镁合金纯净化研究新进展

来源期刊:中国有色金属学报2010年第6期

论文作者:吴国华 孙明 王玮 丁文江

文章页码:1021 - 1031

关键词:镁合金;净化;夹杂;力学性能;流动性;热裂性

Key words:magnesium alloys; purification; inclusions; mechanical property; fluidity; hot cracking

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。

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.

基金信息:国家重点基础研究发展计划资助项目
国家高技术研究发展计划资助项目
上海市优秀学科带头人计划资助项目

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