Abstract

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 Ni3Te2 and Cr3Te4 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 Cr3Te4 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.

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