Application of a Dynamic-Nanoindentation Method to Analyze the Local Structure of an Fe-18 at.% Gd Cast Alloy

Nuclear Engineering and Technology

Youl Baik¹  Yong Choi¹  Byung M. Moon²  Dong-Seong Sohn³ 

[1] Department of Materials Science and Technology, Dankook University, 119 Dandae-ro, Dongnam-gu, Cheonan, Chungnam 31116, South Korea;Liquid Processing and Casting Technology R and D Group, KITECH, 156 Gaetbeol-ro, Yeonsu-gu, Incheon, 21999, South Korea;Nuclear Engineering Department, UNIST, 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 689-798, South Korea;

关键词: Fe-Gd Cast Alloy;    Nano-indentation;    Neutron-absorbing Materials;   

DOI  :  10.1016/j.net.2016.10.002

来源: DOAJ

【 摘 要 】

A dynamic nanoindentation method was applied to study an Fe-18 at.% Gd alloy as a neutron-absorbing material prepared by vacuum arc-melting and cast in a mold. The Fe-18 at.% Gd cast alloy had a microstructure with matrix phases and an Fe-rich primary dendrite of Fe9Gd. Rietveld refinement of the X-ray spectra showed that the Fe-18 at.% Gd cast alloy consisted of 35.84 at.% Fe3Gd, 6.58 at.% Fe5Gd, 16.22 at.% Fe9Gd, 1.87 at.% Fe2Gd, and 39.49 at.% β-Fe17Gd2. The average nanohardness of the primary dendrite phase and the matrix phases were 8.7 GPa and 9.3 GPa, respectively. The fatigue limit of the matrix phase was approximately 37% higher than that of the primary dendrite phase. The dynamic nanoindentation method is useful for identifying local phases and for analyzing local mechanical properties.

【 授权许可】

Unknown