高硅镁合金的制备工艺及显微组织分析  

Preparation Process and Microstructure of High-Silicon Magnesium Alloy

作　　者：王怀国[1] 张景新[1] 张奎[1] 徐骏[1] 石力开[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《稀有金属》2003年第4期500-502,共3页Chinese Journal of Rare Metals

基　　金：国家重点基础研究发展规划 ( 973 )项目 (G2 0 0 0 0 672 0 2 )

摘　　要：The preparation technique for a high silicon magnesium alloy ASE640 was explored. Different addition forms of silicon element to magnesium melt were compared and the master alloy method was selected. In addition, microstructure and phase structure of this alloy were investigated with optical microscope, scan electronic microscope and X ray diffraction meter. The dissolution rate of Si in magnesium melt was discussed. It shows that the smaller the primary silicon strips in the master alloy are, the higher the dissolution rate and the less dissolution time are. The experimental results show that in as cast ASE640 alloy a lot of Mg 2Si intermetallic compound particles are found and they present the shape of Chinese characters. However, the mechanical properties at room temperature and creep properties at elevated temperature are decreased for the coarse Mg 2Si grains. The Mg 2Si grains can be refined by hot extrusion and dispersed uniformly in the matrix, which may efficiently improve the mechanical properties of the alloy.The preparation technique for a high silicon magnesium alloy ASE640 was explored. Different addition forms of silicon element to magnesium melt were compared and the master alloy method was selected. In addition, microstructure and phase structure of this alloy were investigated with optical microscope, scan electronic microscope and X ray diffraction meter. The dissolution rate of Si in magnesium melt was discussed. It shows that the smaller the primary silicon strips in the master alloy are, the higher the dissolution rate and the less dissolution time are. The experimental results show that in as cast ASE640 alloy a lot of Mg 2Si intermetallic compound particles are found and they present the shape of Chinese characters. However, the mechanical properties at room temperature and creep properties at elevated temperature are decreased for the coarse Mg 2Si grains. The Mg 2Si grains can be refined by hot extrusion and dispersed uniformly in the matrix, which may efficiently improve the mechanical properties of the alloy.

关 键 词：金属材料 镁合金 制备工艺 显微组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]