Nitriding of dilute Mo-Ti alloys at a low temperature of 1373 K

Masahiro Nagae, Shigetoshi Okada, Makoto Nakanishi, Jun Takada, Yutaka Hiraoka, Yoshito Takemoto, Moritaka Hida, Hideyuki Kuwahara, Myoun Ki Yoo

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

For Mo-0.5 mass% Ti and pure Mo alloy nitrided in a NH3 gas at a relatively low temperature of 1373 K, microstructural observations through optical and transmission electron microscopes, X-ray diffraction analysis and hardness measurements were carried out. A surface nitriding layer with very high hardness of approximately Hv ∼ 1800 consisted of two Mo-nitride regions: an outer one of γ-Mo2N and an inner one of β-Mo2N. The inward diffusion of nitrogen is a rate-controlling process in the growth of the surface nitriding layer. In Mo-Ti alloy additionally an internal nitriding layer with relatively high hardness of Hv ∼ 800 was formed beneath the surface nitriding layer. Such high hardness in the internal nitriding layer was found to result from the uniform dispersion of extremely fine plate-like particles of titanium nitride. The particles are approximately 0.4 nm thick and have coherent strain field in the matrix.

Original languageEnglish
Pages (from-to)127-132
Number of pages6
JournalInternational Journal of Refractory Metals and Hard Materials
Volume16
Issue number2
Publication statusPublished - 1998

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Nitriding
Hardness
Temperature
Titanium nitride
Nitrides
X ray diffraction analysis
Electron microscopes
Nitrogen
Gases

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Nitriding of dilute Mo-Ti alloys at a low temperature of 1373 K. / Nagae, Masahiro; Okada, Shigetoshi; Nakanishi, Makoto; Takada, Jun; Hiraoka, Yutaka; Takemoto, Yoshito; Hida, Moritaka; Kuwahara, Hideyuki; Yoo, Myoun Ki.

In: International Journal of Refractory Metals and Hard Materials, Vol. 16, No. 2, 1998, p. 127-132.

Research output: Contribution to journalArticle

Nagae, M, Okada, S, Nakanishi, M, Takada, J, Hiraoka, Y, Takemoto, Y, Hida, M, Kuwahara, H & Yoo, MK 1998, 'Nitriding of dilute Mo-Ti alloys at a low temperature of 1373 K', International Journal of Refractory Metals and Hard Materials, vol. 16, no. 2, pp. 127-132.
Nagae, Masahiro ; Okada, Shigetoshi ; Nakanishi, Makoto ; Takada, Jun ; Hiraoka, Yutaka ; Takemoto, Yoshito ; Hida, Moritaka ; Kuwahara, Hideyuki ; Yoo, Myoun Ki. / Nitriding of dilute Mo-Ti alloys at a low temperature of 1373 K. In: International Journal of Refractory Metals and Hard Materials. 1998 ; Vol. 16, No. 2. pp. 127-132.
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AU - Hida, Moritaka

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