Effects of vibration during solidification
Effects of vibration during solidification
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DOI：
10.1179/imtr.1981.26.1.71
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发表时间：
1981
影响因子：
16.1
通讯作者：
J. Campbell
中科院分区：
文献类型：
--
作者：
J. Campbell
摘要从频率-振幅f-a图这一统一概念出发，综述了振动对凝固影响的文献。一些理论模型与f-a图上总结的文献数据进行了评估，揭示了机械破碎模型是最适合枝晶凝固合金的模型。对于纯金属等在平面面上凝固的材料，f-a图显示了空化的理论阈值与晶粒细化的开始之间的密切相关。一般来说，似乎没有证据表明超声波、音速和亚音速振动之间有根本区别。毫无疑问，机械、腐蚀和其他性能方面的改进迄今为止似乎被令人烦恼的副作用所抵消，如从熔体中喷出液体（这是令人满意的预测和可避免的）；在空化状态下振动时偶尔出现孔隙（可预测且可能避免）；枝晶粗化…
AbstractA review of the literature on the effects of vibration on solidification is presented in terms of a unifying concept, the frequency–amplitude f-a map. Some theoretical models are assessed in relation to data from the literature summarized on the f-a map, revealing a mechanical-fragmentation model as a best fit for dendritically solidifying alloys. For materials such as pure metals solidifying on a planar front the f-a map shows a close correlation between the theoretical threshold for cavitation and the onset of grain refinement. In general, there seems little evidence to suggest fundamental differences between ultrasonic, sonic, and subsonic vibration. The undoubted improvements to mechanical, corrosion, and other properties appear to be countered to date by troublesome side effects such as ejection of liquid from the melt (which is satisfactorily predicted and avoidable); occasional porosity when vibrating in a cavitation regime (predictable and potentially avoidable); coarsening of dendrite str...