Anisotropic Phase Transformation Mechanism on Coarse-Grained and Fine-Grained Pure Titanium at Low-Temperature Plasma Nitriding

Author:

Abstract

The nitriding process of the coarse-grained and fine-grained pure titanium proceeded by multidirectional forging technique has been investigated at temperatures of 623, 673, and 723 K. The process was carried out by high-density radiofrequency-direct current plasma combined with a rectangular hollow cathode device. The result obtained is a significant increase in surface hardness with increasing holding temperature. The surface hardness increases due to forming a surface layer composed of δ-Ti2N, ε-Ti2N and TixNx observed from x-ray diffraction results. This paper explains the mechanism of surface layer formation. We also observed anisotropic phase transformation of titanium nitride through the right shift of the x-ray diffraction peaks. Diffused nitrogen atoms during the nitriding process cause a change in crystal orientation through structural transformation of the metastable δ-Ti2N to the stable ε-Ti2N. The structural reconstruction will continue by forming TixNx to achieve stoichiometric equilibrium. More compacting of the surface microstructure is also obtained by increasing nitriding temperature.

Publisher

National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)

Subject

Metals and Alloys,Surfaces, Coatings and Films,Fluid Flow and Transfer Processes,Condensed Matter Physics,Materials Science (miscellaneous),Electronic, Optical and Magnetic Materials

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. THE GAS IMPURITIES INFLUENCE ON THE CHARACTERISTICS OF VT1-0 AND VT6 TITANIUM ALLOYS;Problems of Atomic Science and Technology;2023-10-12

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