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 at.% Fe3Gd, at.% Fe5Gd, at.% Fe9Gd, at.% Fe2Gd, and at.% b-Fe17Gd2. The average nanohardness of the primary dendrite phase and the matrix phases were GPa and GPa, respectively. | Application of a dynamic-nanoindentation method to analyze the local structure of an Fe-18 at.% Gd cast alloy N u c l e a r E n g i n e e r i n g a n d T e c h n o l o g y 4 9 ( 2 0 1 7 ) 5 7 6 e5 8 0 Available online at ScienceDirect Nuclear Engineering and Technology journal homepage: Original Article Application of a Dynamic-Nanoindentation Method to Analyze the Local Structure of an Fe-18 at.% Gd Cast Alloy Yong Choi a, Youl Baik a, Byung M. Moon b, and Dong-Seong Sohn c,* a Department of Materials Science and Technology, Dankook University, 119 Dandae-ro, Dongnam-gu, Cheonan, Chungnam 31116, South Korea b Liquid Processing and Casting Technology R and D Group, KITECH, 156 Gaetbeol-ro, Yeonsu-gu, Incheon, 21999, South Korea c Nuclear Engineering Department, UNIST, 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 689-798, South Korea article info abstract Article history: A dynamic nanoindentation method was applied to study an Fe-18 at.% Gd alloy as a Received 11 February 2016 neutron-absorbing material prepared by vacuum arc-melting and cast in a mold. The Fe-18 Received in revised form at.% Gd cast alloy had a microstructure with matrix phases and an Fe-rich primary 3 September 2016 dendrite of Fe9Gd. Rietveld refinement of the X-ray spectra showed that the Fe-18 at.% Gd Accepted 3 October 2016 cast alloy consisted of at.% Fe3Gd, at.% Fe5Gd, at.% Fe9Gd, at.% Fe2Gd, Available online 24 October 2016 and at.% b-Fe17Gd2. The average nanohardness of the primary dendrite phase and the matrix phases were GPa and GPa, respectively. The fatigue limit of the matrix phase Keywords: was approximately 37% higher than that of the primary dendrite phase. The dynamic Fe-Gd Cast Alloy nanoindentation method is useful for identifying local phases and for analyzing local Nano-indentation mechanical properties. Neutron-absorbing Materials Copyright © 2016, .
