非晶一次晶化过程微观组织演化和生长动力学的相场法研究  

Morphological Evolution and Growth Kinetics in Primary Crystallization of Amorphous:Phase Field Method

作　　者：王进 马文婧 刘玉周 吕美妮 张开靖 WANG Jin;MA Wenjing;LIU Yuzhou;LYU Meini;ZHANG Kaijing(Guangxi Key Laboratory of Machine Vision and Intelligent Control,Wuzhou,Guangxi 543002,China;School of Electronic and Information Engineering,Wuzhou University,Wuzhou,Guangxi 543002,China;School of Mechanical and Material Engineering,Wuzhou University,Wuzhou,Guangxi 543002,China)

机构地区：[1]广西机器视觉与智能控制重点实验室,广西梧州543002 [2]梧州学院电子与信息工程学院,广西梧州543002 [3]梧州学院机械与材料工程学院,广西梧州543002

出　　处：《计算物理》2022年第4期403-410,共8页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(51765060);中央引导地方科技发展资金;广西科技基地和人才专项(桂科AD20238053);广西高校中青年教师科研基础能力提升项目(2019KY0691,2020KY17010);梧州学院重大项目(2017A004,2017A005)资助

摘　　要：在晶化物理模型中添加扩散系数对晶化过程的影响,采用相场方法研究初始形核率和初始形核半径对一次晶化过程中微观组织和生长动力学的影响。结果表明:随着初始形核率的增加,相同时间内非晶一次晶化的晶粒数量逐渐增加,晶粒尺寸逐渐减小。晶化分数随着演化时间和初始形核率的增加逐渐增大,初始形核率越大,相同演化时间内的晶化分数越高。不同初始形核半径情况下,非晶一次晶化过程中的晶粒数量和尺寸随着演化时间的增加基本保持不变。晶化分数随着演化时间的增加而增大。不同初始形核率和初始形核半径情况下所对应的生长指数均小于1,表明初始形核率和初始形核半径对晶化方式无影响,均为一次晶化。改变初始形核率和初始形核半径可调控一次晶化微观组织结构,而晶粒尺寸及晶化分数直接关系到合金性能。Influence of diffusion coefficient on crystallization process is considered in a crystallization physical model.A phase field method is employed to study influence of random nucleation rates and nucleation radii on microstructure and growth kinetics in primary crystallization process.It shows that the number of grain crystal of primary crystallization increases with the increase of initial nucleation rate,and the crystal size of primary crystallization decreases with the increase of initial nucleation rate.The crystallization fraction increases with evolution time and initial nucleation rate.The greater the initial nucleation rate,the higher the crystallization fraction.With different initial nucleation radii,the quantity and size of grains in the primary crystallization process remains basically unchanged with the increase of evolutionary time.The crystallization fraction increases with the increase of evolutionary time.The growth index corresponding to different initial nucleation rates and initial nucleation radii is less than 1,which means random nucleation rate and random nucleation radius have no significant effect on the crystallization mode.The crystallization modes are primary crystallization.Control of random nucleation rate and initial nucleation radius changes effectively microstructure of the primary crystallization.The grain size and crystallization fraction affect properties of the alloy directly.

关 键 词：一次晶化 相场方法 生长动力学 初始形核率 初始形核半径 

分 类 号：TG139.8[一般工业技术—材料科学与工程]