AZ91D镁合金近液相线铸造研究  

STUDY ON THE NEAR-LIQUIDUS CASTING OF AZ91D MAGNESIUM ALLOY

作　　者：乐启炽[1] 欧鹏[1] 吴跃东[1] 路贵民[1] 崔建忠[1] 邱竹贤[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110004

出　　处：《金属学报》2002年第2期219-224,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基余59974009;教育部博士点基金21011045003;第29批博士后科学基金资助项目

摘　　要：采用近液相线铸造的方法浇铸了镁合金 ＡＺ９１Ｄ，并与液相铸造的组织进行了对比。通过不同铸模浇铸考察厂冷却速率对组织的影响，研究了近液相线铸造时的静置时间对铸造组织的影响。实验结果表明，液相（６００℃）铸造组织与常规铸造组织接近，高冷却速率促进了枝晶化：近液相线铸造方法有利于组织的细化和球化，但下如铝合金旋著：增加冷却速率有利于组织的细化，也促进了球化的趋势，并对近液相线组织的演变机理进行了初步探讨。The near-liquidus casting process was used in casting AZ91D alloy. and its microstructure was compared with that prepared by liquid casting. The effects, of cooling rate in casting process and the holding time in near-liquidus on microstructure tire were also observed. The results indicate that the microstructure obtained from liquid casting is similar to that of conventional casting. and dendriticization is promoted at higher cooling rate. On the contrary. near-liquidus casting is beneficial to refining and spheriodization of casting microstructure, however, whose effect is not apparent as comparing with alumimum alloy. The refining degree increases with increasing cooling rate, and the evolution mechanism of casting micrustructure for near-liquidus casting was discussed.

关 键 词：镁合金 近液相线铸造 微观组织 

分 类 号：TG249.9[金属学及工艺—铸造] TG292