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Microstructural Evolution of Oxide and Nitride Dispersed Nickel-Based Alloy Powders
Ist Teil von
Metals and Materials International, 2019, 25(1), , pp.140-146
Ort / Verlag
Seoul: The Korean Institute of Metals and Materials
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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 Si
3
N
4
and Er
2
O
3
exhibited different behaviors. The added Si
3
N
4
particles were not dissolved during the MA process, resulting in faster strain recovery and grain coarsening in the MA powders. In contrast, the Er
2
O
3
particles were dissolved into the matrix during the MA process. Also, precipitation of Er
2
Ti
2
O
7
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.