摘要
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。
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.
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
关键词
非晶合金
扩散行为
界面
纳米晶
metallic glasses
diffusion behavior
interface
nano-crystal
