Role of C and Fe in Grain Refinement of an AZ63B Magnesium Alloy by Al-C Master Alloy  

作　　者：Yichuan PAN+, Xiangfa LIU and Hua YANG Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University,Jinan 250061, China 

出　　处：《Journal of Materials Science & Technology》2005年第6期822-826,共5页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.50171037);Natural Science Foundation of Shandong Province of China(No.Z2004F03).

摘　　要：In this study, grain refining effect of Al-1.5℃ master alloy was examined on an AZ63B magnesium alloy, and the refining mechanism was studied through investigating the role of C and Fe in this process. The results show that addition of Al-1.5℃ master alloy leads to significant decrease of the mean grain size from about 270μm to 50μm at the center of the AZ63 alloy ingot. Grain refinement by carbon addition is mainly due to the heterogeneity nucleation on the Al-, C-, O-, Fe- and Mn-rich particles, but not constitutional undercooling caused by the carbon solute element. Fe plays an important role in the formation of the nucleating particles, but not acts as an inhibiting element.In this study, grain refining effect of Al-1.5℃ master alloy was examined on an AZ63B magnesium alloy, and the refining mechanism was studied through investigating the role of C and Fe in this process. The results show that addition of Al-1.5℃ master alloy leads to significant decrease of the mean grain size from about 270μm to 50μm at the center of the AZ63 alloy ingot. Grain refinement by carbon addition is mainly due to the heterogeneity nucleation on the Al-, C-, O-, Fe- and Mn-rich particles, but not constitutional undercooling caused by the carbon solute element. Fe plays an important role in the formation of the nucleating particles, but not acts as an inhibiting element.

关 键 词：Grain refinement AZ63B MAGNESIUM Al-C master alloy Nucleating particle 

分 类 号：TG132.27[一般工业技术—材料科学与工程]