Effect of Al addition on intergranular embrittlement behavior of GH3535 alloy induced by fission product Te.

The effect of Al addition on Te diffusion behavior of a Ni-16Mo-7Cr base superalloy was investigated at 800 °C for 100 h. The results show that Ni 3 Te 2 and Cr 3 Te 4 are the mainly reaction products formed on the surface of Al-modified alloy. Although no aluminum telluride is detected both on the surface and in the alloy, the addition of Al promotes the formation of compact and continuous Cr 3 Te 4 layer on the surface, which effectively inhibits the diffusion of Te into the alloy. Moreover, Al can also promote the γ' phase formation, and thus improve the tensile property of the alloy significantly. • Effect of Al on intergranular embrittlement behavior of GH3535 alloy in Te vapor was investigated. • Al addition can significantly decrease the diffusion depth of Te into the alloy. • Al addition can promote the formation of Cr 3 Te 4 in the reaction layer. • The optimum content of Al should be 1 % in the alloy. [ABSTRACT FROM AUTHOR]