Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1564891 | Journal of Nuclear Materials | 2015 | 8 Pages |
Abstract
Nickel and some nickel-base alloys are extremely sensitive to intergranular embrittlement and tellurium (Te) enhanced cracking, which should be concerned during their serving in molten salt reactors. Here, a systematic study about the effects of its temperature on the reaction products at its surface, the intergranular diffusion of Te in its body and its embrittlement for a Ni-16Mo-7Cr alloy contacting Te is reported. For exposed to Te vapor at high temperature (823-1073Â K), the reaction products formed on the surface of the alloy were Ni3Te2, CrTe, and MoTe2, and the most serious embrittlement was observed at 1073Â K. The kinetic measurement in terms of Te penetration depth in the alloy samples gives an activation energy of 204Â kJ/mol. Electron probe microanalysis confirmed the local enrichment of Te at grain boundaries. And clearly, the embrittlement was results from the intergranular diffusion and segregation of element Te.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
Hongwei Cheng, Zhijun Li, Bin Leng, Wenzhu Zhang, Fenfen Han, Yanyan Jia, Xingtai Zhou,