Numerical Study on the Impact of Cooling Rate on the Solidification of Al-Bi Hypermonotectic Alloys

摘要：

　　A numerical model describing the liquid-liquid phase transformation of the nucleation, the diffusional growth, Ostwald coarsening and macro-transport phenomena was established based on Euler-Euler method.The microstructure development of Al-Bi alloys in different solidification rate has been simulated by coupling the calculated temperature and velocity fields with the kinetic equation which controls the microstructure evolution.The results showed that average diameter difference of L2 phase droplets between top and bottom of samples in low cooling rate increased by 151% than in high cooling speed and the maximum volume fraction of the droplets at the bottom of the sample in low cooling rate much higher than in high cooling rate.Analysis that the bigger cooling rate can shorten the action time which caused by gravity settling and collisions coagulation of the droplets, and then improves the macrosegregation of solidification structure in favor of uniform distribution of the solidification structure.

关键词： Al-Bi Hypermonotectic Numerical Analysis Cooling Rate Solidification Microstructure

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: 111-116

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）