Microstructure of Al-4.99Zr-1.1B Master Alloy and Its Grain Refinement Effect on AZ31 Magnesium Alloy

摘要：

　　An Al-4.99Zr-1.1B master alloy was fabricated by in-situ synthesis from Al melt and K2 ZrF4 + KBF4 mixed powder.The microstruc ture of the Al-4.99Zr-1.1B master alloy and its grain refinement effect on AZ31 magnesium alloy were studied by XRD, OM, SEM and EDS.Results show that a large number of fine ZrB2 partides can be observed in the Ai-4.99Zr-1.1 B master ahoy.With increasing the addition amount of Al-4.99Zr -1.1B master ahoy, the primary α-Mg grains of AZ31 magnesium ahoy are further refined and the network structure of the intermetallic β-Mg17 Al12 phase is changed into small blocky structure.When adding 0.6 % Al-4.99Zr-1.1B master ahoy, the average size of primary α-Mg grains is reduced from 170 μm to 45 μm.The present results indicated that the ZrB2 particles can act as the effective heter ogeneous nuclei of α-Mg grains and is responsible for the grains refinement of AZ31 magnesium alloy.

关键词： Al-Zr-B master alloy AZ31 magnesium alloy Grain refinement

作者: Shuncheng WANG Fanghua ZHONG Xiaohui LI Wenjun QI and Kaihong ZHENG

作者单位: Institute of Metal Forming and Process Technology,Guangdong General Research Institute of Industrial Technology (Guangzhou Research Institute of Nonferrous Metals),Guangzhou 510650,China

会议类型: 国际会议

会议名称: The 12th China-Russia Symposium on Advanced Materials and Technologies(第十二届中俄双边新材料新工艺国际会议)

会议地点: 昆明

会议语种:英文

页码: 84-88

在线出版日期: 2013-11-19（万方平台首次上网日期，不代表论文的发表时间）