Mo-Ti合金の内部窒化

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タイトル別名
  • Internal Nitriding of Mo-Ti Alloys
  • Mo Ti ゴウキン ノ ナイブ チッカ

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Molybdenum alloys containing up to 5.48 wt%Ti were studied after nitriding in a purified nitrogen (0.1 MPa) at 1573∼1773 K. The obtained results disagreed with those reported by some worker, because the latter appeared to be affected by a small amount of oxygen in nitrogen.<BR>Hardness of nitrided layer increased, with increasing titanium content and decreasing treatment temperature, to the maximum value of 800 VPN. Electron microscopy and electron and X-ray diffraction revealed three kinds of nitrides; namely, ribbon-shaped equilibrium TiN, disk-shaped metastable TiN which appeared to replace the G.P.zone, and non-equilibrium nitride with an unknown structure. At temperatures below 1673 K, preferential precipitation beneath nitriding front was observed on dislocations created to release the lattice expansion due to nitriding. This region affected layer thicknesses and hardness profiles. At 1773 K, the nitriding kinetics obeyed the parabolic law predicted by Wagner’s theory, but below 1673 K it was not the case. The latter departure was explained by the preferential precipitation region formed in front of the layer and non-equilibrium nitride precipitation.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 43 (7), 658-664, 1979

    公益社団法人 日本金属学会

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