ayoub Tanji1, Hendra Hermawan1, Carl J Boehlert2
1Department of Mining, Metallurgical and Materials Engineering, Laval University, Quebec City, QC G1V 0A6, Canada.
Materials (Basel, Switzerland)
|January 11, 2024
概括
严重的塑料变形加工提高了- (Zn-Mg) 合金和混合物用于可生物降解植入物的耐腐蚀性. 更多的加工转换通过形成金属间相来提高阻力.
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:
- (Zn) 和 (Mg) 合金正在作为生物降解的植入物材料进行研究.
- 提高Zn-Mg合金的耐腐蚀性对于其临床应用至关重要.
- 严重的塑性变形 (SPD) 处理提供了一个修改合金微结构和性能的途径.
研究的目的:
- 为了比较SPD处理的造Zn-Mg合金及其混合对应的腐蚀行为.
- 为了研究高压扭转 (HPT) 加工回转和Mg含量对耐腐蚀性的影响.
- 了解影响Zn-Mg材料腐蚀的微结构演变.
主要方法:
- 严重的塑性变形 (SPD) 使用高压扭转 (HPT) 在Zn-3Mg (wt.%) 合金和混合.
- 腐蚀行为评估作为HPT转的函数 (1, 5, 15).
- 在15圈后,对HPT混合体的腐蚀测试具有不同的Mg含量 (3,10,30%).
主要成果:
- 通过HPT加工,诱导了具有超细Mg丰富的颗粒和纳米尺度的金属间结构的多式粒度结构.
- 增加的HPT转化为由于金属间相位形成而增强的耐腐蚀性.
- 与合金对应物相比,HPT混合物表现出优越的耐腐蚀性,这是由于加工引起的不均性.
结论:
- SPD加工,特别是HPT,显著提高了Zn-Mg合金和混合物的耐腐蚀性.
- 在HPT过程中形成金属间相是提高腐蚀性能的关键.
- 通过HPT处理的混合材料显示出可生物降解的植入物应用的前景,尽管较高的Mg含量降低了耐腐蚀性.
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