金属基复合材料原位反应相场模型  

A phase-field model for in-situ reaction process of metal-matrix composite materials

作　　者：郭灿 康晨瑞 高莹 张一弛 邓英远 马超 徐春杰[1] 梁淑华[1] Guo Can;Kang Chen-Rui;Gao Ying;Zhang Yi-Chi;Deng Ying-Yuan;Ma Chao;Xu Chun-Jie;Liang Shu-Hua(School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China;Material Research Center,CITIC Dicastal Co.,Ltd,Qinhuangdao 066000,China)

机构地区：[1]西安理工大学材料科学与工程学院,西安710048 [2]中信戴卡股份有限公司材料研究中心,秦皇岛066000

出　　处：《物理学报》2022年第9期257-265,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51801154,51834009);陕西省高等学校学科创新引智基地(批准号:S2021-ZC-GXYZ-0011);西安市高校重大科技创新平台及科技成果就地转化项目(批准号:20GXSF0003)资助的课题。

摘　　要：原位反应法制备金属基复合材料具有增强体与基体间无杂质、无污染、颗粒分布均匀等优点,已成为制备金属基复合材料的一种重要方法,揭示其动力学机制及规律具有重要的理论及工业价值.然而,原位反应过程具有反应时间短、随机发生、温度高等特点,目前采用原位实验观测其反应过程仍存在较大困难.本文采用相场法模拟金属熔体内的原位反应过程,首先建立了能够描述双束金属熔体界面反应形核的相场模型,并采用该模型模拟了不同参数下相界反应形核过程.结果表明,形核率随着曲率半径及噪声强度的增大而增大,小曲率半径及强噪声条件下新相颗粒尺寸分布更加均匀,形核率随着过冷度的增大而先增大后减小.The in-situ reaction is an important method of preparing metal matrix composites:it can produce more uniform distribution of the reinforcement particles and more excellent structure of the phase boundary between the particles and the matrix.Therefore,the kinetics of in-situ reaction process deserves to be further studied.However,as the in-situ reaction is a rapid random process under high-temperature condition,it is difficult to observe the reaction process of metal-matrix composite materials experimentally.In this work,we propose a new phase-field model to describe the in-situ reaction process,and investigate the nucleation kinetic processes of in-situ reaction under different physical conditions.We find that the nucleation rate increases with the augment of curvature radius and noise intensity,and the size distribution of the particles is more uniform under the conditions of a small curvature radius and strong noise.With the increase of the undercooling,the nucleation rate first increases and then decreases,which is consistent with the classical nucleation theory.

关 键 词：相场法 原位反应 形核 相变 

分 类 号：TB33[一般工业技术—材料科学与工程]