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Development of Thin Aluminide Coatings on Alloy 800 Substrate

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Applications of Microscopy in Materials and Life Sciences

Part of the book series: Springer Proceedings in Materials ((SPM,volume 11))

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Abstract

Magnetron sputtering using aluminium as a target material was employed on Fe–Ni–Cr containing austenitic Alloy 800 substrates. Electron microscopic examination with elemental analysis on magnetron-sputtered substrates indicated formation of ~1.0 µm thick oxygen-rich Al–Fe–Ni–Cr containing layer just below the uppermost aluminium-rich deposited layer. Magnetron-sputtered + thermally–treated (1273 K for 18 h) substrates revealed formation of thin (~5 µm) aluminide layers at the upper surface comprising primarily Fe–Al rich layer with adjoining layers of Fe–Ni-Cr–Al type followed by Ni–Al rich layer. Thin multilayered alloy substrate exhibited microhardness value of ~405 (±15) Vickers hardness number (VHN) while for alloy substrate, that was recorded as 310 (±10) VHN. The scratch test conducted on thin multilayered alloy substrate in the load range of 1–10 N indicated friction coefficient and penetration depth of ~0.1 and 11 µm, respectively. A good adherence was recorded for thin layers as no peeling off was noticed, which was confirmed by acoustic emission signals. The exposure of magnetron-sputtered + thermally treated alloy substrates to 70% K2SO4 + 30% KCl salts at 973 K in air revealed retention of surface oxide predominantly composed of Al–Fe–Cr–Ni type oxide layer indicating its good resistance to aggressive environment.

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Acknowledgements

The authors wish to thank AD, Materials Group, Head, MSD, and Head, MP&CED, Bhabha Atomic Research Centre, Trombay, Mumbai, India, for their supports during this work.

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The work was funded by DAE, Government of India.

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Correspondence to R. S. Dutta .

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Dutta, R.S., Mishra, P., Singh, V., Singh, K. (2021). Development of Thin Aluminide Coatings on Alloy 800 Substrate. In: Ghosal, P., Carter, C.B., Vinothkumar, K.R., Sarkar, R. (eds) Applications of Microscopy in Materials and Life Sciences. Springer Proceedings in Materials, vol 11. Springer, Singapore. https://doi.org/10.1007/978-981-16-2982-2_2

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