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

被引：0

作者：

Xu, Rong-Guang ^{[1
]}

Xiang, Yuan ^{[1
]}

Zhang, Gunan ^{[1
]}

Rao, Qi ^{[1
]}

Leng, Yongsheng ^{[1
]}

机构：

[1] George Washington Univ, Dept Mech & Aerosp Engn, Washington, DC 20052 USA

来源：

MATERIALS | 2022年 / 15卷 / 03期

基金：

美国国家科学基金会;

关键词：

lubrication; nanotribology; Frank dislocation; phase transition; molecular dynamics; STICK-SLIP; SOLIDIFICATION; REASSESSMENT; PLASTICITY; FLUIDIZE;

D O I：

10.3390/ma15030997

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

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.

引用

页数：10