Effect of the addition of Al-Ti-C master alloy on the microstructure and microhardness of a cast Al-10Mg alloy  

作　　者：Kuibo Yin Xiufang Bian Na Han Xiujun Yao Yan Zhao Jiankun Zhou 

机构地区：[1]Key Lab of Liquid Structures and Heredity of Materials, Ministry of Education, Shandong University, South Campus, Jinan 250061, China [2]National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

出　　处：《Journal of University of Science and Technology Beijing》2006年第2期149-153,共5页北京科技大学学报（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China (No. 50231040).

摘　　要：The microstructure and microhardness of a cast Al-10wt%Mg （henceforth Al-10Mg） alloy with 0.2wt% addition of Al- 5Ti-0.25C master alloy were compared with those of a refiner-free alloy of similar chemical composition. It was found that this level of the master alloy addition not only caused an effective grain refinement, but also caused a significant increase in the microhardness of the Al-10Mg alloy. Microchemical analysis revealed that TiC particles existed in the grain center. The relationship between the holding time and grain size was also studied. It shows that the grain refining efficiency is faded observably with the holding time. This is explained in terms of the instability of TiC particles.The microstructure and microhardness of a cast Al-10wt%Mg （henceforth Al-10Mg） alloy with 0.2wt% addition of Al- 5Ti-0.25C master alloy were compared with those of a refiner-free alloy of similar chemical composition. It was found that this level of the master alloy addition not only caused an effective grain refinement, but also caused a significant increase in the microhardness of the Al-10Mg alloy. Microchemical analysis revealed that TiC particles existed in the grain center. The relationship between the holding time and grain size was also studied. It shows that the grain refining efficiency is faded observably with the holding time. This is explained in terms of the instability of TiC particles.

关 键 词：Al-Mg alloy Al-Ti-C alloy MICROHARDNESS grain refinement 

分 类 号：TG146.21[一般工业技术—材料科学与工程]