(北京航空材料研究院, 北京 100095)
摘 要: 研究了Al在含Re的Ni基合金中的扩散行为。 结果表明: Al在Ni基体中的扩散激活能随着Re含量的增加而增加, 在Re质量分数为1%, 2%和3%的Ni中Al的扩散激活能分别为230,238和256kJ/mol; 温度低于(1170±5)℃的时候, Al在Ni基体中的扩散速率随着Re含量的增加而减小, Re阻碍Al原子在Ni基体中的扩散; 而在高于(1170±5)℃的时候, Al在Ni基体中的扩散速率随Re含量的增加而增加;(1170±5)℃是一个转折点, 在此温度, Al在不同Re含量的Ni基体中的扩散速率几乎相等。
关键字: 扩散; 铼; 铝; 镍基高温合金
(Beijing Institute of Aeronautical Materials, Beijing 100095, China)
Abstract:The diffusion behaviors of aluminium in nickel with rhenium were studied. The results show that, the activation energy of aluminium diffusion in nickel increases with the increase of rhenium content, the activation energies of aluminium diffusion in nickel with rhenium of 1%, 2% and 3%(mass fraction) are 230, 238 and 256kJ/mol respectively; below (1170±5)℃, the diffusion velocity of aluminium in nickel decreases with the increase of rhenium contnet, which implies that the rhenium impedes the aluminium diffusing in nickel; above (1170±5)℃, the diffusion velocity of aluminium in nickel increases with the increase of rhenium contnet; (1170±5)℃ is a temperature of turning range, at which the diffusion velocities of aluminium in nickel with different content of rhenium are similar.
Key words: diffusion; rhenium; aluminium; nickel base superalloy