Nano-clustering of interstitial and substitutional solute atoms in iron

Reference Speaker Authors
Hiroshi Numakura Numakura, H.(Osaka Prefecture University); 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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