Al-5.1Ti-0.29C细化剂对AZ91D合金组织与性能的影响  

Effect of Al-5.1Ti-0.29C Grain Refiner on Microstructure and Properties of AZ91D Alloy

作　　者：白雅[1] 徐春杰[2] 李亚维 

机构地区：[1]长安大学理学院,陕西西安710064 [2]西安理工大学材料科学与工程学院,陕西西安710048 [3]中船重工第十二研究所,陕西兴平713102

出　　处：《铸造技术》2015年第4期961-963,984,共4页Foundry Technology

基　　金：陕西省国际科技合作重点计划资助项目(2013KW16);长安大学中央高校基金资助项目(CHD2011JC117);陕西省教育厅科研计划资助项目(2013JK0914)

摘　　要：通过向熔体中直接添加Al-5.1Ti-0.29C细化剂,研究了不同含量和不同加入温度对AZ91合金晶粒细化效果、机理及力学性能的影响。结果表明,Al-5.1Ti-0.29C细化剂对AZ91D合金有明显的细化作用,加入温度对组织和性能也有一定影响,其中710℃时加入2.5%的细化剂效果最佳,合金的力学性能最好。Al-5.1Ti-0.29C细化剂中Al4C3的细化作用是碳质孕育作用,Ti C的作用机制是在熔体中形成异质形核核心。The effects of different content of Al-5.1Ti-0.29C（wt.%） and different adding temperatures on grain size, refining mechanism and mechanical properties of AZ91 alloy were investigated. The results Show that the Al-5.1Ti-0.29C has a very significant refining role for AZglD alloy, and the adding temperature has also an impact on the microstructure and mechanical properties. The grain size is more refinement when added 2.5% Al-5.1Ti-0.29C, and the mechanical properties of the alloy is also best. The mechanism of grain refinement by Al4C3 in Al-5.1Ti-0.29C is attributed to carbon inoculation, and the mechanism is the formation of TiC heterogeneous nucleation in the melt.

关 键 词：AZ91D镁合金 晶粒细化 力学性能 碳质孕育 异质形核 

分 类 号：TG292[金属学及工艺—铸造] TG146.22[一般工业技术—材料科学与工程]