Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Application of a Dynamic-Nanoindentation Method to Analyze the Local Structure of an Fe-18 at.% Gd Cast Alloy

  • Choi, Yong (Department of Materials Science and Technology, Dankook University) ;
  • Baik, Youl (Department of Materials Science and Technology, Dankook University) ;
  • Moon, Byung M. (Liquid Processing and Casting Technology R and D Group, KITECH) ;
  • Sohn, Dong-Seong (Nuclear Engineering Department, UNIST)
  • Received : 2016.02.11
  • Accepted : 2016.10.03
  • Published : 2017.06.25
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Abstract

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 $Fe_9Gd$. Rietveld refinement of the X-ray spectra showed that the Fe-18 at.% Gd cast alloy consisted of 35.84 at.% $Fe_3Gd$, 6.58 at.% $Fe_5Gd$, 16.22 at.% $Fe_9Gd$, 1.87 at.% $Fe_2Gd$, and 39.49 at.% ${\beta}-Fe_{17}Gd_2$. 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.

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References

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