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Korean Journal of Metals and Materials > Volume 55(2); 2017 > Article
Korean Journal of Metals and Materials 2017;55(2): 91-97. doi: https://doi.org/10.3365/KJMM.2017.55.2.91
Fe-(20, 45) wt% Gd 금속간 화합물의 기계적 특성 및 부식 거동 연구
강보경1, 백열1, 최용1,*, 문병문2
1단국대학교 신소재공학과
2한국생산기술연구원 액상 공정 및 용해 주조 연구실
Study on the Mechanical Properties and Corrosion Behaviors of Fe-(20, 45) wt% Gd Intermetallics
Bo Kyeong Kang1, Youl Baik1, Yong Choi1,*, Byung Moon Moon2
1Dankook University, Department of Materials Science and Engineering, Chungnam 31116, Republic of Korea
2Liquid Processing and Casting Technology R&D Group, Korea Institute of Industrial Technology, Incheon 21999, Republic of Korea
Correspondence  Yong Choi ,Tel: +82-41-550-3537, Email: yochoi@dankook.ac.kr
Received: 11 April 2016;  Accepted: 29 August 2016.  Published online: 2 February 2017.
ABSTRACT
Fe-(20, 45 wt%) Gd intermetallics were vacuum arc melted as the mother alloy of a neutron shielding and absorbing material. The structure of the cast Fe-20 wt% Gd intermetallics had primary dendrites with a short width of about 2 μm, which became coarse with increasing Gd content. The final compositions of the Fe-20 wt% Gd and Fe-45 wt% Gd intermetallics determined by Rietveld refinement were mainly Fe3Gd with 26.6 at% Fe2Gd, and Fe3Gd with various intermetallics like 13.9 at% Fe2Gd, 7.3 at% Fe9Gd and 3.9 at% Fe17Gd2, respectively. The micro-hardnesses, yield strength, ultimate compressive strength and elongation of the Fe-20 wt% Gd intermetallics were 629±12 Hv, 753 MPa, 785 MPa and 4%, respectively, and those of the Fe-45 wt% Gd intermetallics were 741±13 Hv, 772 MPa, 823 MPa and 3%. Passivity was not present in artificial sea water at room temperature. The corrosion potentials and the corrosion rates of the Fe-20 wt% Gd and Fe-45 wt% Gd intermetallics were –624 mVSHE, 2.771 mA/cm2, and –804 mVSHE, 3.397 mA/cm2, respectively. The corroded surface of the Fe-Gd intermetallics contained corrosion products like gadolinium with iron, which detached to leave a trail of pits.
Keywords: gadolinium, gd intermetallics, rietveld refinement, mechanical properties, corrosion behaviors
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