Molecular Dynamics Study on Friction Mechanism of Aluminum Alloy at Different Temperatures
Frictional wear occurs in contact with the die during aluminum alloy forming,which directly affects the part forming quality and die life.In this paper,the temperature dependence of the friction mechanism of aluminum alloy is stud-ied at the atomic level by using molecular dynamics method,and the changes of mechanical properties,friction coefficient,surface morphology and internal structure in the friction process of aluminum alloy are analyzed at different temperatures.The results show that the deformation resistance of aluminum alloys is increased with decreasing temperature,and the fric-tion coefficient at 600K is 7％lower than that at 83 K.With increasing temperature,the degree of plastic deformation of alu-minum alloys and the number of deformation atoms are increased.Within aluminum alloys,the number of defective atoms and the range of dislocation movement due to deformation show a positive correlation with temperature.Therefore,high tem-perature is beneficial to reduce the friction of aluminum alloy forming,while low temperature is beneficial to reduce wear and improve the quality of parts forming by improving the deformation resistance of aluminum alloy.
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维普
