Abstract
Pack aluminization of Ni-based superalloy 690 substrates in low-Al pack at 1273 K resulted in formation of NiAl on the topmost surface and nickel aluminides as adjoining layers. Cross-sectional transmission electron microscopy of NiAl revealed formation of nanoparticles of NiAl. Adherence test conducted at 3 N load along the cross-section of aluminized substrate did not exhibit any peeling off at the interlayer. First-principle calculations performed on Cr-doped Ni(111)/NiAl(110) interface showed an ideal work of adhesion value of 3524 mJ/m2 indicating fairly strong adhesion. SEM–EDS analysis along the cross-section of aluminized and oxidized (1273 K in air) substrate revealed formation of aluminium oxide on nickel aluminide. SEM–EDS analysis of oxidized nickel aluminide layer that was exposed to borosilicate melt at 1248 K for 192 h revealed fairly good stability of aluminide but presence of some phase comprising Al, Ni, O, Cr at certain locations of aluminide/glass interface was noticed.
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Acknowledgments
The assistance provided by Dr. B. Paul of MPD, Dr. K. Singh of FRMS and Dr. R. K. Mishra of WMD, BARC during the course of this study is gratefully acknowledged. The work was funded by Department of Atomic Energy, Government of India.
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C. Yusufali was Research Fellow at the time of work.
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Dutta, R.S., Yusufali, C., Tewari, R. et al. Characterization of Nickel Aluminide Formed on Ni-Based Superalloy 690 Substrate, First-Principle Ni(Cr)/NiAl Interface Simulations and Stability of Aluminide in Aggressive Environment in Pre-oxidized State. Trans Indian Inst Met 69, 1889–1897 (2016). https://doi.org/10.1007/s12666-016-0848-1
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DOI: https://doi.org/10.1007/s12666-016-0848-1