Nucleation of Frank Dislocation during the Squeeze-Out Process in Boundary Lubrication: A Molecular Dynamics Study

Materials

Rong-Guang Xu¹  Yuan Xiang¹  Qi Rao¹  Yongsheng Leng¹  Gunan Zhang¹ 

[1] Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, DC 20052, USA;

关键词: lubrication;    nanotribology;    Frank dislocation;    phase transition;    molecular dynamics;   

DOI  :  10.3390/ma15030997

来源: DOAJ

【 摘 要 】

Liquid–vapor molecular dynamics (LVMD) simulations are performed to reinvestigate the phase transition and solvation force oscillation behavior of a simple argon liquid film confined between two solid surfaces. Our simulations present a novel scenario in which the n → n − 1 layering transitions are accompanied by the formation, climb, and annihilation of Frank partial dislocations during the squeeze-out process under compression. This is indicated by the splitting of the repulsive peaks in the solvation force profile. The detailed analysis reveals that the formation–climb–annihilation mechanism of Frank dislocation occurs during approach and disappears during receding, which would result in force hysteresis. In combination with our recent works, this study provides new insights into the physical property of nanoconfined lubricant films in boundary lubrication.

【 授权许可】

Unknown