Preparation of dense TiN1 ? X (X = 0–0.4) by pulsed electric current sintering: Densification and mechanical behavior |
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| Affiliation: | 1. Department of Materials Engineering, Faculty of Engineering, Malayer University, Malayer 65719-95863, Iran;2. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran 16846-13114, Iran;1. TU Bergakademie Freiberg, Institute of Materials Engineering, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany;2. TU Bergakademie Freiberg, Institute of Materials Science, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany;1. Materials Physics Research Institute, School of Physics, University of the Witwatersrand, Wits, Johannesburg 2050, South Africa;2. DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Wits, Johannesburg 2050, South Africa;3. Institute for Chemical Technologies and Analytics, Vienna University of Technology, Vienna, Austria |
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| Abstract: | Bulks of TiN1 ? X in the range of X = 0–0.4 with high density were prepared by a new method which comprises the reaction between TiN with TiH2 through pulsed electric current sintering. X-ray diffractograms revealed that single fcc phase with nitrogen vacancies was achieved after sintering; further observation by scanning electron microscopy showed homogeneous structure in all samples and larger grain size by increasing the amount of TiH2. The maximum Vickers hardness measured on the samples was approximately 31 GPa at X = 0.3. An increase in hardness was observed in non-stoichiometric samples even its larger grain size. The grain size-indent diagonal ratio was calculated from 1.2 at X = 0 to 5.6 at X = 0.4. The addition of TiH2 showed an improvement in both densification and hardness without significant degradation of fracture toughness. Based on these results, the mechanical properties of TiN1 ? X bulks can be controlled as a function of TiH2/TiN ratios in order to be used for different applications. |
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