Effect of power ultrasound on solidification of aluminum A356 alloy
Effect of power ultrasound on solidification of aluminum A356 alloy
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DOI：
10.1016/j.matlet.2004.09.027
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发表时间：
2005-01-01
影响因子：
3
通讯作者：
Han, Q
中科院分区：
文献类型：
--
作者：
Jian, X;Xu, H;Han, Q
研究了超声振动对A356铝合金熔体形核和长大的影响。将声辐射器浸入A356合金熔体中，对不同固相率的熔体进行超声振动等温处理。实验结果表明，在接近液相线的温度下对熔体进行超声处理，然后快速冷却，可以有效地获得球状晶粒。这进一步说明了在糊状区等温处理时难以形成球状晶粒。这可能意味着在给定的实验中，空泡诱导的异质形核比枝晶破碎在球形晶粒的形成中起着更重要的作用。(C)2004 Elsevier B.V.保留所有权利。
The present investigation attempted to evaluate the effect of ultrasonic vibration on the nucleation and growth of aluminum alloy A356 melt. A356 melt was treated at various solid fractions isothermally with ultrasonic vibrations by dipping the acoustic radiator into the melt. Experimental result confirmed that globular grains could be effectively obtained when the melt was ultrasonically treated at the temperature close to its liquidus and subsequently cooled quickly. It further illustrated the difficulty to form globular grains when the specimens were treated at isothermal temperatures in the mushy zone. It may imply that in the given experiments cavitations-induced heterogeneous nucleation plays a more important role than dendrite fragmentation in the formation of globular grains. (C) 2004 Elsevier B.V. All rights reserved.