Phase composition and mechanical properties of Cu–Ti alloys synthesized in the surface layer of copper by plasma impact on the Ti/Cu system

Cherenda, N.N.; Basalai, A. V.; Углов, В.В.; Ласковнев, А. П.; Astashynski, V. M.; Kuzmitski, A. M.

doi:10.1016/j.vacuum.2019.06.033

Cited by 11 publications

(3 citation statements)

References 33 publications

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“…The concentration of copper decreased with the growth of the energy density absorbed by surface layer, that is associated with the erosion of the surface layer under plasma exposure and increase of the molten layer thickness (Cherenda et. al., 2015, Cherenda et. al., 2019.…”

Section: Resultsmentioning

confidence: 99%

THE FORMATION OF SURFACE Ti-Al-V-Cu ALLOY BY COMBINED ION-PLASMA TREATMENT

et al. 2022

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In this work surface Ti-Cu-Al-V alloy was synthesized by compression plasma flows impact on Ti-6Al-4V titanium alloy preliminary coated by copper. The treatment of Cu/ Ti-6Al-4V samples was carried out by three pulses of compression plasma flows generated in the nitrogen atmosphere (energy density absorbed by the surface was varied in the range of 26 -43 J/cm 2 per pulse). The phase and elemental composition, structure, microhardness and friction coefficient of the formed surface alloy were investigated. It has been established that plasma treatment resulted in the formation of α-Ti solid solution containing alloying elements in the surface layer and δ-TiN on the surface. Increase of the energy absorbed by the surface during plasma impact led to decrease of Cu concentration (2.7-0.5 at.%) in the analyzed layer. The surface alloy was characterized by a uniform distribution of Ti, Al, and V atoms in contrast to the distribution of these elements on the surface of the untreated Ti-6Al-4V alloy. The microhardness increase up to 4.7 GPa (1.3 times higher in comparison with initial Ti-6Al-4V alloy) was found after compression plasma flows treatment at 43 J/cm 2 . Tribological tests showed that the minimal friction coefficient (0.13) was observed after treatment at the absorbed energy density of 26 J/cm 2 .

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Section: Resultsmentioning

confidence: 99%

THE FORMATION OF SURFACE Ti-Al-V-Cu ALLOY BY COMBINED ION-PLASMA TREATMENT

et al. 2022

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“…The change of mechanical and physical properties is attributed to the increase of intermolecular distance caused by thermal expansion, which leads to the increase of viscosity and the adhesion friction coefficient of titanium alloys. It has also been reported that high temperatures promote the diffusion of oxygen atoms, leading to the oxidation of Ti and Cu atoms in the metal [ 23 ]. TiO 2 oxide is also a kind of hard phase which may aggravate abrasive wear.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Copper Content on the Mechanical and Tribological Properties of Hypo-, Hyper- and Eutectoid Ti-Cu Alloys

Jiang

Yang

et al. 2020

Materials

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Titanium alloys are widely used in aerospace, chemical, biomedical and other important fields due to outstanding properties. The mechanical behavior of Ti alloys depends on microstructural characteristics and type of alloying elements. The purpose of this study was to investigate the effects of different Cu contents (2.5 wt.%, 7 wt.% and 14 wt.%) on mechanical and frictional properties of titanium alloys. The properties of titanium alloy were characterized by tensile test, electron microscope, X-ray diffraction, differential scanning calorimetry, reciprocating friction and wear test. The results show that the intermediate phase that forms the eutectoid structure with α-Ti was identified as FCC Ti2Cu, and no primary β phase was formed. With the increase of Cu content, the Ti2Cu phase precipitation in the alloy increases. Ti2Cu particles with needle structure increase the dislocation pinning effect on grain boundary and improve the strength and hardness of titanium alloy. Thus, Ti-14Cu shows the lowest elongation, the best friction and wear resistance, which is caused by the existence of Ti2Cu phases. It has been proved that the mechanical and frictional properties of Ti-Cu alloys can be adjusted by changing the Cu content, so as to better meet its application in the medical field.

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“…CPF irradiation experiments were performed at distances of about 16, 12 and 8 cm, respectively. Based on experimental results and prior experience [12,40], energy densities of the above irradiation were estimated to be about 20, 50 and 80 J cm −2 , and the corresponding power densities were about 2, 5 and 8 GW m −2 . The evolution of temperature, stress and strain with time and space in tungsten and molybdenum during CPF irradiation was simulated by the finite element method using Abaqus software.…”

Section: Methods Of Experiments and Simulationmentioning

confidence: 96%

Experimental and simulation studies on damage mechanisms of tungsten and molybdenum under compressed plasma flow irradiation

Zhang

et al. 2023

Nucl. Fusion

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The failure mechanism of plasma-facing components (PFCs) under extreme plasma conditions relevant for fusion reactor were investigated. Here, edge-localized mode (ELM)-like transient thermal shock irradiation experiments were performed on tungsten and molybdenum using compressed plasma flow, and combined with thermal-mechanical analysis by means of finite element simulations to discuss the grain structure evolution, cracking behavior and variations of hardness. When ELM-like thermal shock irradiation was sufficient to melt tungsten and molybdenum, submicron-sized cellular sub-grain structure created on their surface due to the high temperature gradient of the molten layer under the effect of the Bénard-Marangoni instability. Rapid directional solidification from the bottom of the molten layer to the surface induced the formation of columnar grains dominated by <200> orientation. While the formation of cellular sub-grains increased hardness, the thermal effect of irradiation and the formation of columnar grains led to softening. The high thermal stress induced by the ELM-like thermal shock produced macro-cracks and micro-cracks on the surface of tungsten and only micro-cracks on the surface of molybdenum. Macro-cracks generated due to the intrinsic brittleness of tungsten. As a result of stress evolution, longitudinal macro-cracks extending perpendicular to the surface experienced transverse transformation within the material. Micro-cracks formed due to the embrittlement of the re-solidification zone, and their width increased with the melting depth. These results help to understand failure mechanisms in PFCs under extreme operation conditions which are valuable for developing future fusion reactors.

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Phase composition and mechanical properties of Cu–Ti alloys synthesized in the surface layer of copper by plasma impact on the Ti/Cu system

Cited by 11 publications

References 33 publications

THE FORMATION OF SURFACE Ti-Al-V-Cu ALLOY BY COMBINED ION-PLASMA TREATMENT

THE FORMATION OF SURFACE Ti-Al-V-Cu ALLOY BY COMBINED ION-PLASMA TREATMENT

The Effect of Copper Content on the Mechanical and Tribological Properties of Hypo-, Hyper- and Eutectoid Ti-Cu Alloys

Experimental and simulation studies on damage mechanisms of tungsten and molybdenum under compressed plasma flow irradiation

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