(1. 上海交通大学 轻合金精密成型国家工程研究中心，上海 200240；
2. 上海交通大学 金属基复合材料国家重点实验室，上海 200240；
3. 上海交通大学 材料科学与工程学院，上海 200240)
摘 要: 阐述镁合金中的夹杂物种类及其危害，镁合金含有MgO、Mg3N2、MgS、α-Fe、MnAl6、Fe2(Si，B)、Fe3(Al，Si)、(Fe，Mn)3Si和(Fe，Mn)5Si3等非金属夹杂物及Fe、Cu和Ni等有害金属元素。非金属夹杂物会严重降低合金的强度和韧性；Fe等有害元素会大幅度增加镁合金的腐蚀速率。重点阐述镁合金双活性加硼熔剂除铁技术及其除铁效果。针对稀土镁合金的净化难题，介绍稀土镁合金的专用净化熔剂、MgO泡沫陶瓷过滤器及旋转喷吹等镁合金非熔剂净化方法。综述复合净化对镁合金力学性能、流动性及热裂性的影响，并展望镁合金净化技术的未来发展。
关键字: 镁合金；净化；夹杂；力学性能；流动性；热裂性
（1. National Engineering Research Center of Light Alloy Net Forming，Shanghai Jiao Tong University, Shanghai 200240, China;
2. Key State Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China;
3. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The kinds and hazard of inclusions in the magnesium alloys were clarified. The non-metallic inclusions, such as MgO, Mg3N2, MgS, α-Fe, MnAl6, Fe2(Si,B), Fe3(Al,Si), (Fe,Mn)3Si and (Fe,Mn)5Si3, and deleterious elements, such as Fe, Cu and Ni, always present in the magnesium alloys. The non-metallic inclusions severely decrease the strength and ductility, while Fe sharply increases the corrosion rate of the magnesium alloys. The Fe reduction technology as well as the reduction effectiveness of double-activity boron addition technique was emphasized. Aiming at the purification problem of Mg-RE alloys, the dedicated fluxes were introduced. Moreover, the non-flux purification methods including MgO ceramic foam filter (CFF) and gas bubbling technology were described. The effects of composite purification technology (CPT) on the mechanical properties, fluidity and hot cracking were reviewed. At last, the development prospect of purification technology of magnesium alloys was presented.
Key words: magnesium alloys; purification; inclusions; mechanical property; fluidity; hot cracking
