中国物理B ›› 2015, Vol. 24 ›› Issue (12): 126401-126401.doi: 10.1088/1674-1056/24/12/126401

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Effects of temperature gradient on the interface microstructure and diffusion of diffusion couples: Phase-field simulation

李永胜, 吴兴超, 刘苇, 侯志远, 梅浩杰   

  1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • 收稿日期:2015-04-16 修回日期:2015-08-14 出版日期:2015-12-05 发布日期:2015-12-05
  • 通讯作者: Li Yong-Sheng E-mail:ysli@njust.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51571122) and the Fundamental Research Funds for the Central Universities, China (Grant No. 30920130121012).

Effects of temperature gradient on the interface microstructure and diffusion of diffusion couples: Phase-field simulation

Li Yong-Sheng (李永胜), Wu Xing-Chao (吴兴超), Liu Wei (刘苇), Hou Zhi-Yuan (侯志远), Mei Hao-Jie (梅浩杰)   

  1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2015-04-16 Revised:2015-08-14 Online:2015-12-05 Published:2015-12-05
  • Contact: Li Yong-Sheng E-mail:ysli@njust.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51571122) and the Fundamental Research Funds for the Central Universities, China (Grant No. 30920130121012).

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摘要： The temporal interface microstructures and diffusions in the diffusion couples with the mutual interactions of the temperature gradient, concentration difference and initial aging time of the alloys are studied by phase-field simulation, and the diffusion couples are produced by the initial aged spinodal alloys with different compositions. Temporal composition evolution and volume fraction of the separated phase indicate the element diffusion direction through the interface under the temperature gradient. The increased temperature gradient induces a wide single-phase region on two sides of the interface. The uphill diffusion proceeds through the interface, no matter whether the diffusion direction is up or down with respect to the temperature gradient. For an alloy with short initial aging time, phase transformation accompanying the interdiffusion results in the straight interface with the single-phase regions on both sides. Compared with the temperature gradient, composition difference of diffusion couple and initial aging time of the alloy show greater effects on diffusion and interface microstructure.

关键词: interface, diffusion, temperature gradient, phase-field

Abstract: The temporal interface microstructures and diffusions in the diffusion couples with the mutual interactions of the temperature gradient, concentration difference and initial aging time of the alloys are studied by phase-field simulation, and the diffusion couples are produced by the initial aged spinodal alloys with different compositions. Temporal composition evolution and volume fraction of the separated phase indicate the element diffusion direction through the interface under the temperature gradient. The increased temperature gradient induces a wide single-phase region on two sides of the interface. The uphill diffusion proceeds through the interface, no matter whether the diffusion direction is up or down with respect to the temperature gradient. For an alloy with short initial aging time, phase transformation accompanying the interdiffusion results in the straight interface with the single-phase regions on both sides. Compared with the temperature gradient, composition difference of diffusion couple and initial aging time of the alloy show greater effects on diffusion and interface microstructure.

Key words: interface, diffusion, temperature gradient, phase-field

中图分类号:  (General studies of phase transitions)

  • 64.60.-i
64.75.Nx (Phase separation and segregation in solid solutions) 66.30.Fq (Self-diffusion in metals, semimetals, and alloys) 68.35.bd (Metals and alloys)