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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Microstructure evolution of immiscible alloys
 during rapid cooling through miscibility gap
LIU Yuan(刘  源)1,2,GUO Jing-jie(郭景杰)1, JIA Jun(贾  均)1
LI Yan-xiang(李言祥)2, ZHAO Jiu-zhou(赵九洲)3

1.School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China;
2.Department of Mechanical Engineering, Tsinghua University,
Beijing 100084, China;
3.Institute of Metal Research, The Chinese Academy of Science,
Shenyang 110015, China

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.

 

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

ISSN 1672-7029
CN 43-1423/U

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