| Autor: |
Grigoreva, T. F., Kiseleva, T. Yu., Kovaleva, S. A., Zholudev, S. I., Vosmerikov, S. V., Devyatkina, E. T., Grigorev, V. D., Lyakhov, N. Z. |
| Zdroj: |
Russian Metallurgy (Metally); Dec2021, Vol. 2021 Issue 13, p1433-1440, 8p |
| Abstrakt: |
The products of mechanochemical synthesis and subsequent sintering of the Fe–20 wt % Ga system are studied by X-ray diffraction, electron diffraction, Mössbauer spectroscopy, and transmission, scanning and optical microscopy. After mechanical activation for 2 min in planetary ball mill AGO-2, about 70% of Fe is preserved and the FeGa3 intermetallic compound appears. Sintering of the resulting Fe/FeGa3 mechanocomposite takes place with the participation of a liquid phase. In the compacted material, the crystallite size of iron halves and the level of microstraines decreases fivefold. A structure with grain sizes of 3–8 μm forms and the microhardness is 360 HV. A sharp change in the phase composition of the mechanocomposite is observed after mechanical activation for 60 min: the FeGa3 phase disappears, an Fe(Ga) solid solution with a high gallium content appears, and about 50% of Fe is retained. After mechanical activation for 120 min, a Fe3Ga/Fe(Ga)/Fe mechanocomposite forms (grain sizes are 4–6 μm, microhardness is ~780 HV), sintering of which proceeds according to a solid-phase mechanism. The sintered materials are ferromagnetic. For the materials sintered from precursors after activation for 2 and 120 min, the coercive force is 35 and 77 Oe, respectively, the saturation magnetization is Msat = 162 and 131 A m2 kg–1, and the residual magnetization is Mres = 2.8 and 2.1 A m2 kg–1. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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