Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Experimental Verification of the Decomposition of Y2O3 in Fe-Based ODS Alloys During Mechanical Alloying Process

  • Byun, Jong Min (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Park, Chun Woong (Division of Materials Science and Engineering, Hanyang University) ;
  • Kim, Young Do (Division of Materials Science and Engineering, Hanyang University)
  • Received : 2018.04.14
  • Accepted : 2018.04.29
  • Published : 2018.11.20
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Abstract

In this study, we investigated the state of $Y_2O_3$, as a major additive element in Fe-based ODS alloys, during mechanical alloying (MA) processes by thermodynamic approaches and experimental verification. For this purpose, we introduced $Ti_2O_3$ that formed different reaction products depending on the state of $Y_2O_3$ into the Fe-based ODS alloys. In addition, the reaction products of $Ti_2O_3$, Y, and $Y_2O_3$ powders were predicted approximately based on their formation enthalpy. The experimental results relating to the formation of Y-based complex oxides revealed that $YTiO_3$ and $Y_2Ti_2O_7$ were formed when $Ti_2O_3$ reacted with Y; in contrast, only $Y_2Ti_2O_7$ was detected during the reaction between $Ti_2O_3$ and $Y_2O_3$. In the alloy of $Fe-Cr-Y_2O_3$ with $Ti_2O_3$, $YTiO_3$ (formed by the reaction of $Ti_2O_3$ with Y) was detected after the MA and heat treatment processes were complete, even though $Y_2O_3$ was present in the system. Using these results, it was proved that $Y_2O_3$ decomposed into monoatomic Y and O during the MA process.

Keywords

Acknowledgement

Grant : Development of 980°C grade superalloys strengthened by multi-component nano-oxides for commercialization of core materials in the field of the defense industry

Supported by : Ministry of Trade, Industry and Energy, National Research Foundation of Korea (NRF)

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