Study of Nanoscale Wear of SiC/Al Nanocomposites Using Molecular Dynamics Simulations

Yin, Zhihua; Zhu, Pengzhe; Li, Baozhen

doi:10.1007/s11249-021-01414-0

Cited by 49 publications

(16 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6H-SiC is characterized by high hardness, high stiffness, and a high forbidden band width and is widely used in high-temperature, high-radiation aerospace and high-voltage, high-magnetic-field optoelectronic integration as well as biomedical applications . Conventional grinding methods can no longer meet the requirements of nanoscale machining and efficient and high precision of atomic-level 6H-SiC materials with the development of the ultra-precision manufacturing technology. The ultra-precision machining technology , is one of the effective methods to achieve non-destructive machining.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Analysis of 6H-SiC Subsurface Damage by Nanofriction

Zhang

Feng

et al. 2022

ACS Omega

View full text Add to dashboard Cite

To investigate the subsurface damage of 6H-SiC nanofriction, this paper uses molecular dynamics analysis to analyze the loading process of friction 6H-SiC surfaces, thus providing an in-depth analysis of the formation mechanism of subsurface damage from microscopic crystal structure deformation characteristics. This paper constructs a diamond friction 6H-SiC nanomodel, combining the radial distribution function, dislocation extraction method, and diamond identification method with experimental analysis to verify the dislocation evolution process, stress distribution, and crack extension to investigate the subsurface damage mechanism. During the friction process, the kinetic and potential energies as well as the temperature of the 6H-SiC workpiece basically tend to rise, accompanied by the generation of dislocated lumps and cracks on the sides of the 6H-SiC workpiece. The stresses generated by friction during the plastic deformation phase lead to dislocations in the vicinity of the diamond tip friction, and the process of dislocation nucleation expansion is accompanied by energy exchange. Dislocation formation is found to be the basis for crack generation, and cracks and peeled blocks constitute the subsurface damage of 6H-SiC workpieces by diamond identification methods. Friction experiments validate microscopic crystal changes against macroscopic crack generation, which complements the analysis of the damage mechanism of the simulated 6H-sic nanofriction subsurface.

show abstract

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Analysis of 6H-SiC Subsurface Damage by Nanofriction

Zhang

Feng

et al. 2022

ACS Omega

View full text Add to dashboard Cite

show abstract

“…It is essential to state that in Figure 6, higher loads result in lower friction coefficients for both materials below 350°C, however, the findings are inverted above 400°C and 500°C, when the higher load results in a higher coefficient of friction. Under 350°C, the drop in friction coefficient under high load can be attributable to the applied load-induced surface work hardening effect (Yin et al , 2021). As illustrated in Figures 5 and 6, when the temperature is less than 300°C, the friction coefficient increases slowly and the fluctuation is small, but when the temperature is over 300°C, the friction coefficient increases sharply and the fluctuation becomes more intense.…”

Section: Resultsmentioning

confidence: 99%

Effects of different temperatures and loads on the tribological behavior of foamed iron-reinforced SiCp/A359 composites

Liu

He²,

Liu³

et al. 2022

ILT

View full text Add to dashboard Cite

Purpose To improve the high-temperature wear properties of the SiCp/A359 composite, foamed iron-reinforced SiCp/A359 composite (A359–SiCp/Fe) is prepared. The purpose of this study is to investigate the tribological behavior and mechanism of the A359–SiCp/Fe composites at different temperatures (100–500 °C) and loads (7 N, 10 N and 12 N). Design/methodology/approach The A359–SiCp/Fe composite was fabricated by vacuum-assisted infiltration. The dry sliding tribological behaviors of A359–SiCp/Fe composite were investigated using the ball-on-disc-type tribometer. The worn surface and wear morphology of the longitudinal section were examined using field emission scanning electron microscopy and metallographic microscope. Findings The critical transition temperature for severe wear in A359–SiCp/Fe composite was 50–100 °C higher than in SiCp/A359 composite. Foamed iron prevents exfoliation cracks from penetrating deeper into the matrix. The friction coefficient stability of the A359–SiCp/Fe composite was higher than the unreinforced composite at elevated temperatures. With the increase in temperature, the friction-affected layer was severely worn, and the wear mechanism transferred from abrasion and delamination to oxidation and plastic flow, respectively. Originality/value The preparation procedure for aluminum matrix composites reinforced with foamed metal has been less reported, and the research on the tribological behavior and mechanism of A359–SiCp/Fe composite at various temperatures is insufficient. The foamed iron structure considerably enhances the wear properties of SiCp/A359 composite in elevated temperature conditions.

show abstract

“…Apile trans and Apile norm represent the transverse and normal contact areas between the abrasive and material pile-up, respectively Fig. 10 The surface topography at the rotational speeds of a -100 rad/ns, b -50 rad/ns, c -25 rad/ns, d -10 rad/ns, e 0 rad/ ns, f 10 rad/ns, g 25 rad/ns, h 50 rad/ns and i 100 rad/ns, respectively [63]. Therefore, the joint efforts of the variations of contact areas and thermal softening effect lead to the evolution of polishing forces with the rotational speed.…”

Section: The Effect Of Rotational Speedmentioning

confidence: 99%

Atomic Simulations of Deformation Mechanism of 3C-SiC Polishing Process with a Rolling Abrasive

Yin

Zhu

et al. 2021

Tribol Lett

Self Cite

View full text Add to dashboard Cite

In the present study, molecular dynamics (MD) simulations are applied to investigate the polishing process of cubic silicon carbide (3C-SiC) with a rotating abrasive. The influence of abrasive rotational speed and rotation axis orientation on the friction characteristics and deformation behaviors of 3C-SiC is studied. The results show that as the rotational speed increases, the normal force first increases until it reaches its maximum at 25 rad/ns and then decreases. The evolution of transverse force with the rotational speed is more complicated and the smallest transverse force and friction coefficient are obtained at the rotational speed of 50 rad/ns. Besides, the transverse force increases while the normal force decreases with the rotation angle when the angular velocity vector of the rotational abrasive is parallel to the substrate surface. The case when the rotational speed is 25 rad/ns and the rotation angle is 0 is a significant critical situation. At the critical situation, we observe the lowest material removal rate, the deepest subsurface damage layer, the biggest high stress region and the smallest high temperature region for all rotational speeds and rotation axis orientations. Moreover, in the simulations, phase transformation (mainly amorphization) induced by high pressure is more pronounced than that by thermal effect. The results gained can shed light on the atomic-scale material removal and deformation mechanisms of 3C-SiC during polishing process.

show abstract

Study of Nanoscale Wear of SiC/Al Nanocomposites Using Molecular Dynamics Simulations

Cited by 49 publications

References 48 publications

Molecular Dynamics Analysis of 6H-SiC Subsurface Damage by Nanofriction

Molecular Dynamics Analysis of 6H-SiC Subsurface Damage by Nanofriction

Effects of different temperatures and loads on the tribological behavior of foamed iron-reinforced SiCp/A359 composites

Atomic Simulations of Deformation Mechanism of 3C-SiC Polishing Process with a Rolling Abrasive

Contact Info

Product

Resources

About