挤压态Mg-Zn-Nd医用镁合金的组织与性能研究

摘要

本文设计并制备了一种新型的Mg-Zn-Nd系列医用镁合金，合金经挤压变形后，对合金的微观组织、力学性能以及降解性能进行了研究。结果表明，Nd元素可以显著细化再结晶晶粒尺寸；由于Nd元素对于镁合金堆垛层错能的影响，使合金的塑性变形性能大幅度改善。另外， Mg-Nd第二相的存在有助于提高合金的耐腐蚀性能，使合金呈现出均匀腐蚀的特点。%Novel Mg-Zn-Zd bio-medical alloys were designed and prepared in this study, and their micro-structure, mechanical properties and biodegradability were investigated. The results showed that Nd could effectively reifne the grain size of the re-crystallized alloy and greatly improve the ability of plastic deformation through decreasing the stacking default energy of the alloy. In addition, the Mg-Nd second phases could help to improve the corrosion resistance of the alloy, making the alloy to degrade uniformly.