简介概要

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



详情信息展示

文章编号:1004-0609(2010)06-1021-11

镁合金纯净化研究新进展

吴国华1, 2, 3,孙  明1, 2, 3,王  玮1, 2, 3,丁文江1, 2, 3

(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。

关键词:镁合金;净化;夹杂;力学性能;流动性;热裂性

中图分类号:TG146       文献标志码:A

New research development on purification technology of magnesium alloys

WU Guo-hua1, 2, 3, SUN Ming1, 2, 3, WANG Wei1, 2, 3, DING Wen-jiang1, 2, 3

 (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


我国是世界上镁矿资源最富有的国家,中国工程院在2005年《我国富有资源镁及镁合金发展战略研究报告书》中指出,金属镁以其本身特有的资源、性能、环境和价格优势成为21世纪我国材料工业持续发展的必然选择[1]。由于镁合金具有密度小、比强度和疲劳强度高、比弹性模量好以及优良的切削加工性能,使镁合金在一系列国防尖端领域及日常制造业中被广泛应用[2-6],譬如,汽车减重节能和环保的要求推动镁合金在汽车领域的大规模开发应用[7]。随着对镁合金研究的不断深入,人们发现镁合金较低纯净度已成为制约镁合金应用的关键瓶颈之一,尤其是氧化等夹杂成为破坏力学性能和腐蚀性能的发源地[8]。镁合金内较高的夹杂物含量不仅限制镁合金材料潜力的发挥,而且还大大降低镁合金材料的成型性能及耐蚀性[9]。因此,有必要采取净化措施来提高镁熔体的纯净度,提升镁合金的品质。这对于促进镁合金产业发展,具有重要意义。

1  镁合金中的夹杂物及危害

由于镁化学性质活泼,在原镁生产及合金熔炼过程中极易产生氧化夹杂,恶化铸件品质及力学性能。影响镁合金品质的夹杂物根据成分和结构不同主要分为非金属夹杂物和金属夹杂物,非金属夹杂物如[10]:MgO、Mg3N2、MgS、α-Fe、MnAl6、Fe2(Si,B)、Fe3(Al,Si)、(Fe,Mn)3Si和(Fe,Mn)5Si3等。图1所示为GW103K (Mg-10Gd-3Y-0.5Zr)合金中夹杂物的典型 形貌[11]

图1  GW103K镁合金中夹杂物的典型形貌

Fig.1  Typical morphologies of nonmetallic inclusions in GW103K Mg alloy: (a) Inclusion bar; (b) Spherical inclusion; (c) Irregular inclusion; (d) Fine inclusion

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