期刊论文

Grain growth in a nanostructured AZ31 Mg alloy containing second phase particles studied by phase field simulations

Wu, Yan

英文

中国科学：材料科学(英文版)

2095-8226

2016

59

5

355-362

10.1007/s40843-016-5036-4

National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [U1302272]

本校为第一且通讯机构

Phase field models were established to simulate the grain growth of a nanostructured AZ31 magnesium alloy, which contain spherical particles of differing sizes and volume fractions, under realistic spatial and temporal scales. The effect of the second phase particles on the nanostructure evolution was studied. The simulated results were compared with those of the conventional microstructured alloy. The expression of the local free energy density was improved by adding a second phase particle term. The right input parameters were selected for pr...

本文建立了一个真实时空的相场模型模拟,研究了含不同尺寸和体积分数的球形第二相颗粒的纳米结构AZ31镁合金的晶粒生长过程;第二相颗粒对单相合金系统晶粒组织演化和生长动力学的影响;并将模拟结果与微米晶结构镁合金的模拟结果相比较.通过在自由能密度函数的表达式中增加第二相颗粒的表达来改进模型.模拟结果表明:纳米晶组织中第二相粒子对晶粒长大的钉扎作用,与对微米晶组织下的作用有很大区别.纳米结构中,第二相颗粒对晶粒长大影响存在一个粒子尺寸的临界值,当第二相颗粒体积分数为10%时,粒子尺寸的临界值为200 nm,随粒子含量增加,临界尺寸值将减小.另一方面,粒子含量越大对晶界钉扎作用越大...