メカニカルアロイング法によるFe-TiNナノ結晶複合粉末の作製と衝撃固化成形

概要

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Fe100-xTix (X= 25, 50, 75 at.%) powder mixtures were milled in vibrational ball mill under N2 atmosphere, and the milled powders were dynamically compacted by using a propellant gun. It was found that Fe-Ti milled powders were consisted of α-iron and TiN phases. These powders had nanostructures with grain sizes of about 4-7 nm in diameter. By dynamically compacting the Fe50(TiN)50 powder at the shock pressures of 38.6 GPa and above, a nanocomposite material having an extremely high hardness (Hv-1300) was obtained. When the material was annealed at 1073 K for 5 h, the grain growth occurred to about 20 nm for α-iron phase, and the hardness was increased to a maximum value (Hv-1600). With increasing annealing temperature above 1173 K, the grain growth occurred and the hardness drastically decreased.