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作 者:杨武强[1] 徐敏[1] 梁剑雄[2] 孟晔[1] 郑磊[1]
机构地区:[1]北京科技大学材料科学与工程学院,北京100083 [2]钢铁研究总院特殊钢研究所,北京100081
出 处:《Transactions of Nonferrous Metals Society of China》2014年第12期4038-4043,共6页中国有色金属学报(英文版)
基 金:Project(51001011)supported by the National Natural Science Foundation of China;Project(141043)supported by the Fok Ying-Tong Education Foundation,China;Project(FRF-TP-12-042A)supported by the Fundamental Research Funds for the Central Universities,China
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 °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 Dc=7.8×10^-5exp[-1.46/(kT)];the apparent diffusion coefficient of Bi atoms Di^A=7.66×10^at+bexp[–1.76/(kT)], where a=8.45×10^-8 and b=-13.37.对Bi在Cu双晶中的晶界偏聚实验观察结果进行分析。利用平衡晶界偏聚(EGS)模型和非平衡晶界偏聚(NGS)模型,分别对500°C时Bi在Cu双晶中的等温偏聚动力学和退火24 h的等时偏聚动力学进行研究。从定性分析和定量计算分析两方面推断出Bi的晶界偏聚特征与非平衡偏聚理论十分符合。根据非平衡晶界偏聚理论动力学模型,计算得到Bi-空位复合体扩散系数Dc=7.8×10-5exp[-1.46/(kT)],以及Bi原子的表观扩散系数DAi=7.66×10at+bexp[-1.76/(k T)],其中,a=8.45×10-8,b=-13.37。这些数据有助于对Cu合金中Bi所导致的脆化进行预测和控制的研究。
关 键 词:BISMUTH copper SEGREGATION grain boundary diffusion
分 类 号:TG146.11[一般工业技术—材料科学与工程] TG111[金属学及工艺—金属材料]
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