Hardness evaluation, stoichiometry and grain size of titanium nitride films obtained with plasma nitriding on Ti-6Al-4V samples

Vasconcellos, M.A.Z.; Lima, Saulo Cordeiro; Hinrichs, Ruth

doi:10.1590/s1517-70762010000200030

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…The XRD analysis that was performed on the plasma-nitrided sample is presented in Figure 8. The analysis confirmed the presence of the face-centered cubic δ-TiN (JCPDS file 38-1420) and the tetragonal ε-Ti2N (JCPDS file 17-0386) [19,22,39,41,42]. Also, the α-Ti phase was present, which was the same one that was found in the as-received sample.…”

Section: Microstructural Characterizationsupporting

confidence: 58%

“…The XRD analysis performed on the as-received sample is presented in Figure 7. The diffraction pattern was fitted with α-Ti (JCPDS file 44-1294) and the β-Ti (JCPDS file 44-1288) phases, the same as was identified by other authors [19,22,25,39,40]. The XRD analysis that was performed on the plasma-nitrided sample is presented in Figure 8.…”

Section: Microstructural Characterizationmentioning

confidence: 93%

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Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy

Almeida

Couto

Reis

et al. 2018

Metals

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This work aimed to enhance the creep resistance of Ti-6Al-4V alloy treated by plasma nitriding. The nitriding was performed on specimens with a Widmanstätten microstructure for four hours at 690 °C under a gas atmosphere containing Ar:N2:H2 (0.455:0.455:0.090). X-ray diffraction analysis showed that the ε-Ti2N and δ-TiN formed on the nitrided sample, in addition to the α-Ti and β-Ti matrix phases. The layer thickness of this sample was about 1 µm. Hot tensile tests were performed in the temperature range of 500 to 700 °C on nitrided and non-nitrided samples, which indicated an increased strength of the nitrided samples. The same temperature range was used for the creep tests in a stress range of 125 to 319 MPa. The plasma-nitrided samples exhibited better creep resistance when compared to the untreated samples. This result was demonstrated by the decreased secondary creep rate and the increased final creep time. This improvement in the creep resistance appeared to be associated with the formation of the nitrided layer, which worked as a barrier to oxygen diffusion into the material and due to the formation of a surface residual compressive stress.

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Section: Microstructural Characterizationsupporting

confidence: 58%

Section: Microstructural Characterizationmentioning

confidence: 93%

Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy

Almeida

Couto

Reis

et al. 2018

Metals

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“…Zhang, Ohmura, Emura, Sekido, Yin, Min and Tauzaki reported on the nanoindentation hardness of ultra-fine grain aluminum [302] which study may be contrasted in terms of hardness level and importance of the H-P grain size dependence with results reported on nanopolycrystalline diamond by Sumiya and Irifume [303] and by Gao [304]. And for a relatively hard material, smaller grain size association with greater hardness was reported in an evaluation of titanium nitride films produced by plasma nitriding on the surface of Ti-6Al-4V material [305]. Figure 29 shows combination of ISE, H-P and specimen size aspects in an important investigation of nanoindentation measurements obtained by Bull, Sanderson and Oila on submicrometer copper thin film materials [306].…”

Section: Polycrystal/polyphase Plasticitymentioning

confidence: 93%

Elastic, Plastic, Cracking Aspects of the Hardness of Materials

Armstrong

Elban

Walley

2013

Int. J. Mod. Phys. B

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The hardness properties of materials are tracked from early history until the present time. Emphasis is placed on the hardness test being a useful probe for determining the local elastic, plastic and cracking properties of single crystal, polycrystalline, polyphase or amorphous materials. Beginning from connection made between individual hardness pressure measurements and the conventional stress–strain properties of polycrystalline materials, the newer consideration is described of directly specifying a hardness-type stress–strain relationship based on a continuous loading curve, particularly, as obtained with a spherical indenter. Such effort has received impetus from order-of-magnitude improvements in load and displacement measuring capabilities that are demonstrated for nanoindentation testing. Details of metrology assessments involved in various types of hardness tests are reviewed. A compilation of measurements is presented for the separate aspects of Hertzian elastic, dislocation-mechanics-based plasticity and indentation-fracture-mechanics-based cracking behaviors of materials, including elastic and plastic deformation rate effects. A number of test applications are reviewed, most notably involving the hardness of thin film materials and coatings.

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“…[3][4][5] The mechanical properties of Ti6Al4V are also highlighted, due to its a þ b structure, being better in orthopaedic applications than commercially pure titanium. 6,7 Even with all these outstanding advantages, Ti6Al4V still has problems with low shear strength, low wear resistance, 6,8,9 releases of aluminium and vanadium ions, 10,11 and hydrophobic surface -which is a major problem in osseointegration. 7 All things considered, Ti6Al4V major problems in orthopaedics are surface-related.…”

Section: Introductionmentioning

confidence: 99%

“…Even with all these outstanding advantages, Ti6Al4V still has problems with low shear strength, low wear resistance, 6,8,9 releases of aluminium and vanadium ions, 10,11 and hydrophobic surface - which is a major problem in osseointegration. 7 All things considered, Ti6Al4V major problems in orthopaedics are surface-related.…”

Section: Introductionmentioning

confidence: 99%

Hollow cathode plasma nitriding of medical grade Ti6Al4V: A comprehensive study

et al. 2020

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Ti6Al4V used in biomedical applications still has several surface-related problems, such as poor bone compatibility and low wear resistance. In this work, the formation of a protective layer of titanium nitride obtained by plasma treatment in hollow cathode was studied, and the best experimental conditions were verified by a statistical factorial design of experiments. The samples were characterized in terms of their physical and chemical properties, correlating the effects of time (min) and temperature (°C). An achieved ideal condition was further analysed in terms of in vitro cytotoxicity, micro-abrasion, and electrochemical properties. The carried-out assessment has shown that nitrided condition has an improvement in wettability, microhardness, along with TixNy formation and roughness increment, when compared to pristine condition.

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Hardness evaluation, stoichiometry and grain size of titanium nitride films obtained with plasma nitriding on Ti-6Al-4V samples

Cited by 6 publications

References 7 publications

Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy

Effect of Plasma Nitriding on the Creep and Tensile Properties of the Ti-6Al-4V Alloy

Elastic, Plastic, Cracking Aspects of the Hardness of Materials

Hollow cathode plasma nitriding of medical grade Ti6Al4V: A comprehensive study

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