Study of crack resistance of TiAlN coatings by scratch testing

Шугуров, А. Р.; Akulinkin, A. A.; Панин, А. В.; Сергеев, В. П.; Калашников, М. П.; Voronov, A. V.; Cheng, Chin‐Hsiang

doi:10.1134/s1029959917020084

Cited by 20 publications

(3 citation statements)

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“…Recently, increasing attention has been paid to nitride coatings with multilayer architecture due to their high mechanical and tribological characteristics [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. The multilayer architecture of the obtained coatings makes it possible to influence the structural-phase state of the layers by changing the modulation period of alternating layers, and, in addition, allows for combining their individual properties [ 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Bilayer Thickness and Bias Potential on the Structure and Properties of (TiZr/Nb)N Multilayer Coatings as a Result of Arc-PVD Deposition

et al. 2022

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This work is devoted to the study of the formation of nanostructured multilayer coatings (TiZr/Nb)N on the surface of an AISI 321 steel substrate depending on the deposition parameters of the Arc-PVD method. The results of the X-ray diffraction analysis showed the formation of solid solution (TiNb)N and ZrN in the multilayer coatings with an FCC structure, ε-NbN with a hexagonal structure, as well as with a small volume fraction of the ε-Ti2N and β-Nb2N phase. On the basis of phase composition data, it is possible to assume that an increase in the number of bilayers leads to a decrease in the nitrogen concentration in the bilayers and, consequently, to a decrease in the volume fraction of ε-NbN and β-Nb2N nitrides. In all investigated systems obtained at −100 V and −200 V bias potentials, ε-NbN is the main phase. The study of the element distribution over the thickness of the (TiZr/Nb)N coating confirms the results of the X-ray diffraction analysis. The use of the structure model in the form of alternating layers allows for significantly improving the adhesion characteristics of the protective coating, as well as ensuring their high hardness. Based on the experimental results, it is possible to analyze changes in the mechanical and tribological properties of multilayer coatings depending on the number of applied bilayers. The results of the study of the elastic modulus and hardness of multilayer coatings (TiZrNb)N with different numbers of bilayers showed that a large number of bilayers (small thickness of each individual layer) shows the lowest value of hardness. It is assumed that as the bilayer thickness decreases, the coating characteristics are closer to the monolayer alloy than to the multilayer structure.

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Section: Introductionmentioning

confidence: 99%

Effect of Bilayer Thickness and Bias Potential on the Structure and Properties of (TiZr/Nb)N Multilayer Coatings as a Result of Arc-PVD Deposition

et al. 2022

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“…Addition of Ta to Ti 1−x Al x N is beneficial for its toughness enhancement with retaining the hardness [38,39]. The contact loading of the samples was carried out by scratch testing, which is commonly used to evaluate crack resistance and load-bearing capacity of coatings as well as their adhesion strength to the substrates [40,41]. The in-plane straining was performed by tensile testing of the coated substrates, which was extensively utilized to study the cracking behavior of brittle coatings on ductile substrates [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Multilayer Architecture and Ta Alloying on the Mechanical Performance of Ti-Al-N Coatings under Scratching and Uniaxial Tension

Шугуров

Kuzminov

2021

Metals

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The present work is focused on a comparative study of the effect of Ti-Al interlayers and Ta alloying on the mechanical behavior of Ti1−xAlxN coatings under normal contact pressure and in-plane straining. The contact loading of the samples was carried out by scratch testing, while the in-plane tensile straining was performed by uniaxial tension of the coated steel substrates. The Ti0.45Al0.55N and Ti0.43Al0.45Ta0.12N monolithic coatings as well as the Ti0.45Al0.55N/Ti0.45Al0.55 multilayer coatings with different number and thickness of the layers were deposited by DC magnetron sputtering. It was found that the introduction of the ductile Ti0.45Al0.55 layers into the Ti0.45Al0.55N coating and alloying with Ta led to their significant toughening. The improved toughness of the Ti0.43Al0.45Ta0.12N coating coupled with high residual compressive stress and high hardness resulted in its strongest resistance to cracking under scratching and tensile straining among the coatings studied. The multilayer coating with the thickest metal layers exhibited the improved resistance to delamination under in-plane straining.

