摘要
基于相场法,以第二相颗粒平衡体积分数不同的合金为对象,研究第二相颗粒的沿晶析出、长大及其对基体相晶界的钉扎作用。结果表明,第二相颗粒的平衡体积分数越大,其形核孕育期越短,形核与粗化的速度也越快;然而在第二相颗粒的长大阶段,平衡体积分数较大(15%～25%)时第二相颗粒长大速度较慢,而平衡体积分数较小(10%)时则长大速度较快。随着第二相颗粒平衡体积分数的增大,其对晶界的钉扎作用也逐渐增强,但平衡体积分数增大到一定程度,钉扎作用将趋于稳定。第二相颗粒对晶粒极限尺寸的影响遵循Zener关系。
Alloys containing different equilibrium volume fraction of second-phase particles were studied based on phase field model.The second-phase particle precipitating at grain boundaries and the growth were also investigated as well as its pinning effect on matrix phase grain boundaries.The simulation result indicates that the more the equilibrium volume fraction of second-phase particles is,the shorter the nucleation incubation period becomes,and the quicker the rate of nucleation and coarsening becomes.However,during the growth stage,the second-phase particles with high equilibrium volume fraction（15%～25%） grow more slowly than that with low fraction（10%）.The pinning effect on grain boundaries increases along with the higher equilibrium volume fraction of second-phase particles.However,when the equilibrium volume fraction increases to a certain degree,the pinning effect will tend to be stable.The effect of second-phase particles on the final grain radius follows Zener relation.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第10期1751-1755,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51075335
10902086
50875217)
西北工业大学基础研究基金
关键词
相场法
第二相颗粒
析出
晶粒长大
phase field model
second-phase particles
precipitate
grain growth
