摘要
第二相颗粒对晶界有很强的钉扎作用,大量第二相颗粒的存在将影响系统正常的晶粒长大过程。本文采用相场法研究了第二相颗粒尺寸大小和体积分数对晶粒长大过程的影响。模拟结果表明第二相颗粒体积分数越大,对晶界的钉扎作用越强,稳态时晶粒尺寸越小。第二相颗粒体积分数达到一定范围时可能发生个别晶粒的异常长大。单个第二相颗粒尺寸越大,其对晶界钉扎作用越强,但当体积分数一定时第二相颗粒尺寸越小,总的钉扎效果越强,最终系统的晶粒尺寸越小。通过相场模拟获得了极限晶粒尺寸与第二相颗粒参数的定量关系,相场模拟结果与实验结果和MonteCarlo模拟结果相符合。
The presence of second-phase particles can influence the evolution of solidification structure and change the grain growth. In this work, a phase field model is used to analyze the effect of the size and the volume fraction of the second-phase particles on the grain growth. The simulation results show that the pinning effect is enhanced with increasing the size and the volume fraction of the second-phase particles. Abnormal grain growth may happen in certain range of the volume fraction of the second-phase particles. The final grain size reduces with the decreasing of the size of the second-phase particles when the volume fraction is fixed. A quantitative relation between the limited grain size and the parameters of the second-phase particles was obtained from phase field simulation, and the present results are consistent with experiments and Monte Carlo simulations.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第10期1746-1750,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金项目(50401013)
西北工业大学博士创新基金
关键词
相场法
晶粒长大
第二相颗粒
phase-field method
grain growth
second-phase particles
