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Development of liquid metal process using local imposition of electromagnetic vibration

利用局部施加电磁振动开发液态金属工艺

基本信息

批准号：
15360400
负责人：
IWAI Kazuhiko
金额：
$ 9.54万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360400/
关键词：
solidification refinement electromagnetic vibration electric current magnetic field 電磁場振動

项目摘要

A Sn-Pb alloy has been solidified by using an electromagnetic method in which oscillation was locally imposed by a simultaneous imposition of a static magnetic field and an alternating current to control the solidified structures. In the case that only the static magnetic field was imposed, coarse grains were obtained due to no vibration, while in the case of the simultaneous imposition of the electrical current and the magnetic field, the structure was completely refined in the whole observed area. Then, this method has a refining function of the solidified structure.Furthermore, refining mechanism of this process has been experimentally examined. The refining period of the structure was examined by changing the imposing period of the electromagnetic vibration on the sample and it was confirmed as the initial stage of solidification. The refining region was specified to be around the electrodes by inserting a stainless steel wire net in the sample while it was independent of the inserting position of the electrodes. Convection was induced by the electromagnetic vibration because temperature difference in the sample drastically decreased as soon as the vibration was excited in the sample. From these experimental results, the estimated mechanism in this process is that dendrite tips around the electrodes are cut off by the electromagnetic vibration in the initial stage of the solidification and it spread to the whole area of the sample by the convection induced by the electromagnetic vibration. In addition, nucleation is induced by an intense electromagnetic vibration.

采用电磁法对Sn-Pb合金进行了凝固实验，在凝固过程中同时施加静磁场和交变电流，使合金局部产生振荡，从而控制凝固组织。在仅施加静磁场的情况下，由于没有振动而获得粗晶粒，而在同时施加电流和磁场的情况下，在整个观察区域中完全细化了结构。此外，还对该工艺的细化机理进行了实验研究。通过改变电磁振动对样品的施加周期来检查组织的细化周期，并确认其为凝固的初始阶段。通过在样品中插入不锈钢丝网，将精炼区域指定为电极周围，而精炼区域与电极的插入位置无关。对流是由电磁振动引起的，因为一旦在样品中激发振动，样品中的温差就急剧减小。从这些实验结果，在这个过程中，估计的机制是，在凝固的初始阶段的电极周围的枝晶尖端被切断的电磁振动和它蔓延到整个区域的样品由电磁振动引起的对流。此外，成核是由强烈的电磁振动引起的。