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“…Repetitive scratches are required to confirm the scratch failure or uniformity with enough separation between the scratch marks to avoid interaction.During the scratch test, the coating material experiences both tensile and compressive stress due to the compression of the material under the indenter and bending around the indenterspecimen contact area as seen inFigure 7below[37,38]. The bending generates both compression and tensile stresses in different areas.…”

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confidence: 99%

UQ eSpace

Ojeda¹,

Fabián²

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Ti-6Al-4V is widely used in aerospace, aeronautical and military applications due to its excellent mechanical properties, especially its high strength to weight ratio and corrosion resistance. Nevertheless, poor wear and oxidation resistance has limited the utilization of this material in broader applications. This is why hard ceramic coatings are typically applied to the surface of Ti alloy with the purpose to improve its tribological properties. Characterizing the fracture strength of the coatings layers becomes critical as it determines the lifetime and structural integrity of the protective coating in service. In this project, fracture strength characterization of two typical TiO2 coatings on Ti-6Al-4V alloy produced by laser cladding process was carried out. This was achieved by using a combination of focused ion beam (FIB) milling, nanoindentation and finite element analysis (FEA) techniques. Firstly, the Ti-6Al-4V substrates were coated with a layer of titanium oxide, using laser scanning speed of 300mm/s, and laser power of 100W and 150W. The metallurgical cross-sections of the coatings were then examined using an optical microscope to characterize the microstructure of the solidified oxide coating. A FEI SCIOS FIB Dual Beam system was then used to manufacture the micro-scale cantilevers on the coatings and nanoindentation tests were performed to bend the microcantilever beams to failure. The critical load and deflection were recorded. At last, FEA models were created to simulate the bending behaviour of the microcantilevers during the bending test. And the maximum tensile stresses generated as the cantilevers failed were then used as the fracture strength. This methodology allowed us to conclude that all the cantilevers failed in a brittle fashion. Also, both SEM images and FEA simulations agree that fracture was initiated close to the base given that the highest stresses were identified in this area. The mean fracture strengths of the coating materials were 7.79 and 7.68 GPa, respectively. A through error analysis was conducted. It was concluded that the accuracy of this methodology was affected by the following factors: • Manufactured cantilevers had some curvature and the cross-sections were not completely symmetric. However, the microcantilevers were modelled flat and symmetric in order to simplify the model. • Measuring the actual dimensions of the cantilever beams was challenging due to its rounded edges. IV | P a g e Henry RAMIREZ MECH4501-Engineering Thesis ACKNOWLEDGEMENTS This thesis project would have been impossible without the aid and support of my supervisor, Dr. Mingyuan Lu. For always having willingness to help me during the execution of this project, for her patience, enthusiasm, motivation and vast knowledge. I cannot imagine having a better mentor and supervisor than her. Besides my advisor, I would like to express my sincere gratitude to the lecturers from all the subjects I took during my studies at UQ. In special to Prof. Hal Gurgenci, Prof. Ross McAree, Dr. Jeff Gates and Prof. Kaz...

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Study of crack resistance of TiAlN coatings by scratch testing

Cited by 20 publications

References 22 publications

Effect of Bilayer Thickness and Bias Potential on the Structure and Properties of (TiZr/Nb)N Multilayer Coatings as a Result of Arc-PVD Deposition

Effect of Bilayer Thickness and Bias Potential on the Structure and Properties of (TiZr/Nb)N Multilayer Coatings as a Result of Arc-PVD Deposition

The Effect of Multilayer Architecture and Ta Alloying on the Mechanical Performance of Ti-Al-N Coatings under Scratching and Uniaxial Tension

UQ eSpace

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