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Solidification of immiscible alloys

更新时间:2015-6-11 15:04:51  点击:0

报告人 赵九洲
报告标题 Solidification of immiscible alloys
报告摘要 A lot of alloys show a phase diagram with a miscibility gap in the liquid state. These alloys are especially suitable for the manufacturing of either the in-situ particle composite materials or the composite materials with a core/shell structure and, thus, have a stronger industry application background. They, however, have an essential drawback that just the miscibility gap poses problems during solidification. When an alloy is cooled into the miscibility gap, it decomposes into two liquids enriched with different components. Generally, the liquid-liquid phase transformation leads to a solidification microstructure with a serious phase segregation. We investigated the microstructure formation in a continuously cast immiscible alloy as well as the effect of external electric and magnetic fields. The results demonstrate that the microstructure evolution during the liquid-liquid transformation is a result of the concurrent actions of the nucleation, growth, Ostwald ripening, motions and collision coagulations of the minority phase droplets. The nucleation of the droplets and the convective flow of the melt show a dominant effect on the solidification microstructure. A static magnetic field suppresses the convections in the melt and enhances the homogeneity of the distribution of the minority phase particles in the solidified alloys. Electric current pulses mainly affect the solidification processes and microstructure through changing the nucleation behavior of the minority phase droplets. An immiscible alloy wire with a core/shell microstructure may be obtained by using the continuous casting technique under the effect of a direct current.
报告人简介 赵九洲,博士,中国科学院金属研究所研究员、博士生导师、课题组长,德国宏堡基金获得者,中国科学院百人计划入选者,现为中国颗粒协会等多个学/协会理事,《金属学报》等多个期刊编委。长期以来主要从事合金凝固与相变过程研究和特种材料制备技术研发,获省部级科技进步一等奖1项、二等奖3项,获省部级自然科学二等奖1项,参编专著3本,申报发明专利22项,发表期刊论文170余篇,其中SCI收录论文130余篇。
 
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