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Korean Journal of Metals and Materials > Volume 55(5); 2017 > Article
Korean Journal of Metals and Materials 2017;55(5): 357-362. doi: https://doi.org/10.3365/KJMM.2017.55.5.357
Fe-5Y2O3 조성의 기계적 합금화 분말에 형성된 산화물의 상변태 거동
김가언1,2, 최정선1, 노상훈1, 강석훈1, 최병권1, 김영도2, 김태규1
1한국원자력연구원 원자력소재개발부
2한양대학교 신소재공학과
Phase Transformation Behavior of Oxide Particles Formed in Mechanically Alloyed Fe-5Y2O3 Powder
Ga Eon Kim1,2, Jung-Sun Choi1, Sanghoon Noh1, Suk Hoon Kang1, Byoung Kwon Choi1, Young Do Kim2, Tae Kyu Kim1
1Nuclear Materials Development Division, Korea Atomic Energy Research Institute, Deajeon 34057, Republic of Korea
2Department of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
Correspondence  Tae Kyu Kim ,Tel: +82-42-868-8384, Email: tkkim2@kaeri.re.kr
Received: 1 September 2016;  Accepted: 19 October 2016.  Published online: 9 May 2017.
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.
Keywords: ODS(Oxide Dispersion Strengthened), mechanical alloying, nano-sized oxide particle, phase transformation, YαFeβOγ-type phase
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