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Vol.55, No.5, 357 ~ 363, 2017
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| Title |
| Phase Transformation Behavior of Oxide Particles Formed in Mechanically Alloyed Fe-5Y2O3 Powder |
| 김가언 Ga Eon Kim , 최정선 Jung-sun Choi , 노상훈 Sanghoon Noh , 강석훈 Suk Hoon Kang , 최병권 Byoung Kwon Choi , 김영도 Young Do Kim , 김태규 Tae Kyu Kim |
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| Abstract |
| The phase transformation behavior of the oxides formed in mechanically alloyed Fe-5Y2O3 powder is investigated. Non-stoichiometric Y-rich and Fe-rich oxides with sizes of less than 300 nm are observed in the mechanically alloyed powder. The diffusion and redistribution reactions of the elements in these oxides during heating of the powder above 800 ℃ were observed, and these reactions result in the formation of a Y3Fe5O12 phase after heating at 1050 ℃. Thus, it is considered that the Y2O3 powder and some Fe powder are formed from the non-stoichiometric Y-rich and Fe-rich oxides after the mechanical alloying process, and a considerable energy accumulated during the mechanical alloying process leads to a phase transformation of the Y-rich and Fe-rich oxides to YαFeβOγ-type phase during heating. (Received September 1, 2016; Received October 19, 2016) |
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| Key Words |
| ODS(Oxide Dispersion Strengthened), mechanical alloying, nano-sized oxide particle, phase transformation, YαFeβOγ-type phase |
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