Influence of HCP/BCC interface orientation on the tribological behavior of Zr/Nb multilayer during nanoscratch: A combined experimental and atomistic study

AlMotasem, A.T.; Daghbouj, N.; Sen, H.S.; Mirzaei, Saeed; Callisti, M.; Polcar, Tomáš

doi:10.1016/j.actamat.2023.118832

Cited by 28 publications

(8 citation statements)

References 78 publications

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“…Thus, by analyzing the data on changes in the tribological and strength characteristics of the studied NbTiVZr alloys depending on the irradiation fluence and the amount of accumulated radiation damage, we can draw the following conclusion. Based on the fact that with the accumulation of radiation damage in the structure of the damaged layer, it swells, with a subsequent increase in volume, some of the formed defects are squeezed out to the surface, forming additional distortions in the form of swellings or microcracks [39]. At the same time, a change in the dislocation density due to size effects associated with a change in the orientation of the grains or their crushing, an increased content of dislocations is formed near the grain boundaries, which, under external influence (for example, friction), can lead to the emergence of metastable states capable of forming microcracks, the formation of which reduces crack resistance.…”

Section: Resultsmentioning

confidence: 99%

Study of the Radiation Damage Kinetics in NbTiVZr High-Entropy Alloys Irradiated by Heavy Ions

Kadyrzhanov

Kozlovskiy

Shlimas

et al. 2023

Metals

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The purpose of this paper was to study the kinetics of accumulation of radiation damage in the near-surface layer of a high-entropy NbTiVZr alloy upon irradiation with heavy Kr15+ ions and fluences of 1010–1015 ion/cm2. According to the data of X-ray diffraction analysis, it was found that irradiation with heavy ions lead to structural changes associated with the accumulation of deformation distortions and stresses. In this case, the nature of deformation distortions was associated with tensile distortions of the crystal lattice and swelling of the near-surface layer. An analysis of the strength properties of the irradiated samples showed that the accumulation of deformation distortions in the near-surface layer lead to a decrease in the resistance to cracking and destruction of the near-surface layer. In this case, the main changes occurred at fluences above 1013 ion/cm2, which are characterized by an excess of the threshold for overlapping defective regions that appear along the trajectory of incident ions. Tribological tests showed that an increase in defective inclusions in the structure of the near-surface layer lead to an increase in friction and a decrease in crack resistance.

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Section: Resultsmentioning

confidence: 99%

Study of the Radiation Damage Kinetics in NbTiVZr High-Entropy Alloys Irradiated by Heavy Ions

Kadyrzhanov

Kozlovskiy

Shlimas

et al. 2023

Metals

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“…The friction coefficients of the three composites remarkably changed with the increase in the test temperature, especially the lower friction coefficient at 800 • C, which was because oxidation played a key role in the tribological properties of the composites [23,24]. In addition, all curves contain some fluctuations along the scratch to some extent, which could be attributed to phase changes and grain orientation [25].…”

Section: Frictional Coefficientmentioning

confidence: 97%

Effects of Ni/MoS2, Ag and Cr2O3 on the Microstructure and Mechanical Performance of a CoCrFeNi High-Entropy Alloy over a Wide Temperature Range

Xu,

Liu,

Zhang

et al. 2023

Coatings

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In the field of aerospace, core components require excellent wear resistance, lubrication and mechanical properties over a wide temperature range. In this study, three groups of CoCrFeNi high-entropy alloy (HEA)-based self-lubricating composites were designed with the addition of Ag, Ni/MoS2 and Cr2O3 using discharge-plasma-sintering technology. Their microstructure, phase composition, mechanical properties, friction and wear properties were analyzed. The results showed that, with the addition of Ag, the hardness and yield stress of HEA-Ni/MoS2-Ag were reduced by 36 HV and 24 MPa, respectively, while the plastic strain was increased by 2%. With the addition of Cr2O3, the hardness (382 HV) and yield stress (430 MPa) of HEA-Ni/MoS2-Ag-Cr2O3 reached their highest values, but the plastic strain reached its lowest value. HEA-Ni/MoS2-Ag-Cr2O3 had the smallest friction coefficient in which the friction coefficient at 800 °C was only 0.42. Additionally, it had a small wear rate of 3.2 × 10−6 mm3/Nm over a wide temperature range. At lower temperatures, Ni/MoS2 and Ag were conducive to lubrication, and the wear resistance was improved by the presence of Cr2O3. At high temperatures, a nickel oxide phase and a variety of silver molybdate phases were formed via a tribochemical reaction, which was vital to the high-temperature tribological properties.

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“…The internal atomic structure phase transition of copper-nickel alloy can evaluate the integrity of the overall lattice structure of the workpiece. The common neighbor analysis module of the visualization software OVITO is used to statistically analyze the number of phase transition atoms [45]. The evolution of atomic structural phase transitions under different rake angles with a depth of 15 Å is shown in figure 6.…”

Section: 22mentioning

confidence: 99%

Study on the atomic removal behavior and damage formation mechanism of nano cutting copper–nickel alloy with diamond tool

He,

Gao,

Tang

et al. 2024

Modelling Simul. Mater. Sci. Eng.

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The effects of tool rake angle and cutting depth on cutting temperature, cutting force, friction coefficient of rake tool face, atomic accumulation of chip flow and removal, surface quality, sub-surface damage layer thickness, atomic stress, and dislocation evolution were studied by molecular dynamics simulations. The results showed that the cutting temperature was concentrated on the chip, and the chip was easy to flow out with the increase of the tool rake angle, which weakens the extrusion and shearing action of the workpiece, resulting in the gradual reduction of tangential force. The tool rake angle of 10° is beneficial to improve the surface/subsurface quality of the workpiece. The minimum root-mean-square roughness obtained was 0.73 Å. The atomic stress of the workpiece was mainly concentrated around the area of interaction with the tool, and the atoms on the finished surface underwent elastic recovery, so the atomic stress was not significant. The 1/6<112> (Shockley) dislocation density had always been in the leading position, and 1/6<112> (Shockley) dislocation was continuously synthesized and decomposed during the nano-cutting process. With the increase of cutting depth, the number of atoms removed increases rapidly, and the width of chip side flow increases, but the symmetry is weakened. The contour line map even shows deep wave valleys caused by the absence of atoms, which increases the surface roughness. Moreover, the area and depth of the atomic stress distribution in the subsurface layer increase, and the number of amorphous atoms and dislocation density increase.

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Influence of HCP/BCC interface orientation on the tribological behavior of Zr/Nb multilayer during nanoscratch: A combined experimental and atomistic study

Cited by 28 publications

References 78 publications

Study of the Radiation Damage Kinetics in NbTiVZr High-Entropy Alloys Irradiated by Heavy Ions

Study of the Radiation Damage Kinetics in NbTiVZr High-Entropy Alloys Irradiated by Heavy Ions

Effects of Ni/MoS2, Ag and Cr2O3 on the Microstructure and Mechanical Performance of a CoCrFeNi High-Entropy Alloy over a Wide Temperature Range

Study on the atomic removal behavior and damage formation mechanism of nano cutting copper–nickel alloy with diamond tool

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