Effect of yttrium on intergranular embrittlement behavior of GH3535 alloy induced by tellurium

The influence of yttrium (Y) addition on the tellurium (Te) induced intergranular embrittlement of Ni-16Mo-7Cr alloy was investigated. The results show that the addition of Y remarkedly reduces the diffusion depth of Te into the alloy, and thus improves the intergranular cracking resistance of the alloy. The YTe phases on the surface reaction layer and near-surface grain boundaries, plays an important role in fixing Te and slowing down the Te diffusion. Adding more than 0.05 wt% Y into the alloy does not continuously improve the intergranular embrittlement resistance, and even damages the mechanical properties.