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| 1 | Microstructure and texture evolution of fine-grained Mg-Zn-Y-Nd alloy micro-tubes for biodegradable vascular stents processed by hot extrusion and rapid cooling显示文摘Magnesium alloys have narrow available slip result from close-packed hexagonal structure that limit their processing properties.In the recent work,the Mg-2Zn-0.46Y-0.5Nd,as materials for degradable stents,was applied to produce as-extruded micro-tube with an outer diameter of 3.0mm and a wall thickness of 0.35mm by hot extrusion with an extrusion ratio of 105:1 at 653K and rapid cooling.The fine microstructure of the dynamic recrystallization of as-extruded micro-tube could be preserved by rapid cooling such as water-cooled,resulting in more excellent mechanical properties relative to air-cooled micro-tube.The addition of rare earth elements Y and Nd results in continuous dynamic recrystallization dominated the dynamic recrystallization mechanism.During the hot extrusion process,the activation of the non-basal slip system,especially the pyramidal(c+a)slip,could significantly weaken the texture strength,and the as-extruded micro-tube exhibits weak'RE'texture components(011^(-)1)||ED and(1^(-)21^(-)1)||ED.Hence,the magnesium alloy micro-tube prepared by the rapid cooling has fine microstructure and weak texture,which is favorable for further process and governance. | Kaikai Guo Mengyao Liu Jianfeng Wang Yufeng Sun Weiqing Li Shijie Zhu Liguo Wang Shaokang Guan | 2020 | Journal of Magnesium and Alloys2020，8，3： | 3 |
| 2 | Nd合金化对生物医用Mg-Zn-Sn合金腐蚀性能的影响显示文摘将稀土元素Nd添加到Mg-2Zn-3Sn合金中,采用金属型铸造制备了Mg-2Zn-3Sn-xNd(x=0,0.5,1,2,质量分数,%)合金,采用光学显微镜(OM)、扫描电镜(SEM)及X射线衍射(XRD)等分析了铸态Mg-2Zn-3Sn-xNd合金的微观组织,应用电化学测试和Hank’s溶液静态浸泡测试研究了其耐腐蚀性能。结果表明,铸态Mg-2Zn-3Sn-xNd合金由α-Mg相、MgSnNd相、Mg2Sn相和少量的MgZn相组成。与Mg-2Zn-3Sn合金相比,Mg-2Zn-3Sn-xNd合金的晶粒得到明显细化。少量Nd(0.5%、1%)可提高Mg-2Zn-3Sn合金的耐腐蚀性,但当Nd的添加量较高时(2%),电偶腐蚀加剧,合金的耐腐蚀性能降低。Mg-2Zn-3Sn-0.5Nd合金的耐腐蚀性能最佳,说明适量Nd可改善Mg-2Zn-3Sn合金的耐腐蚀性。 | 高云 赵平 王玮 陈克正 | 2023 | 特种铸造及有色合金2023，43，5： | 0 |
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