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

doi:10.1016/S0263-4368(98)00005-5

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 journal › Article › peer-review

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 language	English
Pages (from-to)	127-132
Number of pages	6
Journal	International Journal of Refractory Metals and Hard Materials
Volume	16
Issue number	2
DOIs	https://doi.org/10.1016/S0263-4368(98)00005-5
Publication status	Published - 1998

ASJC Scopus subject areas

Ceramics and Composites
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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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 journal › Article › peer-review

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title = "Nitriding of dilute Mo-Ti alloys at a low temperature of 1373 K",

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.",

author = "Masahiro Nagae and Shigetoshi Okada and Makoto Nakanishi and Jun Takada and Yutaka Hiraoka and Yoshito Takemoto and Moritaka Hida and Hideyuki Kuwahara and Yoo, {Myoun Ki}",

note = "Funding Information: Fruitful discussions with Dr Y. Tomii and T. Unezaki are highly appreciated. The authors are thankful to M. Kobayashi and A. Kunisada for their help in the experiments. We are greatly indebted to Tokyo Tungsten Co. Ltd for supplying molybdenum-titanium alloys and for the chemical analysis of the specimens. This study was partly supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture and also by the Japan Securities Scholarship Foundation.",

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AU - Nagae, Masahiro

AU - Okada, Shigetoshi

AU - Nakanishi, Makoto

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AU - Hiraoka, Yutaka

AU - Takemoto, Yoshito

AU - Hida, Moritaka

AU - Kuwahara, Hideyuki

AU - Yoo, Myoun Ki

N1 - Funding Information: Fruitful discussions with Dr Y. Tomii and T. Unezaki are highly appreciated. The authors are thankful to M. Kobayashi and A. Kunisada for their help in the experiments. We are greatly indebted to Tokyo Tungsten Co. Ltd for supplying molybdenum-titanium alloys and for the chemical analysis of the specimens. This study was partly supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture and also by the Japan Securities Scholarship Foundation.

PY - 1998

Y1 - 1998

N2 - 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.

AB - 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.

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

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