TiC对金属型铸造ZA104合金铸态组织、力学性能及凝固行为的影响  

Effects of TiC on As-Cast Microstructure, Mechanical Properties and Solidification Behaviour of ZA104 Permanent Moulding Alloy

作　　者：杨明波[1] 潘复生[2] 白亮[2] 胡红军[1] 

机构地区：[1]重庆工学院,重庆400050 [2]重庆大学,重庆400030

出　　处：《稀有金属材料与工程》2008年第5期766-770,共5页Rare Metal Materials and Engineering

基　　金：国家863高技术研究项目(2001AA331050);重庆市科技攻关项目(2006AA4012-9-6)

摘　　要：研究了TiC对金属型铸造ZA104合金铸态组织、力学性能及凝固行为的影响。结果表明:添加0.5%TiC对ZA104合金组织的构成没有影响,组织由α-Mg基体、Mg32(Al,Zn)49和Al2Mg5Zn2相组成。但添加TiC可使合金组织细化,并使Mg32(Al,Zn)49相从连续状变为半连续状和/或颗粒状分布,且分布更加弥散均匀。添加0.5%TiC可使金属型铸造ZA104合金的室温和高温抗拉性能以及抗蠕变性能提高,对合金凝固过程中的相变类型也没有影响,但可使合金的凝固温度范围降低和铸造流动性提高。In this paper, the effects of TiC on the as-cast microstructure, mechanical properties and solidification behaviour of ZA104 permanent moulding alloy have been investigated. The results indicate that the as-cast microstructure of ZA104＋0.5TiC is mainly composed of α-Mg, Mg32（Al,Zn）49 and Al2Mg5Zn2 phase, similar to the ZA104 alloy without adding TiC. But the as-cast microstructure of ZA104＋0.5TiC alloy is more fine than that of ZA104 alloy, the morphology of Mg32（Al,Zn）49 ternary phases on the grain boundaries changes from continuous net to quasi-continuous net and/or particle shape, and the distribution of ternary phases changes to be more dispersive and homogeneous. In addition, it can obviously improve the tensile and creep properties at room temperature and 150℃ by adding 0.5TiC to ZA104 alloy, and does not affect the phase transformation types during the solidification process. However, it can decrease the solidification temperature range, then improve the fluidity of ZA104 alloy by adding 0.5TiC.

关 键 词：高温镁合金 Mg-Zn-Al系合金 ZA104合金 TIC 

分 类 号：TG136.1[一般工业技术—材料科学与工程]