Microstructure evolution of immiscible alloys during rapid cooling through miscibility gap

来源期刊：中国有色金属学报(英文版)2002年第2期

论文作者：刘源 郭景杰 贾均 李言祥 赵九洲

文章页码：193 - 199

Key words：immiscible alloy; coarsening of second phase; numerical model

Abstract: A numerical model was developed to describe the coarsening of the second phase droplets under the common action of nucleation, diffusional growth and Brownian collision between minority phase droplets during rapidly cooling a hypermonotectic alloy through its miscibility gap. The simulated results show that Brownian mot ion is an important factor influencing the coarsening process. A faster cooling rate leads the supersaturation of the matrix liquid and the nucleation rate to grow up to a higher level, but leads to a smaller droplet radius and a higher number density. This model is used to predict the microstructural evolution of melt-spun Al-30%In ribbon. The model reflects the real physical processes well and is expected to be applicable to other immiscible alloys or other preparing processes.