超声波探针垂直位置对Al-2%Si铸锭凝固组织的影响  

Effect of Vertical Probe Location on Crystal Structure of Ultrasonic Ingot of Al-2%Si Alloy During Solidification

作　　者：李军文[1,2] 桃野正[2] 宋生海[1] 蒋恩杰[1] 

机构地区：[1]辽宁工业大学材料与化学工程学院,辽宁锦州121001 [2]国立室兰工业大学材料物性工学科

出　　处：《有色金属》2009年第2期8-12,共5页Nonferrous Metals

基　　金：教育部留学回国人员科研启动基金资助项目(20071067);辽宁省自然科学基金资助项目(20082177);辽宁省教育厅创新团队项目(20081224)

摘　　要：研究超声波探针垂直位置对Al-2%Si铝合金铸锭凝固组织的影响。结果表明,在探针沿着铸型中心线的垂直方向上探针浸深较浅时,得到的细等轴晶区域较大,探针浸深较深时,得到的细等轴晶区域较小,且探针曾经浸入的地方有气孔出现。细等轴晶是由于压力变化引起熔点的上升,生成稳定的固相而形成的。强音响流起着分散金属熔体内刚形成的固相的作用。为了获得最佳的细化效果,超声波探针应浸入熔体表面的中心附近。The effect of vertical probe location on solidification structure of ultrasonic Al-2% Si alloy ingots is investigated. The results show that for the vertical case, the equiaxed grain zone is relatively big when the immersed depth of the probe is small, and the equiaxed grain zone is relatively small, moreover, there is porosity existing when the immersed position is deep. The fine equiaxed crystal formation is because that the melt point of the system is increased by the pressure waves, therefore a stable solid phase formed from the liquid phase. The acoustic streaming play an important role distributes the new solid phase. The grain refinement effect becomes the best when the probe end is dipped into the melt from the position that is adjacent center surface of melt.

关 键 词：金属材料 超声波振动 探针垂直位置 Al-2%Si合金 铸锭 晶粒细化 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.12[金属学及工艺—金属材料]