CAJ | 학술논문

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DiA=7.66×10at+bexp[?1.76/(kT)]，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。
대Bi재Cu쌍정중적정계편취실험관찰결과진행분석。이용평형정계편취(EGS)모형화비평형정계편취(NGS)모형，분별대500°C시Bi재Cu쌍정중적등온편취동역학화퇴화24 h적등시편취동역학진행연구。종정성분석화정량계산분석량방면추단출 Bi 적정계편취특정여비평형편취이론십분부합。근거비평형정계편취이론동역학모형，계산득도 Bi?공위복합체확산계수 Dc=7.8×10?5exp[?1.46/(kT)]，이급 Bi 원자적표관확산계수DiA=7.66×10at+bexp[?1.76/(kT)]，기중，a=8.45×10?8，b=?13.37。저사수거유조우대Cu합금중Bi소도치적취화진행예측화공제적연구。
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 DiA=7.66×10at+bexp[–1.76/(kT)], where a=8.45×10?8 and b=?13.37.