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Metals and Materials International

, Volume 25, Issue 1, pp 140–146 | Cite as

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

  • Man Wang
  • Heung Nam Han
  • Hee-Suk Chung
  • Young-Bum Chun
  • Jinsung JangEmail author
Article
  • 130 Downloads

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.

Keywords

Nickel alloy Oxide dispersion strengthening Mechanical alloying In situ TEM Precipitation 

Notes

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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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  • Man Wang
    • 1
    • 2
  • Heung Nam Han
    • 2
  • Hee-Suk Chung
    • 3
  • Young-Bum Chun
    • 1
  • Jinsung Jang
    • 1
    Email author
  1. 1.Advanced Materials Development TeamKorea Atomic Energy Research InstituteDaejeonRepublic of Korea
  2. 2.Department of Materials Science and Engineering and Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea
  3. 3.Jeonju CenterKorea Basic Science InstituteJeonjuRepublic of Korea

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