Hf在Ni和Ni_3Al中的扩散行为

DIFFUSION BEHAVIOUR OF Hf IN Ni AND Ni_3Al

用含Ｈｆ的中间层合金钎接或暂存液相连接单晶高温合金时，为了使Ｈｆ尽快地由焊缝区向母体合金扩散，研究了Ｈｆ在基体相Ｎｉ（γ）和Ｎｉ３ＡＩ（γ′）中的扩散行为，并算出扩散系数和扩散激活能，找到了扩散系数与温度、浓度的关系。

The Hf-containing alloy was selected as a interlayer for brazing and Transient-Liquid-Phase(TLP) bonding of single crystal superalloy, in which element Hf should diffuse as quickly as possible from bond to matrix phase. The objective of this investigation is to determine the diffusion behaviour of Hf in two matrix phases of superalloy,the Ni-rich solid solution(y)and intermetallic compound(Ni3Al). In present work,the diffusion coefficient, diffusion activity energy in two matrix phases, and their relation with temperature and Hfcontent are reported, which are useful to select a proper bonding condition.