Abstract
The effect of lanthanum (La) addition on the tellurium (Te) induced embrittlement of Ni-16Mo-7Cr alloy was studied in this work. The addition of La element can significantly decrease the diffusion depth of Te into the alloy, and hence the alloys’ intergranular cracking resistance. Although no lanthanum telluride is observed during the interaction between Te and the alloy, the segregation of La in the surface telluride reaction layer and intermetallic compound of LaNi5 at grain boundaries can promote the formation of nickel tellurides, which contributes for the reduced Te diffusion depth in the La-modified alloys.
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