基于消失模铸造AZ91+X%Cd+Y%MM镁合金的研制  

Development of AZ91+X%Cd+Y%MM Magnesium Alloy Prepared by Lost Foam Casting

作　　者：田学锋[1] 樊自田[2] 黄乃瑜[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]华中科技大学材料科学与工程学院,湖北武汉430074

出　　处：《铸造》2009年第1期28-31,共4页Foundry

基　　金：国家自然科学基金资助项目(50275058)

摘　　要：在消失模铸造条件下,采用Cd和混合稀土(MM)对AZ91合金的力学性能及凝固范围进行研究。结果表明,Cd和MM的复合加入能够硬化、强化及韧化AZ91合金,新型AZ91合金最佳成分定为AZ91+0.5Cd+0.6MM,力学性能优于传统AZ91合金。AZ91+0.5Cd+0.6MM合金液固相线温度分别为655.05℃和606.55℃,凝固区间仅为48.5℃,远远小于AZ91合金凝固范围(128℃)。缩小的凝固范围能够提高合金铸造工艺性能。The mechanical properties and freezing range of AZ91 alloy fabricated by lost foam casting process were investigated with Cd and mischmetal （MM） as modifiers. The results show that the mixed additions of Cd and MM can harden, strengthen, toughen the AZ91 alloy and the optimal composition was AZ91＋0.5Cd＋0.6MM. The freezing range of AZ91＋0.5Cd＋0.6MM alloy is only 48.5 ℃ with liquids temperature 655.05℃ and solidus temperature 606.55 ℃, which is much lower than the freezing range of AZ91 alloy （ 128 ℃）. The smaller freezing range can improve the casting processing properties of the alloy.

关 键 词：新型镁合金 消失模铸造 微观组织 力学性能 

分 类 号：TG249.5[机械工程—精密仪器及机械]