Mo-Ti合金のアンモニアガスと窒素ガス中での窒化挙動の比較 Comparison of Nitriding Behavior of Mo-Ti Alloys in NH_3 and N_2 Gases

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For dilute Mo-Ti alloys and pure Mo nitrided at 1100°C for 16h in NH<SUB>3</SUB> and N<SUB>2</SUB> gases, microstructural observations through optical and transmission electron microscopes, X-ray diffraction analysis and hardness measurements were carried out and the nitriding behavior in N<SUB>2</SUB> and NH<SUB>35</SUB> gases was compared. A surface layer of γ-Mo<SUB>2</SUB>N with Hv-1700 was formed for the nitriding in NH<SUB>3</SUB> gas of 1 atm. In contrast, the surface layer was absent for nitriding in N<SUB>2</SUB> gas at pressures below 10 atm, whereas the β-Mo<SUB>2</SUB>N layer was formed at a pressure of 15 atm. In an internal nitriding layer formed beneath the surface layer of Mo-Ti alloys nitrided in NH<SUB>3</SUB> gas, extremely small and plate-like particles of 2-4nm in width and approximately 0.45nm in thickness were clearly found to precipitate on {100} planes of the matrix. Furthermore, a large coherent strain field was observed in the matrix around each Ti-nitride precipitate. Such a dispersion of the small precipitates resulted in remarkable hardening in the nitrided alloy. The hardness of the internal nitriding layer of the alloys nitrided in NH<SUB>3</SUB> gas was much higher than that in N<SUB>2</SUB> gas. The difference in hardness can be explained in terms of the differences not only in size of the Ti-nitride precipitates but also in their distribution density.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(2), 189-194, 1998-02-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002015133
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4413747
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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