Non-equilibrium grain-boundary segregation of Bi in Cu bicrystals

被引：6
|
作者：
Yang, Wu-qiang [1 ]
Xu, Min [1 ]
Liang, Jian-xiong [2 ]
Meng, Ye [1 ]
Zheng, Lei [1 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Cent Iron & Steel Res Inst, Inst Special Steels, Beijing 100081, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2014年 / 24卷 / 12期
基金：
中国国家自然科学基金;
关键词：
bismuth; copper; segregation; grain boundary; diffusion; INTERMEDIATE TEMPERATURE EMBRITTLEMENT; APPLIED TENSILE-STRESS; SELF-DIFFUSION; PHOSPHORUS; MECHANISM; KINETICS; NI;
D O I：
10.1016/S1003-6326(14)63566-4
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The observations of grain-boundary segregation of Bi in Cu bicrystals were analyzed. According to equilibrium grain boundary segregation (EGS) model and non-equilibrium grain-boundary segregation (NGS) model, respectively, the segregation kinetics of isothermal annealing at 500 degrees C and that of isochronal annealing for 24 h of Bi in Cu bicrystals were investigated. By qualitative analysis and quantitative analysis, it is concluded that the grain-boundary segregation of Bi agrees well with the theory of NGS. Based on the kinetics model of NGS, some parameters that are useful to predicting and controlling the Bi-induced embrittlement in Cu alloys are calculated as follows: the diffusion coefficient of Bi-vacancy complexes D-c=7.8x10(-5)exp[-1.46/(kT)]; the apparent diffusion coefficient of Bi atoms D-A(i)= 7.66x10(at+b)exp[-1.76/(kT)], where a=8.45x10(-8) and b=-13.37.
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页码：4038 / 4043
页数：6
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