研究了超声波探头位置变化对Al-5.7%Cu合金铸锭凝固组织的影响,考察了探头水平位置变化对等轴晶占有率的影响,探讨了超声波作用下晶粒细化机理.结果表明:当探头浸入深度相同且位于铸型中心线时,得到的细等轴晶区最大,且呈对称分布;当探头的位置贴近铸型壁时,细等轴晶区向探头端面附近集中并缩减,柱状晶区进一步扩大.超声波的细化效果来自于声空化造成微区瞬时过冷,以及动态形核;而声流造成凝固的枝晶破碎,提供结晶核心.
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