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201-006
                  Nano-clustering of interstitial and substitutional solute atoms in iron
                  Numakura, H.(1);
                  (1) OPU;
                  Presenter: Hiroshi Numakura (OPU)
                  Keyword: iron, steel, Snoek relaxation, single crystals
                  Abstract:
                  The microstructure and mechanical properties of steels are governed by C and N, the
                  elements that dissolve interstitially in iron. Substitutional alloying elements modify the
                  properties of steels, some of them directly by themselves, but others indirectly through
                  their  effects  on  the  behaviour  of  the  light  interstitial  solute  species.  The  interaction
                  between  the  unlike  solute  species  is  a  well-known  phenomenon  [1],  but  quantitative
                  knowledge has come to be available only recently for a limited number of systems [2].
                  Attractive interaction between the i and s solute atoms gives rise to formation of solute-
                  atom clusters, and they develop to nano-precipitates of alloy carbides and nitrides, which
                  can be useful ingredients of high strength steels [3]. We are systematically investigating
                  interaction  of  important  alloying  elements  in  steels  with  solute  C  and  N  by
                  thermochemical solubility measurements and mechanical spectrometry [2]. The latter is
                  to study characteristic influences of the alloying element on the Snoek relaxation of C
                  and N. We present how one can obtain detailed information - the interaction energy and
                  the geometrical configuration - of the solute-atom clusters by mechanical spectrometry
                  using very dilute alloys and their single crystals. [1] Numakura H., Koiwa M., M3D:
                  Mechanics and Mechanisms of Material Damping, ASTM STP 1304, A. Wolfenden, V.
                  K. Kinra (eds.), American Society for Testing and Materials, 1997, pp. 383-393. [2] H.
                  Numakura, Arch. Metall. Mater. 60 (2015), 2061-2068. [3] G. Miyamoto, Y. Tomio, H.
                  Aota, K. Oh-ishi, K. Hono, T. Furuhara, Mater. Sci. Tech. 27 (2011), 742-746.






































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