第二相颗粒体积分数对AZ31镁合金微观组织影响的相场模拟研究  

Study of the volume fraction of the second-phase particles in the microstructure of AZ31 magnesium alloy by the phase field methods

作　　者：吴艳 熊锦林 熊晓华 曾如铁 WU Yan;XIONG Jin-lin;XIONG Xiao-hua;ZENG Ru-tie(School of Mechanical Engineering,Wuhan Polytechnic University,Wuhan 430023,China;Yichun Open University,Yichun 336000,China)

机构地区：[1]武汉轻工大学机械工程学院,武汉430023 [2]宜春开放大学,宜春336000

出　　处：《武汉轻工大学学报》2022年第2期58-64,共7页Journal of Wuhan Polytechnic University

基　　金：武汉轻工大学科研项目(2021Y31).

摘　　要：为研究第二相颗粒体积分数对于AZ31镁合金微观组织的影响,采用相场法模拟研究了350℃退火温度下AZ31镁合金微观组织的变化。研究结果表明:第二相颗粒的引入会使得材料微观组织产生相应程度的细晶强化,并且这种强化现象会随着第二相颗粒体积分数的升高而逐渐明显直至趋于稳定;第二相颗粒尺寸大小r为2μm时,颗粒体积分数对于晶界的钉扎作用存在极小、极大临界值,分别为f_(min) 0.5%、f_(max) 40%。且体积分数临界值与其尺寸大小呈正相关。并将模拟结果与实验结果进行对照,两者相吻合。In order to study the effect of the volume fraction of second-phase particles on the microstructure of AZ31 magnesium alloy,the changes of the microstructure of AZ31 magnesium alloy at annealing temperature of 350 were investigated by using the phase-field method.The results show that the introduction of the second-phase particles results in a corresponding degree of fine-grained strengthening of the material microstructure,and this strengthening phenomenon will gradually become obvious with the increase of the volume fraction of the second-phase particles until it stabilizes.It is found that the volume fraction of the second-phase particles with size r is 2μm has minimal and maximal critical values of f_(min) is 0.5%and f_(max) is 40%,respectively,and the critical value of volume fraction is positively correlated with its size.And the simulation results are compared with the experimental results,and they agree with each other.The study can provide a reference for the particle content in the preparation of particle-reinforced Mg matrix composites.

关 键 词：相场法 第二相颗粒 晶粒长大 钉扎作用 AZ31镁合金 

分 类 号：TG111[金属学及工艺—物理冶金]