超声波探针水平位置对Al-1.65%Si合金铸锭凝固组织的影响  

EFFECT OF PROBE HORIZONTAL LOCATION ON CRYSTAL STRUCTURE OF INGOT DURING SOLIDIFICATION OF Al-1.65%Si ALLOY UNDER ULTRASONIC VIBRATION

作　　者：李军文[1] 由向群[1] 桃野正[2] 田汤善章[2] 

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：《金属材料与冶金工程》2007年第5期3-6,共4页Metal Materials and Metallurgy Engineering

基　　金：辽宁省教育厅科研基金(2005L186);辽宁工业大学留学归国人员科研启动基金(2005LG001)

摘　　要：通过使用Al-1.65%Si合金进行了一系列实验,研究了超声波探针水平位置变化对铸锭凝固组织的影响。探讨了超声波的晶粒细化机理。结果表明:在探针固定于水平方向不同位置的条件下,当探针位于铸型中心线浸入熔体时,得到的细等轴晶区最大,且呈对称分布;当探针的固定位置贴近铸型壁时,细等轴晶区向探针端面附近集中并缩减,柱状晶区进一步扩大;根据克劳修斯-克拉柏龙方程,细等轴晶是由于超声波引起压力脉冲而导致金属的熔点上升,生成稳定的固相而形成的。In this study, a series of experiments were conducted by Al-1.65%Si alloy to investigate the effect of probe horizontal location on solidification structure of ultrasonic ingots. In addition, using mixture of aluminum powder and water carried out the simulation test. Finally, the mechanism of grain refinement under ultrasonic field was investigated. The results show that： The equiaxed grain zone is the biggest when the probe position is at the centerline of the mould in the conditions of probe set at difference horizontal positions; The equiaxed grain zone is reduced to the probe end when the probe position is nearby the mould wall; The finer equiaxed crystal produced is because that the Clausious- Clapyron Equation indicates that the effect of the pressure waves induced by ultrasonics of this intensity are totally inadequate to cause a phase change of liquid to solid due to the increase of melting point; The acoustic streaming distribute the new solid phase.

关 键 词：超声波振动 探针水平位置 Al-1.65%Si合金 铸锭 结晶组织 

分 类 号：TG24[金属学及工艺—铸造]