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 |
| Publication status | Published - 1998 |
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ASJC Scopus subject areas
- Metals and Alloys
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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
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TY - JOUR
T1 - Nitriding of dilute Mo-Ti alloys at a low temperature of 1373 K
AU - Nagae, Masahiro
AU - Okada, Shigetoshi
AU - Nakanishi, Makoto
AU - Takada, Jun
AU - Hiraoka, Yutaka
AU - Takemoto, Yoshito
AU - Hida, Moritaka
AU - Kuwahara, Hideyuki
AU - Yoo, Myoun Ki
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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UR - http://www.scopus.com/inward/citedby.url?scp=0031644723&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0031644723
VL - 16
SP - 127
EP - 132
JO - International Journal of Refractory Metals and Hard Materials
JF - International Journal of Refractory Metals and Hard Materials
SN - 0958-0611
IS - 2
ER -