摘要
以Cu-Bi-Sn相分离合金为对象,试验与模拟相结合,研究了脉冲电流对相分离合金连续凝固组织演变的影响。结果表明,脉冲电流主要通过改变液-液相变过程中弥散相液滴的形核能垒来影响相分离合金的凝固过程及组织。随着电流密度峰值增加,液-液相变过程中弥散相液滴的形核能垒降低,液滴形核率增加,合金凝固组织中弥散相粒子的尺寸减小,有利于弥散型相分离合金复合材料的制备。
The continuous solidification behavior of Cu-Bi-Sn immiscible alloys under electric current pulses(ECPs),and the affecting mechanisms of ECPs on the microstructure evolution of immiscible alloys were investigated experimentally and numerically.The results demonstrate that the ECPs affect the solidification process and microstructure of immiscible alloys by changing the nucleation barrier of the minority phase droplets(MPDs)during liquid-liquid phase transformation.With the increase of peak current density,the nucleation barrier is decreased,and nucleation rate of droplets is increased.The dimension of dispersed phase particles in the alloy is decreased,which is conducive to the formation of well-dispersed microstructure.
作者
江鸿翔
赵浩宇
李彦强
赵九洲
张丽丽
何杰
Jiang Hongxiang;Zhao Haoyu;Li Yanqiang;Zhao Jiuzhou;Zhang Lili;He Jie(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences;School of Materials Science and Engineering,University of Science and Technology of China;School of Rare Earths,University of Science and Technology of China;Ganjiang Innovation Academy,Chinese Academy of Sciences)
出处
《特种铸造及有色合金》
CAS
北大核心
2022年第12期1480-1485,共6页
Special Casting & Nonferrous Alloys
基金
中科院战略性先导专项资助项目(XDC04030502)
国家自然科学基金资助项目(51971227,51974288,52174380)
福建省科技计划资助项目(2020T3037)
中国载人航天工程空间应用系统资助项目(KJZ-YY-NCL06)
关键词
相分离合金
脉冲电流
连续凝固
形核
Immiscible Alloys
Electric Current Pulses
Continuous Solidification
Nucleation
