摘要
Diffusion behavior of Ni in Zr48Cu36Ag8Al8 metallic glass was investigated in the temperature range of 683-723 K by secondary ion mass spectrum(SIMS) and transmission electron microscope(TEM). The diffusivity of Ni in Zr48Cu36Ag8Al8 is reasonably fitted by a single Arrhenius relation with small effective activation energy. The diffusivity of Ni in Zr48Cu36Ag8Al8 is an instantaneous function of annealing time in the supercooled liquid region. In addition, a large number of nano-crystals are detected near the interface of Ni-Zr48Cu36Ag8Al8 diffusion couple, and its width is broader than the Ni diffusion depth determined by SIMS. The results indicate that atomic inter-diffusion is an important factor to promote the formation of nano-crystals within the diffusion zone.
采用二次离子质谱(SIMS)以及透射电镜(TEM)研究在683~723 K温度范围内Ni原子在Zr48Cu36Ag8Al8非晶合金中的扩散行为。在过冷液相区内,Ni原子在Zr48Cu36Ag8Al8非晶合金中的扩散系数满足单一的Arrhenius关系式,具有较低的激活能,在过冷液相区内其扩展数系数是一个随退火时间变化的函数。此外,在界面附近有大量的纳米晶形成,其宽度大于通过二次离子质谱检测到的Ni原子扩散深度。结果表明:原子互扩散是促使界面纳米晶形成的重要因素。
基金
Project(JC20120203)supported by the Fundamental Research Fund of Northwestern Polytechnical University,China
Project(B08040)supported by the Program of Introducing Talents of Discipline to Universities,China
