摘要
对高能超声稀释原位反应烧结块制备锌铝合金基复合材料过程进行了研究,简要分析了超声稀释机理。研究表明,高能超声快速稀释烧结块是声空化与声流效应协同作用的结果。空化产生的瞬时高温可促进界面区域元素扩散,瞬时高压将裸露在界面上的长棒状的TiAl3击断,打破了烧结块的网状结构,并将其周围的高致密度的Al2O3和TiB2颗粒聚集区击碎。另一方面,声流引起的强烈搅拌作用减薄了过渡层,并使短棒状的TiAl3颗粒及Al2O3、TiB2微细颗粒均匀分布在熔体中。在上述分析基础上,建立了元素扩散模型和烧结块在锌铝合金中的稀释过程模型。
The ultrasonic dilution mechanism was analyzed through studying the fabrication process of the Zn-Al alloy matrix composites by high-intensity ultrasonic dilution of XD composites. The results show that the mechanism of ultrasonic dilution of the XD composites is the result of the cooperative effects of the acoustic cavitation and high speed acoustic streaming in the Zn-Al alloy melt. The instantaneous high temperature caused by the acoustic cavitation can promote the element＇s diffusion between the interface of XD composites and the Zn-Al alloy melt. The instantaneous high pressure breaks off the long rod-like TiAl3 phase protruding along the XD composite/ Zn-Al interface, and drives the gathering particles out of the net of the rod-like TiAl3 phase. On the other hand, the intensitive agitation caused by the acoustic streaming thins the interface area and makes the short rod-like TiAl3 phase and fine particles （Al2O3 and TiB2） homogeneously disperse in the Zn-Al alloy melt. On the basis of the results, the models of the element diffusion and dilution process of the XD composites into the Zn-Al alloy melt were established.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2005年第6期37-43,共7页
Acta Materiae Compositae Sinica
基金
国家自然科学基金资助项目(59971017)
江苏省博士后科研资助计划资助项目
关键词
烧结块
声空化
声流
稀释
XD composites
acoustic cavitation
acoustic streaming
dilution
