(1. 上海交通大學(xué) 輕合金精密成型國(guó)家工程研究中心，上海 200240；
2. 上海交通大學(xué) 金屬基復(fù)合材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，上海 200240；
3. 上海交通大學(xué) 材料科學(xué)與工程學(xué)院，上海 200240)
摘 要: 闡述鎂合金中的夾雜物種類及其危害，鎂合金含有MgO、Mg3N2、MgS、α-Fe、MnAl6、Fe2(Si，B)、Fe3(Al，Si)、(Fe，Mn)3Si和(Fe，Mn)5Si3等非金屬夾雜物及Fe、Cu和Ni等有害金屬元素。非金屬夾雜物會(huì)嚴(yán)重降低合金的強(qiáng)度和韌性；Fe等有害元素會(huì)大幅度增加鎂合金的腐蝕速率。重點(diǎn)闡述鎂合金雙活性加硼熔劑除鐵技術(shù)及其除鐵效果。針對(duì)稀土鎂合金的凈化難題，介紹稀土鎂合金的專用凈化熔劑、MgO泡沫陶瓷過濾器及旋轉(zhuǎn)噴吹等鎂合金非熔劑凈化方法。綜述復(fù)合凈化對(duì)鎂合金力學(xué)性能、流動(dòng)性及熱裂性的影響，并展望鎂合金凈化技術(shù)的未來發(fā)展。
關(guān)鍵字: 鎂合金；凈化；夾雜；力學(xué)性能；流動(dòng)性；熱裂性
（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
