Experimental Study on the Impact of Macrosegregation Formation of the Al-Bi Hypermonotectic Alloys

摘要：

　　The solidification experiments about macrosegregation formation of the Al-10%Bi hyper monotectic alloys under gravity conditions have been carried out.The results showed that the average diameter of the Bi-rich droplets linearly increases and the number density of the Bi-rich droplets exponentially decreases with solidification time under the gravity condition.Because of gravity settling and collisions coagulation between the droplets, area fraction of Bi-rich increased rapidly in the bottom of samples during early solidification.Its easy to form Bi-rich layer at the bottom of the sample.The analysis demonstrates that nucleation and diffusion growth of drops are the dominant factors influencing the solidification microstructure during the early solidification and the same distribution of Bi-rich in different locations of sample.As the solidification process, gravity migration and collision coagulation beginning to play the leading role, lead to the difference in the distribution of Bi-rich droplets in different locations of sample increases gradually in the same time.It caused macrosegregation of the final solidification microstructure under the gravity condition.

关键词： Gravity Al-Bi Hypermonotectic Microsegregation Solidification

作者: Zhi-qiang Kang Xue Yang Guo-hui Feng Lin Zhang

作者单位: School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, Chi Key Laboratory of Electromagnetic Processing of Material of Ministry of Education, Northeastern Univ

会议类型: 国际会议

会议名称: The 2016 China Functional Materials Technology and Industry Forum (2016中国国际功能材料大会暨第九届中国功能材料及其应用学术会议)

会议地点: 重庆

会议语种:英文

页码: 106-110

在线出版日期: 2016-07-25（万方平台首次上网日期，不代表论文的发表时间）