Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 29    No. 2    February 2019

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Self-organized layered growth phenomena of diffusion couples with spinodal decomposition in binary alloys
Yong LU1,2, Yuan-yuan CUI1, Qiao-qiao TANG1, Cui-ping WANG1,2, Zhen-bang WEI1, Shui-yuan YANG1,2, Xing-jun LIU1,2

1. College of Materials, Xiamen University, Xiamen 361005, China;
2. Fujian Key Laboratory of Materials Genome, Xiamen University, Xiamen 361005, China

Abstract:In order to investigate the formation mechanisms of the layered growth phenomena in diffusion couples with spinodal decomposition, a phase field model combined with elastic strain field was employed. Microstructure evolutions of diffusion couple with spinodal decomposition in binary alloys were numerically simulated by considering concentration fluctuation and elastic anisotropy. The simulation results indicate that the number of the periodical layers decreases with the increase of initial concentration fluctuation, even with large elastic anisotropy. The growth of layered microstructures can be attributed to the directional diffusion enhanced by initially discontinuous chemical potential at the interface.

 

Key words: spinodal decomposition; concentration fluctuation; phase field method; layered structure; diffusion couple

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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