相场法研究含第二相颗粒多晶体系的晶粒粗化标度律

赵彦; 张洪宇; 韦华; 郑启; 金涛; 孙晓峰

doi:10.3724/SP.J.1037.2013.00164

金属学报 >

2013 , Vol. 49 >Issue 8: 981 - 988

DOI: https://doi.org/10.3724/SP.J.1037.2013.00164

论文

相场法研究含第二相颗粒多晶体系的晶粒粗化标度律

赵彦 ,
张洪宇 ,
韦华 ,
郑启 ,
金涛 ,
孙晓峰

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中国科学院金属研究所, 沈阳 110016

赵彦, 男, 1981年生, 博士

收稿日期: 2013-04-07

修回日期: 2013-05-17

网络出版日期: 2013-08-11

基金资助

国家重点基础研究发展计划项目201B631206, 以及国家自然科学基金项目50931004, 51071164和50671102资助

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A PHASE FIELD STUDY FOR SCALING RULES OF GRAIN COARSENING IN POLYCRYSTALLINE SYSTEM CONTAINING SECOND-PHASE PARTICLES

ZHAO Yan ,
ZHANG Hongyu ,
WEI Hua ,
ZHENG Qi ,
JIN Tao ,
SUN Xiaofeng

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Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received date: 2013-04-07

Revised date: 2013-05-17

Online published: 2013-08-11

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摘要

利用相场法研究了第二相颗粒体积分数对多晶体系晶粒粗化标度律的影响. 结果表明:随着第二相颗粒体积分数增加, 晶粒生长阻力增大,晶粒平均半径R_a随时间t的演化关系偏离t=AR_a^m+B非线性关系,且动力学指数m随第二相颗粒体积分数增加而增大.在晶粒粗化阶段,无论第二相颗粒是否存在, 及第二相颗粒体积分数的大小, 系统均满足标度律.随着第二相颗粒体积分数增加, 系统结构因子曲线的峰值逐渐降低,且当波矢k值增大到某一值后, 系统结构因子曲线基本重合;随着第二相颗粒体积分数增加, 系统标度函数峰值降低, 峰宽变宽. 在较大的k值情况下,同一k值对应的标度函数值随第二相颗粒体积分数的增加而增大.由结构因子和标度函数可知, 第二相颗粒体积分数增加, 晶粒间的相互作用减弱,晶粒粗化过程中的尺寸均匀性将更好.

关键词： 相场方法; 粗化动力学; 结构函数; 标度律

本文引用格式

赵彦 , 张洪宇 , 韦华 , 郑启 , 金涛 , 孙晓峰 . 相场法研究含第二相颗粒多晶体系的晶粒粗化标度律[J]. 金属学报, 2013 , 49(8) : 981 -988 . DOI: 10.3724/SP.J.1037.2013.00164

Abstract

The kinetic scaling of the grain coarsening in the polycrystalline system containing the dispersive second-phase particles were studied by phase field method. The obtained results showed that the increase in the volume fraction of second--phase particles enhanced the growth resistance of grain, resulting in the remarkable deviation of the relationship between the average grain radius R_a and the time t from the non-linear relationship t=AR_a^m+B. The kinetic exponent m also increased with the increasing volume fraction of second-phase particles. No matter whether the second-phase particles existed or not in the system studied, the scaling rule had been satisfied at the late stage of grain coarsening. The increase in the volume fraction of the second-phase particles would cause the decrease in the peak value of structure factor profile. When the value of the wave vector k increased to a certain value, the structure factor curve of the studied system was essentially coincident. With the increase in the volume fraction of second-phase particles, The peak values of scaling function decreased and the peak width became wider. According to structure factor and scaling function, it was known that with the increase in the volume fraction of second-phase particles, the interaction among grains weakens and the grain size would become more uniform during the grain coarsening.

Key words： phase field method; coarsening kinetics; structure function; scaling rule

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