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Microstructure formation in the TbFe8.22Si1.45 alloy

  • Structure, Phase Transformations, and Diffusion
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Abstract

Electron microscopy and electron diffraction were used to study the microstructure formation upon annealing of the TbFe8.22Si1.45 alloy at 1000°C, when the high-temperature h-Tb2(Fe, Si)17 phase (Th2Ni17 type) is decomposed to the r-Tb2(Fe, Si)17 (Th2Zn17 type), Tb3(Fe, Si)29, and Tb4(Fe, Si)41 or Tb(Fe, Si)12 phases. It has been established that the annealed alloy has a very complex microstructure. One of the phases, Tb(Fe, Si)12, has an acicular morphology, which consist of alternating plates in which the [001] axes of the tetragonal lattices are turned relative to each other. Presumably, the formation of the needle-shaped phase begins from the growing-in of the Tb(Fe, Si)12 phase, which is formed around grains of the high-temperature h-Tb2(Fe, Si)17 phase upon the ingot solidification, into the matrix grains. The spacings between these needles in the annealed alloy are occupied by a mixture of the r-Tb2(Fe, Si)17, Tb3(Fe, Si)29, and Tb4(Fe, Si)41 phases. Each phase has several different orientations, in which the axes of the crystal lattices are turned relative to each other. The size of the phases does not exceed 25 nm. Such a complex microstructure leads to the minimization of stresses caused by the difference in the lattice parameters. Therefore, this microstructure is very stable, and the alloy does not reach the equilibrium state even after long-term (up to 960 h) high-temperature annealing.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620041, Russia

    G. V. Ivanova, N. N. Shchegoleva & G. M. Makarova

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  1. G. V. Ivanova
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  2. N. N. Shchegoleva
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  3. G. M. Makarova
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Original Russian Text © G.V. Ivanova, N.N. Shchegoleva, G.M. Makarova, 2006, published in Fizika Metallov i Metallovedenie, 2006, Vol. 102, No. 3, pp. 301–309.

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Ivanova, G.V., Shchegoleva, N.N. & Makarova, G.M. Microstructure formation in the TbFe8.22Si1.45 alloy. Phys. Metals Metallogr. 102, 279–287 (2006). https://doi.org/10.1134/S0031918X06090079

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  • DOI: https://doi.org/10.1134/S0031918X06090079

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