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Microstructural Evolution of Oxide and Nitride Dispersed Nickel-Based Alloy Powders

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Abstract

The microstructural evolution of oxide and nitride dispersed nickel-based mechanical alloyed (MA) powders was investigated using in situ characterization methods, including high-temperature X-ray diffraction and transmission electron microscope (TEM). MA powders strengthened by Si3N4 and Er2O3 exhibited different behaviors. The added Si3N4 particles were not dissolved during the MA process, resulting in faster strain recovery and grain coarsening in the MA powders. In contrast, the Er2O3 particles were dissolved into the matrix during the MA process. Also, precipitation of Er2Ti2O7 particles with an average size of 10 nm was observed by in situ TEM. The precipitation of nanoparticles was related to strain recovery and grain growth, as both reduced the solubility of solute atoms in the matrix. The in situ TEM observation results provide direct experimental evidence for the dissolution–precipitation mechanism in nickel-based MA powders.

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Acknowledgements

This study was granted by the R&D Program of Korea Atomic Energy Research Institute (KAERI). H.N. Han was supported by the National Research Foundation of Korea (NRF) granted by the Korea government (MSIT) (No. NRF-2015R1A5A1037627).

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Correspondence to Jinsung Jang.

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Wang, M., Han, H.N., Chung, HS. et al. Microstructural Evolution of Oxide and Nitride Dispersed Nickel-Based Alloy Powders. Met. Mater. Int. 25, 140–146 (2019). https://doi.org/10.1007/s12540-018-0176-6

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  • DOI: https://doi.org/10.1007/s12540-018-0176-6

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